render iteration

.gitignore

@@ -0,0 +1 @@
+/target

CLAUDE.md

@@ -81,14 +81,13 @@ As of December 2025, SDL3 Rust bindings are usable but still maturing:
 **Using wgpu instead of OpenGL:**
 - Modern GPU API abstraction (Vulkan/Metal/DX12/OpenGL backends)
 - Better cross-platform support
-- WGSL shader language (WebGPU Shading Language)
+- WESL shader language (WebGPU Shading Language)
 - Type-safe API with explicit resource management
 - Low-res framebuffer rendering with 3-bit RGB dithering (retro aesthetic)
 
 **Rendering Architecture:**
 - wgpu for 3D mesh rendering with custom shaders
 - Low-resolution framebuffer (160×120) upscaled to window size
-- Bayer 8×8 dithering for 3-bit RGB color (8 colors total)
 - Multiple rendering pipelines: standard meshes and terrain
 - Separate bind groups for different material types
 
@@ -141,7 +140,6 @@ SDL Events → InputState → player_input_system() → InputComponent → movem
 
 **wgpu Rendering System:**
 - Low-res framebuffer (160×120) renders to texture
-- Bayer 8×8 dithering reduces colors to 3-bit RGB (8 colors)
 - Final blit pass upscales framebuffer to window using nearest-neighbor sampling
 - Depth buffer for 3D rendering with proper occlusion
 
@@ -199,10 +197,10 @@ cargo fmt
 
 ## Shader Files
 
-WGSL shaders are stored in the `shaders/` directory:
-- `shaders/standard.wgsl` - Standard mesh rendering with directional lighting
-- `shaders/terrain.wgsl` - Terrain rendering with shadow mapping (no displacement)
-- `shaders/blit.wgsl` - Fullscreen blit for upscaling low-res framebuffer
+WESL shaders are stored in the `src/shaders/` directory:
+- `src/shaders/standard.wesl` - Standard mesh rendering with directional lighting
+- `src/shaders/terrain.wesl` - Terrain rendering with shadow mapping (no displacement)
+- `src/shaders/blit.wgsl` - Fullscreen blit for upscaling low-res framebuffer
 
 Shaders are loaded at runtime via `std::fs::read_to_string()`, allowing hot-reloading by restarting the application.
 
@@ -230,7 +228,7 @@ Shaders are loaded at runtime via `std::fs::read_to_string()`, allowing hot-relo
 
 **Rendering:**
 - `render.rs` - wgpu renderer, pipelines, bind groups, DrawCall execution
-- `shader.rs` - Standard mesh shader (WGSL) with diffuse+ambient lighting
+- `shader.rs` - Standard mesh shader (WESL) with diffuse+ambient lighting
 - `terrain.rs` - Terrain entity spawning, glTF loading, EXR heightmap → physics collider
 - `postprocess.rs` - Low-res framebuffer and blit shader for upscaling
 - `mesh.rs` - Vertex/Mesh structs, plane/cube mesh generation, glTF loading
@@ -578,86 +576,3 @@ Time::init(); // In main() before game loop
 let time = Time::get_time_elapsed(); // Anywhere in code
 ```
 
-## Current Implementation Status
-
-### Implemented Features
-
-**ECS Architecture:**
-- ✅ Full ECS conversion completed
-- ✅ Entity system with EntityManager (spawn/despawn/query)
-- ✅ Component storages (Transform, Mesh, Physics, Movement, Input, PlayerTag, StateMachine)
-- ✅ Systems pipeline (input → state machine → physics → physics sync → render)
-- ✅ No `Rc<RefCell<>>` - clean component ownership
-- ✅ Event bus integrated as complementary to systems
-
-**Core Rendering:**
-- ✅ wgpu renderer with Vulkan backend
-- ✅ Low-res framebuffer (160×120) with Bayer dithering
-- ✅ Multiple render pipelines (standard mesh + terrain)
-- ✅ Directional lighting with diffuse + ambient
-- ✅ Terrain rendering (glTF with baked heights, no shader displacement)
-- ✅ EXR heightmap loading for physics colliders
-- ✅ glTF mesh loading
-- ✅ render_system (ECS-based DrawCall generation)
-
-**Input System:**
-- ✅ Two-layer input pipeline (InputState → InputComponent)
-- ✅ player_input_system converts raw input to gameplay commands
-- ✅ SDL event handling in InputState
-- ✅ Per-entity InputComponent for controllable entities
-
-**Camera & Debug:**
-- ✅ 3D camera with rotation (yaw/pitch)
-- ✅ Noclip mode for development (in debug/noclip.rs)
-- ✅ Mouse look with relative mouse mode
-- ✅ Toggle with 'I' key, 'N' for noclip mode
-
-**Physics:**
-- ✅ rapier3d integration with PhysicsManager singleton
-- ✅ PhysicsComponent storage (rigidbody/collider handles)
-- ✅ physics_sync_system (syncs physics → transforms)
-- ✅ Physics step integrated into game loop
-- ⚠️ Ground detection not yet implemented
-- ⚠️ Movement physics not yet connected
-
-**State Machines:**
-- ✅ Generic StateMachine implementation
-- ✅ StateMachineStorage (ECS component)
-- ✅ state_machine_system updates all state machines
-- ✅ Transitions can query ECS components
-- ⚠️ Player state transitions not yet configured
-
-**Player:**
-- ✅ Player entity spawning function
-- ✅ Components: Transform, Mesh, Physics, Movement, Input, PlayerTag
-- ⚠️ Movement system not yet implemented
-- ⚠️ State machine not yet attached to player
-- ⚠️ Currently inactive (noclip camera used instead)
-
-**Movement Configuration:**
-- ✅ Horizontal movement config (Bezier acceleration curves)
-- ✅ Vertical movement config (jump mechanics)
-- ✅ MovementComponent storage
-- ⚠️ Movement system not yet implemented
-- ⚠️ Not yet integrated with physics
-
-### Not Yet Implemented
-
-- ❌ Movement system (apply InputComponent → physics velocities)
-- ❌ Ground detection and collision response
-- ❌ Player state machine configuration
-- ❌ Camera follow behavior (tracks player entity)
-- ❌ Snow deformation compute shaders
-- ❌ Debug UI system
-
-### Current Focus
-
-**ECS migration is complete!** The architecture is now fully entity-component-system based with clean separation of data and logic. The next steps are:
-
-1. Implement movement_system to apply InputComponent to physics
-2. Configure player state machine transitions
-3. Implement ground detection
-4. Add camera follow system
-5. Integrate snow deformation
-
-The noclip camera mode serves as the primary navigation method for testing. Press 'N' to toggle noclip mode.

Cargo.toml

@@ -11,10 +11,13 @@ glam = "0.30"
 anyhow = "1.0"
 rapier3d = "0.31"
 bytemuck = { version = "1.14", features = ["derive"] }
-gltf = "1.4"
-image = { version = "0.25", features = ["exr"] }
+gltf = { version = "1.4", features = ["KHR_lights_punctual", "extras"] }
+image = { version = "0.25", default-features = false, features = ["png"] }
 exr = "1.72"
-half = "2.4"
 kurbo = "0.11"
 nalgebra = { version = "0.34.1", features = ["convert-glam030"] }
 serde_json = "1.0"
+wesl = "0.2"
+
+[build-dependencies]
+wesl = "0.2"

QWEN.md

@@ -0,0 +1,351 @@
+# Snow Trail SDL Project
+
+## Model Usage Guide
+
+**When interacting with this codebase, I follow a step-by-step, concise approach:**
+
+1. **Start with exploration**: Read files to understand context before making changes
+2. **Build incrementally**: Make small, targeted changes and verify them
+3. **Test after changes**: Run `cargo check` and relevant tests
+4. **Keep explanations brief**: Code should speak for itself; comments only for complex logic
+5. **Follow existing patterns**: Mimic the style, structure, and conventions in the codebase
+
+**For task management**, I use the todo list to track multi-step work:
+- Mark tasks as `in_progress` when starting
+- Mark tasks as `completed` immediately after finishing
+- Add new tasks when scope expands
+- Never batch multiple completions
+
+## Project Overview
+
+This is a pure Rust game engine implementation (not a game yet) that serves as a migration from a Godot-based project. It's a 3D game using SDL3 for windowing/input, wgpu for rendering, rapier3d for physics, and features a low-res retro aesthetic with dithering.
+
+The project implements an ECS (Entity Component System) architecture without engine dependencies, providing core systems for rendering, physics, input handling, and entity management.
+
+### Key Technologies
+- **SDL3**: Windowing and input handling (latest stable bindings)
+- **wgpu**: Modern GPU API abstraction for rendering (Vulkan/Metal/DX12/OpenGL backends)
+- **rapier3d**: Fast 3D physics engine
+- **glam**: Fast vector/matrix math library
+- **gltf**: Loading 3D models in glTF format
+- **exr**: Loading EXR heightmap files for physics colliders
+- **kurbo**: Bezier curve evaluation for movement acceleration curves
+
+### Architecture: Pure ECS
+- **Entities**: Just IDs (`EntityHandle = u64`), managed by `EntityManager`
+- **Components**: Pure data structures stored in component storages (HashMap)
+- **Systems**: Functions that query entities with specific component combinations
+- **No Rc<RefCell<>>** - Clean ownership model with components as data in hashmaps
+- **Component Storages** owned by single `World` struct
+
+## Building and Running
+
+### Build Commands
+```bash
+cargo build
+cargo build --release
+cargo check
+cargo test
+cargo run
+cargo fmt
+```
+
+### Shader Compilation
+The project uses a custom shader compilation system via the `wesl` crate:
+- WGSL/WESL shaders are compiled at build time via `build.rs`
+- Shaders are loaded at runtime via `std::fs::read_to_string()`, allowing hot-reloading by restarting the application
+- Build artifact: `standard` shader package
+
+### Runtime Behavior
+- Window resolution: 800×600 (resizable)
+- Rendering resolution: Low-res framebuffer (160×120) upscaled to window
+- Target FPS: 60 FPS with fixed timestep physics (1/60s)
+- Default mode: Noclip camera active
+- Toggle modes: Press 'N' to toggle noclip/follow modes
+
+## Development Conventions
+
+### Code Style (from CLAUDE.md)
+- **NO inline comments unless ABSOLUTELY necessary** - Code must be self-documenting
+- **Doc comments (`///`)** only for public APIs and complex algorithms
+- **All `use` statements must be at the file level** (module top), not inside function bodies
+- **NO inline paths** - always add `use` statements at the top of files
+- **Formatting**: `brace_style = "AlwaysNextLine"`, `control_brace_style = "AlwaysNextLine"`
+
+### File Structure
+```
+src/
+├── main.rs              - SDL3 event loop, game loop orchestration, system execution order
+├── entity.rs            - EntityManager for entity lifecycle (spawn/despawn/query)
+├── world.rs             - World struct owning all component storages
+├── camera.rs            - 3D camera with rotation and follow behavior
+├── physics.rs           - PhysicsManager singleton (rapier3d world)
+├── player.rs            - Player entity spawning function
+├── terrain.rs           - Terrain entity spawning, glTF loading, EXR heightmap loading
+├── render.rs            - wgpu renderer, pipelines, bind groups, DrawCall execution
+├── postprocess.rs       - Low-res framebuffer and blit shader for upscaling
+├── mesh.rs              - Vertex/Mesh structs, plane/cube mesh generation, glTF loading
+├── shader.rs            - Standard mesh shader (WGSL) with diffuse+ambient lighting
+├── state.rs             - Generic StateMachine implementation
+├── event.rs             - Type-safe event bus (complementary to ECS)
+├── picking.rs           - Ray casting for mouse picking (unused currently)
+├── heightmap.rs         - EXR heightmap loading utilities
+├── draw.rs              - DrawManager (legacy, kept for compatibility)
+├── texture_loader.rs    - Texture loading utilities
+└── systems/             - ECS systems (input, state_machine, physics_sync, render, camera)
+    ├── input.rs
+    ├── state_machine.rs
+    ├── physics_sync.rs
+    ├── render.rs
+    ├── camera_follow.rs
+    ├── camera_input.rs
+    └── camera_noclip.rs
+├── components/          - ECS component definitions
+    ├── input.rs
+    ├── mesh.rs
+    ├── movement.rs
+    ├── physics.rs
+    ├── player_tag.rs
+    ├── jump.rs
+    ├── camera.rs
+    └── camera_follow.rs
+├── utility/             - Utility modules
+    ├── input.rs         - InputState (raw SDL input handling)
+    ├── time.rs          - Time singleton (game time tracking)
+    └── transform.rs     - Transform struct (position/rotation/scale data type)
+├── debug/               - Debug utilities
+    ├── noclip.rs        - Noclip camera controller
+    └── render_collider_debug.rs
+└── shaders/             - WGSL/WESL shader files
+    ├── shared.wesl      - Shared shader utilities
+    ├── standard.wesl    - Standard mesh rendering with directional lighting
+    ├── terrain.wesl     - Terrain rendering with shadow mapping
+    └── blit.wgsl        - Fullscreen blit for upscaling low-res framebuffer
+```
+
+### System Execution Order (main.rs game loop)
+1. **SDL Events → InputState**: Poll events, handle raw input
+2. **InputState → InputComponent**: `player_input_system()` converts raw input to gameplay commands
+3. **State Machine Update**: `state_machine_physics_system()` and `state_machine_system()`
+4. **Physics Simulation**: Fixed timestep physics step
+5. **Physics → Transforms**: `physics_sync_system()` syncs physics bodies to transforms
+6. **Rendering**: `render_system()` generates DrawCalls, renderer executes pipeline
+7. **Cleanup**: Clear just-pressed states
+
+### ECS Component Storages
+All storages are owned by the `World` struct:
+- `TransformStorage` - Position, rotation, scale
+- `MeshStorage` - Mesh data + render pipeline
+- `PhysicsStorage` - Rapier3d rigidbody/collider handles
+- `MovementStorage` - Movement config + state
+- `JumpStorage` - Jump mechanics state
+- `InputStorage` - Gameplay input commands
+- `PlayerTagStorage` - Marker for player entities
+- `StateMachineStorage` - Behavior state machines
+- `CameraStorage` - Camera components
+- `CameraFollowStorage` - Camera follow behavior
+
+### Input Handling (Two-Layer Pipeline)
+**Layer 1: Raw Input** (`utility/input.rs` - `InputState`):
+- Global singleton for SDL event handling
+- Tracks raw hardware state (W/A/S/D pressed, mouse delta, etc.)
+- Handles SDL events via `handle_event()` method
+
+**Layer 2: Gameplay Commands** (`components/input.rs` - `InputComponent`):
+- Per-entity ECS component
+- Stores processed gameplay commands (move_direction, jump_pressed)
+- Filled by `player_input_system()` which reads `InputState`
+
+**Input Flow**: SDL Events → InputState → InputComponent → Movement Systems
+
+**Current Controls**:
+- `W/A/S/D`: Movement
+- `Space`: Jump
+- `Shift`: Speed boost (noclip mode)
+- `I`: Toggle mouse capture
+- `Escape`: Quit game
+- `N`: Toggle noclip/follow mode
+- Mouse motion: Camera look (yaw/pitch)
+
+### Rendering Pipeline
+- **Low-res framebuffer** (160×120) renders to texture
+- **Bayer 8×8 dithering** reduces colors to 3-bit RGB (8 colors)
+- **Final blit pass** upscales framebuffer to window using nearest-neighbor sampling
+- **Depth buffer** for 3D rendering with proper occlusion
+- **Multiple render pipelines**: Standard mesh and terrain pipelines
+- **Directional lighting**: Diffuse + ambient (basic Phong model)
+
+### Terrain System
+- **glTF mesh** exported from Blender 5.0 with baked height values in vertices
+- **EXR heightmap** loaded for physics colliders (single-channel R32Float format)
+- **Heightfield collider** created directly from EXR data
+- **No runtime displacement** - vertices rendered directly
+- **Separate terrain pipeline** for terrain-specific rendering
+
+### Build System
+- **`build.rs`**: Custom build script using `wesl` crate
+- **Shader compilation**: `package::standard` → `standard` artifact
+- **No external dependencies** needed for shader compilation at build time
+
+### Dependencies Rationale
+- **sdl3**: Modern SDL3 bindings for future-proofing
+- **wgpu**: Modern GPU API with cross-platform support
+- **rapier3d**: Fast physics engine with good Rust integration
+- **gltf**: Standard 3D model format for asset pipeline
+- **exr**: High-dynamic-range heightmap loading for physics
+- **kurbo**: Bezier curves for smooth movement acceleration
+- **bytemuck**: Safe byte casting for GPU buffer uploads
+
+## Current Implementation Status
+
+### Implemented Features
+✅ Full ECS architecture (entities, components, systems)
+✅ SDL3 windowing and input handling
+✅ wgpu rendering with low-res framebuffer
+✅ Multiple render pipelines (standard mesh + terrain)
+✅ Bayer dithering for retro aesthetic
+✅ glTF mesh loading
+✅ EXR heightmap loading for physics
+✅ rapier3d physics integration
+✅ State machine system (generic implementation)
+✅ Event bus (complementary to ECS)
+✅ Camera system (free look + follow modes)
+✅ Noclip mode for development
+✅ Two-layer input pipeline
+
+### In Progress
+⚠️ Movement system (apply InputComponent → physics velocities)
+⚠️ Ground detection and collision response
+⚠️ Player state machine configuration (transitions not yet set up)
+⚠️ Camera follow behavior (partial implementation)
+⚠️ Snow deformation compute shaders
+⚠️ Debug UI system
+
+### Known Limitations
+- Player entity spawns but is inactive (noclip camera used for testing)
+- Movement physics not yet connected to input
+- Ground detection not implemented
+- State machine transitions not configured
+- Camera follow needs refinement
+
+## Content Creation Workflow
+
+### Blender 5.0 (blender/)
+- **Terrain modeling**: `terrain.blend`
+- **Player character**: `player_mesh.blend`
+- **Export formats**:
+  - glTF: `meshes/` for rendering (baked heights in vertices)
+  - EXR: `textures/` single-channel float heightmap for physics
+
+### GIMP (gimp/)
+- **Dither patterns**: `dither_patterns.xcf` (Bayer matrix patterns)
+
+### Export Process
+1. Model terrain in Blender 5.0
+2. Export as glTF with baked height values
+3. Export same terrain as EXR heightmap
+4. Both files represent same data (visual/physics sync guaranteed)
+
+## Future Development
+
+### Next Steps (from CLAUDE.md)
+1. Implement `movement_system` to apply `InputComponent` to physics velocities
+2. Configure player state machine transitions (idle → walking → jumping → falling)
+3. Implement ground detection (raycasting with QueryPipeline)
+4. Add camera follow system (tracks player entity)
+5. Integrate snow deformation compute shaders
+6. Implement debug UI system for parameter tweaking
+
+### Testing Strategy
+- Systems are pure functions (easy to test)
+- Create multiple `World` instances for isolation
+- Query patterns are predictable
+- State machine transitions are testable
+
+## Technical Notes
+
+### EXR Heightmap Loading (Physics Only)
+```rust
+use exr::prelude::{ReadChannels, ReadLayers};
+
+let builder = exr::Image::new("heightmap.exr")
+    .no_deep_data()
+    .largest_resolution_level()
+    .all_channels()
+    .all_layers()
+    .all_attributes();
+```
+
+### Component Storage Pattern
+```rust
+pub struct TransformStorage {
+    pub components: HashMap<EntityHandle, Transform>,
+}
+
+impl TransformStorage {
+    pub fn with_mut<F, R>(&mut self, entity: EntityHandle, f: F) -> Option<R>
+    where
+        F: FnOnce(&mut Transform) -> R,
+    {
+        self.components.get_mut(&entity).map(f)
+    }
+}
+```
+
+### State Machine Integration
+- TypeId-based state identification
+- Transitions as closures (can capture entity ID)
+- State callbacks receive `&mut World` for component access
+- Safe pattern: Remove → Update → Insert to avoid borrow conflicts
+
+### Event System (Complementary to ECS)
+- Handles irregular, one-time occurrences
+- Cross-system messaging without tight coupling
+- Global `add_listener()` and `emit()` functions
+- Example: FootstepEvent for snow deformation
+
+### Shader Hot-Reloading
+- Shaders loaded at runtime via `std::fs::read_to_string()`
+- Restart application to reload shaders
+- No recompilation needed
+
+## Quick Reference
+
+### Running the Project
+```bash
+cd /home/jonas/projects/snow_trail_sdl
+cargo run
+```
+
+### Building for Release
+```bash
+cargo build --release
+```
+
+### Formatting Code
+```bash
+cargo fmt
+```
+
+### Toggling Modes at Runtime
+- Press **N** to toggle between noclip and follow modes
+- Press **I** to toggle mouse capture
+- Press **Escape** to quit
+
+### Working with Shaders
+- Edit `.wesl` files in `src/shaders/`
+- Changes take effect on application restart
+- Build script compiles `package::standard` → `standard` artifact
+
+### Adding New Components
+1. Define component struct (pure data, no Rc<RefCell>)
+2. Add storage to `world.rs` (HashMap<EntityHandle, Component>)
+3. Add storage to `World` struct
+4. Update `World::despawn()` to clean up component
+5. Create systems that query and modify the component
+
+### Adding New Systems
+1. Add function in `systems/` directory
+2. Import at top of `main.rs`
+3. Add to system execution order in game loop
+4. Systems receive `&mut World` (or `&World` for read-only)

blender/scripts/README.md

@@ -0,0 +1,139 @@
+# Blender Export Scripts
+
+Python scripts for generating textures and heightmaps from Blender terrain meshes.
+
+## Prerequisites
+
+- Blender 5.0+
+- Terrain mesh object (default name: "TerrainPlane")
+
+## Scripts
+
+### generate_heightmap.py
+
+Bakes EXR heightmap from terrain mesh using Blender's render system.
+
+**Output:** `textures/terrain_heightmap.exr` (R32Float single-channel)
+
+**Usage:**
+```python
+# In Blender's Scripting workspace - just run the script!
+# It will automatically find TerrainPlane and bake to textures/terrain_heightmap.exr
+```
+
+**Or run from command line:**
+```bash
+blender terrain.blend --background --python scripts/generate_heightmap.py
+```
+
+**Custom parameters:**
+```python
+from generate_heightmap import bake_heightmap
+
+bake_heightmap(
+    terrain_obj=bpy.data.objects["TerrainPlane"],
+    resolution=1000,
+    output_path="path/to/output.exr"
+)
+```
+
+### generate_normal_map.py
+
+Generates normal map from terrain mesh for neighbor sampling in shaders.
+
+**Output:** `textures/terrain_normals.png` (RGB encoded normals)
+
+**Usage:**
+```python
+from generate_normal_map import save_normal_map
+
+save_normal_map(
+    output_path=project_root / "textures" / "terrain_normals.png",
+    resolution=1024,
+    blur_iterations=2,
+    terrain_name="TerrainPlane"
+)
+```
+
+### generate_flowmap.py
+
+Generates flowmap for water/snow flow effects.
+
+**Output:** `textures/terrain_flowmap.png`
+
+## Terrain Export Workflow
+
+1. **Model terrain in Blender 5.0**
+   - Create/sculpt terrain mesh
+   - Add modifiers (Subdivision, Displacement, etc.)
+   - Ensure terrain has UV mapping
+
+2. **Bake heightmap**
+   - Run `generate_heightmap.py` script
+   - Uses Blender's baking system (like baking a texture)
+   - Creates `textures/terrain_heightmap.exr`
+   - Automatically applies all modifiers
+
+3. **Export glTF with baked heights**
+   - Select terrain mesh
+   - File → Export → glTF 2.0
+   - Save as `meshes/terrain.gltf`
+   - Heights are baked in vertex positions
+
+4. **Both files in sync**
+   - glTF: rendering (vertices with baked heights)
+   - EXR: physics (rapier3d heightfield collider)
+   - Both from same source = guaranteed match
+
+## Resolution Guidelines
+
+- **Heightmap (EXR):** 512×512, 1000×1000, or 1024×1024
+  - Higher = more accurate collision
+  - Lower = faster loading
+  - Default: 1000×1000
+  - Uses Blender's render sampling (no gaps!)
+
+- **Normal Map:** 1024×1024 or 2048×2048
+  - For shader neighbor sampling
+  - Higher quality for detailed terrain
+
+## Customization
+
+Change parameters by editing the script or calling directly:
+
+```python
+from generate_heightmap import bake_heightmap
+
+bake_heightmap(
+    terrain_obj=bpy.data.objects["MyTerrain"],
+    resolution=1024,
+    output_path="custom/path.exr"
+)
+```
+
+## Output Files
+
+```
+project_root/
+├── meshes/
+│   └── terrain.gltf        # Mesh with baked heights (manual export)
+└── textures/
+    ├── terrain.exr         # Heightmap for physics (generated)
+    ├── terrain_normals.png # Normal map (generated)
+    └── terrain_flowmap.png # Flow map (generated)
+```
+
+## Troubleshooting
+
+**"Object not found":**
+- Ensure terrain object exists
+- Check object name matches parameter
+- Script will auto-detect objects with "terrain" or "plane" in name
+
+**"Mesh has no vertices":**
+- Apply all modifiers before running script
+- Check mesh is not empty
+
+**EXR export fails:**
+- Ensure Blender has EXR support enabled
+- Check output directory exists and is writable

blender/scripts/generate_heightmap.py

@@ -0,0 +1,135 @@
+import bpy
+from pathlib import Path
+
+
+def bake_heightmap(terrain_obj, resolution=1024, output_path=None):
+    """
+    Bake terrain heightmap using Blender's render/bake system.
+
+    Args:
+        terrain_obj: Terrain mesh object
+        resolution: Texture resolution (square)
+        output_path: Path to save EXR file
+    """
+
+    print(f"Baking heightmap for: {terrain_obj.name}")
+    print(f"Resolution: {resolution}×{resolution}")
+
+    # Ensure object has UV map
+    if not terrain_obj.data.uv_layers:
+        print("Adding UV map...")
+        terrain_obj.data.uv_layers.new(name="UVMap")
+
+    # Create new image for baking
+    bake_image = bpy.data.images.new(
+        name="Heightmap_Bake",
+        width=resolution,
+        height=resolution,
+        alpha=False,
+        float_buffer=True,
+        is_data=True
+    )
+
+    # Setup material for baking
+    if not terrain_obj.data.materials:
+        mat = bpy.data.materials.new(name="Heightmap_Material")
+        terrain_obj.data.materials.append(mat)
+    else:
+        mat = terrain_obj.data.materials[0]
+
+    mat.use_nodes = True
+    nodes = mat.node_tree.nodes
+    nodes.clear()
+
+    # Create nodes for height baking
+    # Geometry node to get position
+    geo_node = nodes.new(type='ShaderNodeNewGeometry')
+
+    # Separate XYZ to get Z (height)
+    separate_node = nodes.new(type='ShaderNodeSeparateXYZ')
+    mat.node_tree.links.new(geo_node.outputs['Position'], separate_node.inputs['Vector'])
+
+    # Emission shader to output height value
+    emission_node = nodes.new(type='ShaderNodeEmission')
+    mat.node_tree.links.new(separate_node.outputs['Z'], emission_node.inputs['Color'])
+
+    # Material output
+    output_node = nodes.new(type='ShaderNodeOutputMaterial')
+    mat.node_tree.links.new(emission_node.outputs['Emission'], output_node.inputs['Surface'])
+
+    # Add image texture node (required for baking target)
+    image_node = nodes.new(type='ShaderNodeTexImage')
+    image_node.image = bake_image
+    image_node.select = True
+    nodes.active = image_node
+
+    # Select object and set mode
+    bpy.context.view_layer.objects.active = terrain_obj
+    terrain_obj.select_set(True)
+
+    # Setup render settings for baking
+    bpy.context.scene.render.engine = 'CYCLES'
+    bpy.context.scene.cycles.samples = 1
+    bpy.context.scene.cycles.bake_type = 'EMIT'
+
+    print("Baking...")
+    bpy.ops.object.bake(type='EMIT', use_clear=True)
+
+    print("Bake complete!")
+
+    # Save as EXR
+    if output_path:
+        bake_image.filepath_raw = str(output_path)
+        bake_image.file_format = 'OPEN_EXR'
+        bake_image.use_half_precision = False
+
+        scene = bpy.context.scene
+        original_color_mode = scene.render.image_settings.color_mode
+        original_color_depth = scene.render.image_settings.color_depth
+
+        scene.render.image_settings.color_mode = 'BW'
+        scene.render.image_settings.color_depth = '32'
+
+        bake_image.save_render(str(output_path), scene=scene)
+
+        scene.render.image_settings.color_mode = original_color_mode
+        scene.render.image_settings.color_depth = original_color_depth
+
+        print(f"Saved to: {output_path}")
+
+    # Cleanup
+    bpy.data.images.remove(bake_image)
+
+    return True
+
+
+if __name__ == "__main__":
+    project_root = Path(bpy.data.filepath).parent.parent
+    output_path = project_root / "textures" / "terrain_heightmap.exr"
+
+    output_path.parent.mkdir(parents=True, exist_ok=True)
+
+    # Find terrain object
+    terrain_obj = bpy.data.objects.get("TerrainPlane")
+
+    if not terrain_obj:
+        print("'TerrainPlane' not found. Searching for terrain mesh...")
+        for obj in bpy.data.objects:
+            if obj.type == 'MESH' and ('terrain' in obj.name.lower() or 'plane' in obj.name.lower()):
+                terrain_obj = obj
+                print(f"Using: {obj.name}")
+                break
+
+    if not terrain_obj:
+        raise ValueError("No terrain object found!")
+
+    bake_heightmap(
+        terrain_obj=terrain_obj,
+        resolution=1000,
+        output_path=output_path
+    )
+
+    print("\n" + "="*60)
+    print("Heightmap baking complete!")
+    print(f"Output: {output_path}")
+    print("="*60)

blender/scripts/generate_snow_depth.py

@@ -0,0 +1,268 @@
+import bpy
+from pathlib import Path
+
+
+def find_snow_modifier(terrain_obj):
+    """
+    Find the Geometry Nodes modifier that contains snow_depth attribute.
+    Returns the modifier or None if not found.
+    """
+    for mod in terrain_obj.modifiers:
+        if mod.type == 'NODES' and mod.node_group:
+            # Check if this modifier's node tree has Store Named Attribute with "snow_depth"
+            for node in mod.node_group.nodes:
+                if node.type == 'STORE_NAMED_ATTRIBUTE':
+                    if hasattr(node, 'data_type') and node.name and 'snow' in node.name.lower():
+                        return mod
+                    # Check inputs for the name
+                    for input in node.inputs:
+                        if input.name == 'Name' and hasattr(input, 'default_value'):
+                            if input.default_value == 'snow_depth':
+                                return mod
+            # Fallback: check modifier name
+            if 'snow' in mod.name.lower():
+                return mod
+    return None
+
+
+def bake_snow_depth(terrain_obj, resolution=512, output_path=None, modifier_name=None):
+    """
+    Bake snow depth attribute to texture using shader-based Cycles baking.
+    Uses the same approach as generate_heightmap.py.
+
+    Requires:
+    - Terrain object with Geometry Nodes modifier that stores 'snow_depth' attribute
+    - UV map on terrain mesh
+
+    Args:
+        terrain_obj: Terrain mesh object with snow_depth attribute
+        resolution: Texture resolution (square)
+        output_path: Path to save EXR file
+        modifier_name: Optional specific modifier name to use (e.g., "Snow")
+    """
+
+    print(f"Baking snow depth for: {terrain_obj.name}")
+    print(f"Resolution: {resolution}×{resolution}")
+
+    # Find the snow geometry nodes modifier
+    if modifier_name:
+        geo_nodes_modifier = terrain_obj.modifiers.get(modifier_name)
+        if not geo_nodes_modifier:
+            raise ValueError(f"Modifier '{modifier_name}' not found on {terrain_obj.name}")
+        print(f"Using specified modifier: {modifier_name}")
+    else:
+        geo_nodes_modifier = find_snow_modifier(terrain_obj)
+        if not geo_nodes_modifier:
+            print("\nAvailable Geometry Nodes modifiers:")
+            for mod in terrain_obj.modifiers:
+                if mod.type == 'NODES':
+                    print(f"  - {mod.name}")
+            raise ValueError(
+                f"No Geometry Nodes modifier with 'snow_depth' attribute found on {terrain_obj.name}!\n"
+                f"Either add snow accumulation modifier, or specify modifier_name parameter."
+            )
+        print(f"Found snow modifier: {geo_nodes_modifier.name}")
+
+    modifier_states = {}
+    print(f"\nDisabling modifiers after '{geo_nodes_modifier.name}' for baking...")
+    target_mod_index = list(terrain_obj.modifiers).index(geo_nodes_modifier)
+
+    for i, mod in enumerate(terrain_obj.modifiers):
+        modifier_states[mod.name] = {
+            'show_viewport': mod.show_viewport,
+            'show_render': mod.show_render
+        }
+
+        if i > target_mod_index:
+            print(f"  Temporarily disabling: {mod.name}")
+            mod.show_viewport = False
+            mod.show_render = False
+
+    bpy.context.view_layer.update()
+    depsgraph = bpy.context.evaluated_depsgraph_get()
+    evaluated_obj = terrain_obj.evaluated_get(depsgraph)
+    eval_mesh = evaluated_obj.to_mesh()
+
+    if 'snow_depth' not in eval_mesh.attributes:
+        evaluated_obj.to_mesh_clear()
+        for mod_name, state in modifier_states.items():
+            mod = terrain_obj.modifiers.get(mod_name)
+            if mod:
+                mod.show_viewport = state['show_viewport']
+                mod.show_render = state['show_render']
+        raise ValueError("snow_depth attribute missing from evaluated geometry")
+
+    print(f"✓ Verified 'snow_depth' attribute exists")
+    evaluated_obj.to_mesh_clear()
+
+    # Ensure object has UV map
+    if not terrain_obj.data.uv_layers:
+        print("Adding UV map...")
+        terrain_obj.data.uv_layers.new(name="UVMap")
+
+    # Create new image for baking
+    bake_image = bpy.data.images.new(
+        name="SnowDepth_Bake",
+        width=resolution,
+        height=resolution,
+        alpha=False,
+        float_buffer=True,
+        is_data=True
+    )
+
+    print(f"Created bake image: {bake_image.name}")
+
+    original_materials = list(terrain_obj.data.materials)
+    print(f"Object has {len(original_materials)} material slot(s): {[mat.name if mat else 'None' for mat in original_materials]}")
+
+    mat = bpy.data.materials.new(name="SnowDepth_BakeMaterial")
+    mat.use_nodes = True
+    nodes = mat.node_tree.nodes
+    nodes.clear()
+
+    attr_node = nodes.new(type='ShaderNodeAttribute')
+    attr_node.attribute_name = 'snow_depth'
+
+    emission_node = nodes.new(type='ShaderNodeEmission')
+    mat.node_tree.links.new(attr_node.outputs['Fac'], emission_node.inputs['Color'])
+
+    output_node = nodes.new(type='ShaderNodeOutputMaterial')
+    mat.node_tree.links.new(emission_node.outputs['Emission'], output_node.inputs['Surface'])
+
+    image_node = nodes.new(type='ShaderNodeTexImage')
+    image_node.image = bake_image
+    image_node.select = True
+    nodes.active = image_node
+
+    terrain_obj.data.materials.clear()
+    terrain_obj.data.materials.append(mat)
+    print(f"Temporarily replaced all materials with bake material")
+
+    # Select object and set mode
+    bpy.context.view_layer.objects.active = terrain_obj
+    terrain_obj.select_set(True)
+
+    # Ensure we're in object mode
+    if bpy.context.object and bpy.context.object.mode != 'OBJECT':
+        bpy.ops.object.mode_set(mode='OBJECT')
+
+    # Setup render settings for baking
+    bpy.context.scene.render.engine = 'CYCLES'
+    bpy.context.scene.cycles.samples = 1
+    bpy.context.scene.cycles.bake_type = 'EMIT'
+
+    print("Baking with Cycles (EMIT)...")
+    bpy.ops.object.bake(type='EMIT', use_clear=True)
+
+    print("Bake complete!")
+
+    # Verify bake has data (not all black/zero)
+    pixels = list(bake_image.pixels)
+    max_value = max(pixels) if pixels else 0.0
+    avg_value = sum(pixels) / len(pixels) if pixels else 0.0
+    non_zero_count = sum(1 for p in pixels if p > 0.0001)
+    print(f"Baked image stats: max={max_value:.4f}, avg={avg_value:.4f}")
+    print(f"Non-zero pixels: {non_zero_count} ({non_zero_count / len(pixels) * 100:.1f}%)")
+
+    if max_value < 0.0001:
+        print("\n⚠️  WARNING: Baked image appears to be all black!")
+        print("   Possible causes:")
+        print("   - 'snow_depth' attribute doesn't exist in the geometry")
+        print("   - Geometry Nodes modifier is disabled")
+        print("   - Store Named Attribute node is not connected")
+        print("   - Wrong modifier selected (try specifying modifier_name)")
+        print("\n   Continuing anyway, but check your setup...")
+    else:
+        print(f"✓ Bake contains data (values up to {max_value:.4f}m)")
+
+    # Save as EXR
+    if output_path:
+        bake_image.filepath_raw = str(output_path)
+        bake_image.file_format = 'OPEN_EXR'
+        bake_image.use_half_precision = False
+
+        scene = bpy.context.scene
+        original_color_mode = scene.render.image_settings.color_mode
+        original_color_depth = scene.render.image_settings.color_depth
+        original_exr_codec = scene.render.image_settings.exr_codec
+
+        # Use BW mode for single channel (same as heightmap)
+        scene.render.image_settings.color_mode = 'BW'
+        scene.render.image_settings.color_depth = '32'
+        scene.render.image_settings.exr_codec = 'ZIP'
+
+        print(f"Saving EXR with settings: color_mode=BW, depth=32, codec=ZIP")
+        bake_image.save_render(str(output_path), scene=scene)
+
+        scene.render.image_settings.color_mode = original_color_mode
+        scene.render.image_settings.color_depth = original_color_depth
+        scene.render.image_settings.exr_codec = original_exr_codec
+
+        print(f"Saved to: {output_path}")
+        print(f"Format: OpenEXR, 32-bit float, ZIP compression")
+        print(f"File size: {output_path.stat().st_size / 1024:.1f} KB")
+
+    bpy.data.images.remove(bake_image)
+    bpy.data.materials.remove(mat)
+
+    terrain_obj.data.materials.clear()
+    for original_mat in original_materials:
+        terrain_obj.data.materials.append(original_mat)
+    print(f"Restored {len(original_materials)} original material(s)")
+
+    print("\nRestoring modifier states...")
+    for mod_name, state in modifier_states.items():
+        mod = terrain_obj.modifiers.get(mod_name)
+        if mod:
+            mod.show_viewport = state['show_viewport']
+            mod.show_render = state['show_render']
+    print("✓ Modifiers restored")
+
+    return True
+
+
+if __name__ == "__main__":
+    project_root = Path(bpy.data.filepath).parent.parent
+    output_path = project_root / "textures" / "snow_depth.exr"
+
+    output_path.parent.mkdir(parents=True, exist_ok=True)
+
+    # Find terrain object
+    terrain_obj = bpy.data.objects.get("TerrainPlane")
+
+    if not terrain_obj:
+        print("'TerrainPlane' not found. Searching for terrain mesh...")
+        for obj in bpy.data.objects:
+            if obj.type == 'MESH' and ('terrain' in obj.name.lower() or 'plane' in obj.name.lower()):
+                terrain_obj = obj
+                print(f"Using: {obj.name}")
+                break
+
+    if not terrain_obj:
+        raise ValueError("No terrain object found!")
+
+    # CONFIGURATION: Specify modifier name if you have multiple Geometry Nodes modifiers
+    # Leave as None to auto-detect the snow modifier
+    # Example: modifier_name = "Snow" or "Snow Accumulation"
+    modifier_name = "Snow Accumulation"  # Auto-detect by looking for 'snow_depth' attribute
+
+    bake_snow_depth(
+        terrain_obj=terrain_obj,
+        resolution=1000,
+        output_path=output_path,
+        modifier_name=modifier_name  # Specify "Snow" if auto-detect fails
+    )
+
+    print("\n" + "="*60)
+    print("Snow depth baking complete!")
+    print(f"Output: {output_path}")
+    print("="*60)
+    print("\nNext steps:")
+    print("1. Verify snow_depth.exr in textures/ directory")
+    print("2. Open in image viewer to check it's not black")
+    print("3. Load in game with SnowLayer::load()")
+    print("4. Test deformation with player movement")
+    print("\nIf bake is black:")
+    print("- Check that 'snow_depth' attribute exists in Spreadsheet Editor")
+    print("- Verify Geometry Nodes modifier has Store Named Attribute node")
+    print("- Try specifying modifier_name='Snow' explicitly in script")

build.rs

@@ -0,0 +1,7 @@
+fn main()
+{
+    let wesl = wesl::Wesl::new("src/shaders");
+    wesl.build_artifact(&"package::standard".parse().unwrap(), "standard");
+    wesl.build_artifact(&"package::shadow".parse().unwrap(), "shadow");
+    wesl.build_artifact(&"package::terrain".parse().unwrap(), "terrain");
+}

meshes/terrain.gltf

@@ -4,8 +4,36 @@
 		"version":"2.0"
 	},
 	"extensionsUsed":[
+		"KHR_lights_punctual",
 		"EXT_mesh_gpu_instancing"
 	],
+	"extensionsRequired":[
+		"KHR_lights_punctual"
+	],
+	"extensions":{
+		"KHR_lights_punctual":{
+			"lights":[
+				{
+					"color":[
+						1,
+						1,
+						1
+					],
+					"intensity":543.5141306588226,
+					"spot":{
+						"innerConeAngle":0.18840259313583374,
+						"outerConeAngle":0.18840259313583374
+					},
+					"type":"spot",
+					"range":1000,
+					"name":"Spot",
+					"extras":{
+						"light_tag":"lighthouse"
+					}
+				}
+			]
+		}
+	},
 	"scene":0,
 	"scenes":[
 		{
@@ -13,25 +41,33 @@
 			"nodes":[
 				0,
 				1,
-				2
+				2,
+				3,
+				4
 			]
 		}
 	],
 	"nodes":[
 		{
-			"children":[
-				3
-			],
-			"mesh":1,
-			"name":"TerrainPlane"
-		},
-		{
-			"mesh":2,
+			"mesh":0,
 			"name":"TreePrime",
 			"translation":[
-				0,
+				16.22920036315918,
+				29.08228302001953,
+				39.89393615722656
+			]
+		},
+		{
+			"children":[
+				5,
+				6
+			],
+			"mesh":3,
+			"name":"TerrainPlane",
+			"scale":[
+				1.000100016593933,
 				1,
-				0
+				1
 			]
 		},
 		{
@@ -42,36 +78,77 @@
 				-66.48489379882812
 			]
 		},
+		{
+			"name":"PlayerSpawn",
+			"translation":[
+				-351.4849853515625,
+				119.54279327392578,
+				202.97006225585938
+			]
+		},
+		{
+			"extensions":{
+				"KHR_lights_punctual":{
+					"light":0
+				}
+			},
+			"name":"Spot",
+			"rotation":[
+				-0.16434744000434875,
+				-0.37808698415756226,
+				0.006467622704803944,
+				0.9110424518585205
+			],
+			"translation":[
+				-392.0350036621094,
+				238.72787475585938,
+				244.30006408691406
+			]
+		},
 		{
 			"extensions":{
 				"EXT_mesh_gpu_instancing":{
 					"attributes":{
-						"TRANSLATION":11,
-						"ROTATION":12,
-						"SCALE":13
+						"TRANSLATION":17,
+						"ROTATION":18,
+						"SCALE":19
 					}
 				}
 			},
-			"mesh":0,
+			"mesh":1,
 			"name":"TerrainPlane.0"
+		},
+		{
+			"extensions":{
+				"EXT_mesh_gpu_instancing":{
+					"attributes":{
+						"TRANSLATION":17,
+						"ROTATION":18,
+						"SCALE":19
+					}
+				}
+			},
+			"mesh":2,
+			"name":"TerrainPlane.1"
 		}
 	],
 	"materials":[
 		{
 			"doubleSided":true,
-			"emissiveFactor":[
-				1,
-				1,
-				1
-			],
-			"name":"heightmap",
+			"name":"terrain"
+		},
+		{
+			"doubleSided":true,
+			"name":"snow",
 			"pbrMetallicRoughness":{
 				"baseColorFactor":[
-					0,
-					0,
-					0,
+					0.800000011920929,
+					0.800000011920929,
+					0.800000011920929,
 					1
-				]
+				],
+				"metallicFactor":0,
+				"roughnessFactor":0.5
 			}
 		}
 	],
@@ -90,7 +167,7 @@
 			]
 		},
 		{
-			"name":"Plane.001",
+			"name":"Cylinder",
 			"primitives":[
 				{
 					"attributes":{
@@ -98,7 +175,7 @@
 						"NORMAL":5,
 						"TEXCOORD_0":6
 					},
-					"indices":7,
+					"indices":3,
 					"material":0
 				}
 			]
@@ -108,11 +185,35 @@
 			"primitives":[
 				{
 					"attributes":{
-						"POSITION":8,
-						"NORMAL":9,
-						"TEXCOORD_0":10
+						"POSITION":7,
+						"NORMAL":8,
+						"TEXCOORD_0":9
 					},
-					"indices":3
+					"indices":3,
+					"material":1
+				}
+			]
+		},
+		{
+			"name":"Plane.001",
+			"primitives":[
+				{
+					"attributes":{
+						"POSITION":10,
+						"NORMAL":11,
+						"TEXCOORD_0":12
+					},
+					"indices":13,
+					"material":0
+				},
+				{
+					"attributes":{
+						"POSITION":14,
+						"NORMAL":15,
+						"TEXCOORD_0":16
+					},
+					"indices":13,
+					"material":1
 				}
 			]
 		}
@@ -121,204 +222,296 @@
 		{
 			"bufferView":0,
 			"componentType":5126,
-			"count":704,
+			"count":1280,
 			"max":[
-				1,
-				11.999963760375977,
-				1
+				5.561562538146973,
+				16.066009521484375,
+				5.561562538146973
 			],
 			"min":[
-				-1,
+				-5.561562538146973,
 				0,
-				-1
+				-5.561562538146973
 			],
 			"type":"VEC3"
 		},
 		{
 			"bufferView":1,
 			"componentType":5126,
-			"count":704,
+			"count":1280,
 			"type":"VEC3"
 		},
 		{
 			"bufferView":2,
 			"componentType":5126,
-			"count":704,
+			"count":1280,
 			"type":"VEC2"
 		},
 		{
 			"bufferView":3,
 			"componentType":5123,
-			"count":1908,
+			"count":2100,
 			"type":"SCALAR"
 		},
 		{
 			"bufferView":4,
 			"componentType":5126,
-			"count":18196,
+			"count":1280,
 			"max":[
-				500,
-				122.76703643798828,
-				500
+				5.561562538146973,
+				16.066009521484375,
+				5.561562538146973
 			],
 			"min":[
-				-500,
-				-0.000225067138671875,
-				-500
+				-5.561562538146973,
+				0,
+				-5.561562538146973
 			],
 			"type":"VEC3"
 		},
 		{
 			"bufferView":5,
 			"componentType":5126,
-			"count":18196,
+			"count":1280,
 			"type":"VEC3"
 		},
 		{
 			"bufferView":6,
 			"componentType":5126,
-			"count":18196,
+			"count":1280,
 			"type":"VEC2"
 		},
 		{
 			"bufferView":7,
-			"componentType":5123,
-			"count":61206,
-			"type":"SCALAR"
+			"componentType":5126,
+			"count":1280,
+			"max":[
+				5.561562538146973,
+				16.066009521484375,
+				5.561562538146973
+			],
+			"min":[
+				-5.561562538146973,
+				0,
+				-5.561562538146973
+			],
+			"type":"VEC3"
 		},
 		{
 			"bufferView":8,
 			"componentType":5126,
-			"count":704,
-			"max":[
-				1,
-				11.999963760375977,
-				1
-			],
-			"min":[
-				-1,
-				0,
-				-1
-			],
+			"count":1280,
 			"type":"VEC3"
 		},
 		{
 			"bufferView":9,
 			"componentType":5126,
-			"count":704,
-			"type":"VEC3"
+			"count":1280,
+			"type":"VEC2"
 		},
 		{
 			"bufferView":10,
 			"componentType":5126,
-			"count":704,
-			"type":"VEC2"
+			"count":10404,
+			"max":[
+				500,
+				110.45686340332031,
+				500
+			],
+			"min":[
+				-500,
+				-0.9473495483398438,
+				-500
+			],
+			"type":"VEC3"
 		},
 		{
 			"bufferView":11,
 			"componentType":5126,
-			"count":5588,
+			"count":10404,
 			"type":"VEC3"
 		},
 		{
 			"bufferView":12,
 			"componentType":5126,
-			"count":5588,
-			"type":"VEC4"
+			"count":10404,
+			"type":"VEC2"
 		},
 		{
 			"bufferView":13,
+			"componentType":5123,
+			"count":61206,
+			"type":"SCALAR"
+		},
+		{
+			"bufferView":14,
 			"componentType":5126,
-			"count":5588,
+			"count":10404,
+			"max":[
+				500,
+				110.7568588256836,
+				500
+			],
+			"min":[
+				-500,
+				-0.6476199626922607,
+				-500
+			],
+			"type":"VEC3"
+		},
+		{
+			"bufferView":15,
+			"componentType":5126,
+			"count":10404,
+			"type":"VEC3"
+		},
+		{
+			"bufferView":16,
+			"componentType":5126,
+			"count":10404,
+			"type":"VEC2"
+		},
+		{
+			"bufferView":17,
+			"componentType":5126,
+			"count":2380,
+			"type":"VEC3"
+		},
+		{
+			"bufferView":18,
+			"componentType":5126,
+			"count":2380,
+			"type":"VEC4"
+		},
+		{
+			"bufferView":19,
+			"componentType":5126,
+			"count":2380,
 			"type":"VEC3"
 		}
 	],
 	"bufferViews":[
 		{
 			"buffer":0,
-			"byteLength":8448,
+			"byteLength":15360,
 			"byteOffset":0,
 			"target":34962
 		},
 		{
 			"buffer":0,
-			"byteLength":8448,
-			"byteOffset":8448,
+			"byteLength":15360,
+			"byteOffset":15360,
 			"target":34962
 		},
 		{
 			"buffer":0,
-			"byteLength":5632,
-			"byteOffset":16896,
+			"byteLength":10240,
+			"byteOffset":30720,
 			"target":34962
 		},
 		{
 			"buffer":0,
-			"byteLength":3816,
-			"byteOffset":22528,
+			"byteLength":4200,
+			"byteOffset":40960,
 			"target":34963
 		},
 		{
 			"buffer":0,
-			"byteLength":218352,
-			"byteOffset":26344,
+			"byteLength":15360,
+			"byteOffset":45160,
 			"target":34962
 		},
 		{
 			"buffer":0,
-			"byteLength":218352,
-			"byteOffset":244696,
+			"byteLength":15360,
+			"byteOffset":60520,
 			"target":34962
 		},
 		{
 			"buffer":0,
-			"byteLength":145568,
-			"byteOffset":463048,
+			"byteLength":10240,
+			"byteOffset":75880,
+			"target":34962
+		},
+		{
+			"buffer":0,
+			"byteLength":15360,
+			"byteOffset":86120,
+			"target":34962
+		},
+		{
+			"buffer":0,
+			"byteLength":15360,
+			"byteOffset":101480,
+			"target":34962
+		},
+		{
+			"buffer":0,
+			"byteLength":10240,
+			"byteOffset":116840,
+			"target":34962
+		},
+		{
+			"buffer":0,
+			"byteLength":124848,
+			"byteOffset":127080,
+			"target":34962
+		},
+		{
+			"buffer":0,
+			"byteLength":124848,
+			"byteOffset":251928,
+			"target":34962
+		},
+		{
+			"buffer":0,
+			"byteLength":83232,
+			"byteOffset":376776,
 			"target":34962
 		},
 		{
 			"buffer":0,
 			"byteLength":122412,
-			"byteOffset":608616,
+			"byteOffset":460008,
 			"target":34963
 		},
 		{
 			"buffer":0,
-			"byteLength":8448,
-			"byteOffset":731028,
+			"byteLength":124848,
+			"byteOffset":582420,
 			"target":34962
 		},
 		{
 			"buffer":0,
-			"byteLength":8448,
-			"byteOffset":739476,
+			"byteLength":124848,
+			"byteOffset":707268,
 			"target":34962
 		},
 		{
 			"buffer":0,
-			"byteLength":5632,
-			"byteOffset":747924,
+			"byteLength":83232,
+			"byteOffset":832116,
 			"target":34962
 		},
 		{
 			"buffer":0,
-			"byteLength":67056,
-			"byteOffset":753556
+			"byteLength":28560,
+			"byteOffset":915348
 		},
 		{
 			"buffer":0,
-			"byteLength":89408,
-			"byteOffset":820612
+			"byteLength":38080,
+			"byteOffset":943908
 		},
 		{
 			"buffer":0,
-			"byteLength":67056,
-			"byteOffset":910020
+			"byteLength":28560,
+			"byteOffset":981988
 		}
 	],
 	"buffers":[
 		{
-			"byteLength":977076,
+			"byteLength":1010548,
 			"uri":"terrain.bin"
 		}
 	]

shaders/standard.wgsl

@@ -1,38 +0,0 @@
-@vertex
-fn vs_main(input: VertexInput) -> VertexOutput {
-    var output: VertexOutput;
-
-    let instance_model = mat4x4<f32>(
-        input.instance_model_0,
-        input.instance_model_1,
-        input.instance_model_2,
-        input.instance_model_3
-    );
-
-    let world_pos = instance_model * vec4<f32>(input.position, 1.0);
-    output.world_position = world_pos.xyz;
-    output.clip_position = uniforms.projection * uniforms.view * world_pos;
-
-    let normal_matrix = mat3x3<f32>(
-        instance_model[0].xyz,
-        instance_model[1].xyz,
-        instance_model[2].xyz
-    );
-    output.world_normal = normalize(normal_matrix * input.normal);
-
-    output.light_space_position = uniforms.light_view_projection * world_pos;
-
-    return output;
-}
-
-@fragment
-fn fs_main(input: VertexOutput) -> @location(0) vec4<f32> {
-    let shadow = sample_shadow_map(input.light_space_position);
-
-    let tile_scale = 1.0;
-    let flowmap_strokes = flowmap_path_lighting_with_shadow(input.world_position, input.world_normal, tile_scale, shadow);
-    let point_strokes = point_lighting_with_shadow(input.world_position, input.world_normal, vec3<f32>(0.0, 100.0, 0.0), tile_scale, shadow);
-    let brightness = max(flowmap_strokes, point_strokes);
-
-    return vec4<f32>(brightness, brightness, brightness, 1.0);
-}

src/camera.rs

@@ -1,6 +1,11 @@
 use bytemuck::{Pod, Zeroable};
 use glam::{Mat4, Vec3};
 
+use crate::components::CameraComponent;
+use crate::entity::EntityHandle;
+use crate::render;
+use crate::world::{Transform, World};
+
 #[repr(C)]
 #[derive(Clone, Copy, Pod, Zeroable)]
 pub struct CameraUniforms
@@ -26,147 +31,21 @@ impl CameraUniforms
     }
 }
 
-pub struct Camera
-{
-    pub position: Vec3,
-    pub target: Vec3,
-    pub up: Vec3,
-    pub fov: f32,
-    pub aspect: f32,
-    pub near: f32,
-    pub far: f32,
-    pub yaw: f32,
-    pub pitch: f32,
-    pub is_following: bool,
-    pub follow_offset: Vec3,
-}
+pub struct Camera;
 
 impl Camera
 {
-    pub fn init(aspect: f32) -> Self
+    pub fn spawn(world: &mut World, position: Vec3) -> EntityHandle
     {
-        Self {
-            position: Vec3::new(15.0, 15.0, 15.0),
-            target: Vec3::ZERO,
-            up: Vec3::Y,
-            fov: 45.0_f32.to_radians(),
-            aspect,
-            near: 0.1,
-            far: 100.0,
-            yaw: -135.0_f32.to_radians(),
-            pitch: -30.0_f32.to_radians(),
-            is_following: true,
-            follow_offset: Vec3::ZERO,
-        }
-    }
+        let camera_entity = world.spawn();
 
-    pub fn view_matrix(&self) -> Mat4
-    {
-        Mat4::look_at_rh(self.position, self.target, self.up)
-    }
+        let camera_component = CameraComponent::new(render::aspect_ratio());
 
-    pub fn projection_matrix(&self) -> Mat4
-    {
-        Mat4::perspective_rh(self.fov, self.aspect, self.near, self.far)
-    }
+        let transform = Transform::from_position(position);
 
-    pub fn update_rotation(&mut self, mouse_delta: (f32, f32), sensitivity: f32)
-    {
-        self.yaw += mouse_delta.0 * sensitivity;
-        self.pitch -= mouse_delta.1 * sensitivity;
+        world.cameras.insert(camera_entity, camera_component);
+        world.transforms.insert(camera_entity, transform);
 
-        self.pitch = self
-            .pitch
-            .clamp(-89.0_f32.to_radians(), 89.0_f32.to_radians());
-    }
-
-    pub fn get_forward(&self) -> Vec3
-    {
-        Vec3::new(
-            self.yaw.cos() * self.pitch.cos(),
-            self.pitch.sin(),
-            self.yaw.sin() * self.pitch.cos(),
-        )
-        .normalize()
-    }
-
-    pub fn get_right(&self) -> Vec3
-    {
-        self.get_forward().cross(Vec3::Y).normalize()
-    }
-
-    pub fn get_forward_horizontal(&self) -> Vec3
-    {
-        Vec3::new(self.yaw.cos(), 0.0, self.yaw.sin()).normalize()
-    }
-
-    pub fn get_right_horizontal(&self) -> Vec3
-    {
-        self.get_forward_horizontal().cross(Vec3::Y).normalize()
-    }
-
-    pub fn update_noclip(&mut self, input: Vec3, speed: f32)
-    {
-        let forward = self.get_forward();
-        let right = self.get_right();
-
-        self.position += forward * input.z * speed;
-        self.position += right * input.x * speed;
-        self.position += Vec3::Y * input.y * speed;
-
-        self.target = self.position + forward;
-    }
-
-    pub fn start_following(&mut self, target_position: Vec3)
-    {
-        self.is_following = true;
-        self.follow_offset = self.position - target_position;
-
-        let distance = self.follow_offset.length();
-        if distance > 0.0
-        {
-            self.pitch = (self.follow_offset.y / distance).asin();
-            self.yaw = self.follow_offset.z.atan2(self.follow_offset.x) + std::f32::consts::PI;
-        }
-    }
-
-    pub fn stop_following(&mut self)
-    {
-        self.is_following = false;
-
-        let look_direction = (self.target - self.position).normalize();
-
-        self.yaw = look_direction.z.atan2(look_direction.x);
-        self.pitch = look_direction.y.asin();
-    }
-
-    pub fn update_follow(&mut self, target_position: Vec3, mouse_delta: (f32, f32), sensitivity: f32)
-    {
-        if !self.is_following
-        {
-            return;
-        }
-
-        if mouse_delta.0.abs() > 0.0 || mouse_delta.1.abs() > 0.0
-        {
-            self.yaw += mouse_delta.0 * sensitivity;
-            self.pitch += mouse_delta.1 * sensitivity;
-
-            self.pitch = self
-                .pitch
-                .clamp(-89.0_f32.to_radians(), 89.0_f32.to_radians());
-        }
-
-        let distance = self.follow_offset.length();
-
-        let orbit_yaw = self.yaw + std::f32::consts::PI;
-
-        let offset_x = distance * orbit_yaw.cos() * self.pitch.cos();
-        let offset_y = distance * self.pitch.sin();
-        let offset_z = distance * orbit_yaw.sin() * self.pitch.cos();
-
-        self.follow_offset = Vec3::new(offset_x, offset_y, offset_z);
-        self.position = target_position + self.follow_offset;
-        self.target = target_position;
+        camera_entity
     }
 }

src/components/camera_follow.rs

@@ -1,32 +0,0 @@
-use glam::Vec3;
-
-use crate::entity::EntityHandle;
-
-#[derive(Clone, Copy)]
-pub struct CameraFollowComponent
-{
-    pub target_entity: EntityHandle,
-    pub offset: Vec3,
-    pub is_following: bool,
-}
-
-impl CameraFollowComponent
-{
-    pub fn new(target_entity: EntityHandle) -> Self
-    {
-        Self {
-            target_entity,
-            offset: Vec3::ZERO,
-            is_following: false,
-        }
-    }
-
-    pub fn with_offset(target_entity: EntityHandle, offset: Vec3) -> Self
-    {
-        Self {
-            target_entity,
-            offset,
-            is_following: true,
-        }
-    }
-}

src/components/dissolve.rs

@@ -0,0 +1,27 @@
+pub struct DissolveComponent
+{
+    pub amount: f32,
+    pub target_amount: f32,
+    pub transition_speed: f32,
+}
+
+impl DissolveComponent
+{
+    pub fn new() -> Self
+    {
+        Self {
+            amount: 0.0,
+            target_amount: 0.0,
+            transition_speed: 3.0,
+        }
+    }
+
+    pub fn with_speed(transition_speed: f32) -> Self
+    {
+        Self {
+            amount: 0.0,
+            target_amount: 0.0,
+            transition_speed,
+        }
+    }
+}

src/components/follow.rs

@@ -0,0 +1,10 @@
+use crate::entity::EntityHandle;
+use crate::utility::transform::Transform;
+
+pub struct FollowComponent
+{
+    pub target: EntityHandle,
+    pub offset: Transform,
+    pub inherit_rotation: bool,
+    pub inherit_scale: bool,
+}

src/components/jump.rs

@@ -41,12 +41,7 @@ impl Default for JumpConfig
             max_air_momentum: 8.0,
             air_damping_active: 0.4,
             air_damping_passive: 0.9,
-            jump_curve: CubicBez::new(
-                (0.0, 0.0),
-                (0.4, 0.75),
-                (0.7, 0.9),
-                (1.0, 1.0),
-            ),
+            jump_curve: CubicBez::new((0.0, 0.0), (0.4, 0.75), (0.7, 0.9), (1.0, 1.0)),
             jump_context: JumpContext::default(),
         }
     }

src/components/lights/directional.rs

@@ -0,0 +1,18 @@
+use glam::Vec3;
+
+pub struct DirectionallightComponent
+{
+    pub offset: Vec3,
+    pub direction: Vec3,
+}
+
+impl DirectionallightComponent
+{
+    pub fn new(offset: Vec3, direction: Vec3) -> Self
+    {
+        Self {
+            offset,
+            direction: direction.normalize(),
+        }
+    }
+}

src/components/lights/mod.rs

@@ -0,0 +1,3 @@
+pub mod directional;
+pub mod point;
+pub mod spot;

src/components/lights/point.rs

@@ -0,0 +1,14 @@
+use glam::Vec3;
+
+pub struct PointlightComponent
+{
+    pub offset: Vec3,
+}
+
+impl PointlightComponent
+{
+    pub fn new(offset: Vec3) -> Self
+    {
+        Self { offset }
+    }
+}

src/components/lights/spot.rs

@@ -0,0 +1,25 @@
+use glam::Vec3;
+
+#[derive(Debug, Copy, Clone)]
+pub struct SpotlightComponent
+{
+    pub offset: Vec3,
+    pub direction: Vec3,
+    pub range: f32,
+    pub inner_angle: f32,
+    pub outer_angle: f32,
+}
+
+impl SpotlightComponent
+{
+    pub fn new(offset: Vec3, direction: Vec3, range: f32, inner_angle: f32, outer_angle: f32) -> Self
+    {
+        Self {
+            offset,
+            direction: direction.normalize(),
+            range,
+            inner_angle,
+            outer_angle,
+        }
+    }
+}

src/components/mod.rs

@@ -1,16 +1,22 @@
 pub mod camera;
-pub mod camera_follow;
+pub mod dissolve;
+pub mod follow;
 pub mod input;
 pub mod jump;
+pub mod lights;
 pub mod mesh;
 pub mod movement;
 pub mod physics;
 pub mod player_tag;
+pub mod rotate;
 pub mod state_machine;
+pub mod tree_tag;
 
 pub use camera::CameraComponent;
-pub use camera_follow::CameraFollowComponent;
+pub use dissolve::DissolveComponent;
+pub use follow::FollowComponent;
 pub use input::InputComponent;
 pub use mesh::MeshComponent;
 pub use movement::MovementComponent;
 pub use physics::PhysicsComponent;
+pub use rotate::RotateComponent;

src/components/movement.rs

@@ -43,7 +43,7 @@ impl MovementConfig
                 (1.0, 1.0),
             ),
             walking_damping: 0.8,
-            max_walking_speed: 6.0,
+            max_walking_speed: 12.0,
             idle_damping: 0.1,
             movement_context: MovementContext::new(),
         }

src/components/rotate.rs

@@ -0,0 +1,15 @@
+use glam::Vec3;
+
+pub struct RotateComponent
+{
+    pub axis: Vec3,
+    pub speed: f32,
+}
+
+impl RotateComponent
+{
+    pub fn new(axis: Vec3, speed: f32) -> Self
+    {
+        Self { axis, speed }
+    }
+}

src/components/tree_tag.rs

@@ -0,0 +1 @@
+pub struct TreeTag;

src/debug/collider_debug.rs

@@ -126,6 +126,8 @@ pub fn render_collider_debug() -> Vec<DrawCall>
 
             let instance_data = InstanceRaw {
                 model: model.to_cols_array_2d(),
+                dissolve_amount: 0.0,
+                _padding: [0.0; 3],
             };
 
             let instance_buffer = render::with_device(|device| {
@@ -153,6 +155,8 @@ pub fn render_collider_debug() -> Vec<DrawCall>
         {
             let instance_data = InstanceRaw {
                 model: Mat4::IDENTITY.to_cols_array_2d(),
+                dissolve_amount: 0.0,
+                _padding: [0.0; 3],
             };
 
             let instance_buffer = render::with_device(|device| {

src/debug/mod.rs

@@ -1,5 +1,3 @@
 pub mod collider_debug;
-pub mod noclip;
 
-pub use collider_debug::{render_collider_debug, set_debug_heightfield};
-pub use noclip::{update_follow_camera, update_noclip_camera};
+pub use collider_debug::render_collider_debug;

src/empty.rs

@@ -0,0 +1,101 @@
+use glam::Mat4;
+use std::path::Path;
+
+pub struct EmptyNode
+{
+    pub name: String,
+    pub transform: Mat4,
+}
+
+impl EmptyNode
+{
+    pub fn new(name: String, transform: Mat4) -> Self
+    {
+        Self { name, transform }
+    }
+}
+
+pub struct Empties
+{
+    nodes: Vec<EmptyNode>,
+}
+
+impl Empties
+{
+    fn new(nodes: Vec<EmptyNode>) -> Self
+    {
+        Self { nodes }
+    }
+
+    pub fn into_nodes(self) -> Vec<EmptyNode>
+    {
+        self.nodes
+    }
+
+    pub fn load_gltf_empties(path: impl AsRef<Path>)
+        -> Result<Empties, Box<dyn std::error::Error>>
+    {
+        let (gltf, _buffers, _images) = gltf::import(path)?;
+
+        let mut all_empties = Vec::new();
+
+        for scene in gltf.scenes()
+        {
+            for node in scene.nodes()
+            {
+                Self::process_node(&node, Mat4::IDENTITY, &mut all_empties)?;
+            }
+        }
+
+        Ok(Empties::new(all_empties))
+    }
+
+    fn process_node(
+        node: &gltf::Node,
+        parent_transform: Mat4,
+        all_empties: &mut Vec<EmptyNode>,
+    ) -> Result<(), Box<dyn std::error::Error>>
+    {
+        let local_transform = Mat4::from_cols_array_2d(&node.transform().matrix());
+        let global_transform = parent_transform * local_transform;
+
+        let is_empty = node.mesh().is_none() && node.light().is_none() && node.camera().is_none();
+
+        if is_empty
+        {
+            let name = node.name().unwrap_or("Unnamed").to_string();
+            all_empties.push(EmptyNode::new(name, global_transform));
+        }
+
+        for child in node.children()
+        {
+            Self::process_node(&child, global_transform, all_empties)?;
+        }
+
+        Ok(())
+    }
+
+    pub fn load_empties(path: impl AsRef<Path>) -> Result<Empties, Box<dyn std::error::Error>>
+    {
+        Self::load_gltf_empties(path)
+    }
+
+    pub fn get_empty_by_name(
+        gltf_path: &str,
+        name: &str,
+    ) -> anyhow::Result<Option<crate::empty::EmptyNode>>
+    {
+        let empties = Self::load_empties(gltf_path)
+            .map_err(|e| anyhow::anyhow!("Failed to load empty nodes: {}", e))?;
+
+        for empty_node in empties.into_nodes()
+        {
+            if empty_node.name == name
+            {
+                return Ok(Some(empty_node));
+            }
+        }
+
+        Ok(None)
+    }
+}

src/light.rs

@@ -0,0 +1,153 @@
+use glam::{Mat4, Vec3};
+use gltf::json::Extras;
+use std::{ops::Deref, path::Path};
+
+use crate::{
+    components::lights::spot::SpotlightComponent,
+    world::{Transform, World},
+};
+
+pub struct LightData
+{
+    pub component: SpotlightComponent,
+    pub transform: Mat4,
+    pub tag: Option<String>,
+}
+
+pub struct Lights
+{
+    spotlights: Vec<LightData>,
+}
+
+impl Lights
+{
+    fn new(spotlights: Vec<LightData>) -> Self
+    {
+        Self { spotlights }
+    }
+
+    pub fn into_spotlights(self) -> Vec<LightData>
+    {
+        self.spotlights
+    }
+
+    pub fn load_gltf_lights(path: impl AsRef<Path>) -> Result<Lights, Box<dyn std::error::Error>>
+    {
+        let (gltf, _buffers, _images) = gltf::import(path)?;
+
+        let mut all_directional = Vec::new();
+        let mut all_point = Vec::new();
+        let mut all_spot = Vec::new();
+
+        for scene in gltf.scenes()
+        {
+            for node in scene.nodes()
+            {
+                Self::process_node(
+                    &node,
+                    Mat4::IDENTITY,
+                    &mut all_directional,
+                    &mut all_point,
+                    &mut all_spot,
+                )?;
+            }
+        }
+
+        Ok(Lights::new(all_spot))
+    }
+
+    fn process_node(
+        node: &gltf::Node,
+        parent_transform: Mat4,
+        all_directional: &mut Vec<LightData>,
+        all_point: &mut Vec<LightData>,
+        all_spot: &mut Vec<LightData>,
+    ) -> Result<(), Box<dyn std::error::Error>>
+    {
+        let local_transform = Mat4::from_cols_array_2d(&node.transform().matrix());
+        let global_transform = parent_transform * local_transform;
+
+        if let Some(light) = node.light()
+        {
+            let local_transform = Mat4::from_cols_array_2d(&node.transform().matrix());
+            let global_transform = parent_transform * local_transform;
+            let (_scale, rotation, _translation) = global_transform.to_scale_rotation_translation();
+
+            let tag = serde_json::to_value(light.extras())
+                .ok()
+                .and_then(|extras| {
+                    extras
+                        .get("light_tag")
+                        .and_then(|v| v.as_str())
+                        .map(String::from)
+                });
+
+            match light.kind()
+            {
+                gltf::khr_lights_punctual::Kind::Directional => todo!(),
+                gltf::khr_lights_punctual::Kind::Point => todo!(),
+                gltf::khr_lights_punctual::Kind::Spot {
+                    inner_cone_angle,
+                    outer_cone_angle,
+                } =>
+                {
+                    let range = light.range().unwrap_or(100.0);
+                    let spotlight = SpotlightComponent::new(
+                        Vec3::ZERO,
+                        rotation * -Vec3::Z,
+                        range,
+                        inner_cone_angle,
+                        outer_cone_angle,
+                    );
+                    all_spot.push(LightData {
+                        component: spotlight,
+                        transform: global_transform,
+                        tag,
+                    });
+                },
+            }
+        }
+
+        for child in node.children()
+        {
+            Self::process_node(
+                &child,
+                global_transform,
+                all_directional,
+                all_point,
+                all_spot,
+            )?;
+        }
+
+        Ok(())
+    }
+
+    pub fn load_lights(path: impl AsRef<Path>) -> Result<Lights, Box<dyn std::error::Error>>
+    {
+        crate::render::with_device(|_device| Lights::load_gltf_lights(path))
+    }
+
+    pub fn spawn_lights(world: &mut World, spotlights: Vec<LightData>)
+    {
+        use crate::components::RotateComponent;
+
+        for light_data in spotlights
+        {
+            let entity = world.spawn();
+            let transform = Transform::from_matrix(light_data.transform);
+
+            world.transforms.insert(entity, transform);
+            world.spotlights.insert(entity, light_data.component);
+
+            if let Some(tag) = light_data.tag
+            {
+                if tag == "lighthouse"
+                {
+                    world
+                        .rotates
+                        .insert(entity, RotateComponent::new(Vec3::Y, 1.0));
+                }
+            }
+        }
+    }
+}

src/main.rs

@@ -2,20 +2,24 @@ mod camera;
 mod components;
 mod debug;
 mod draw;
+mod empty;
 mod entity;
 mod event;
 mod heightmap;
+mod light;
 mod mesh;
 mod physics;
-mod picking;
 mod player;
 mod postprocess;
 mod render;
 mod shader;
+mod snow;
+mod snow_light;
+mod space;
 mod state;
 mod systems;
 mod terrain;
-mod texture_loader;
+mod texture;
 mod utility;
 mod world;
 
@@ -26,16 +30,21 @@ use render::Renderer;
 use utility::input::InputState;
 use world::{Transform, World};
 
-use crate::components::{CameraComponent, CameraFollowComponent};
+use crate::camera::Camera;
+use crate::components::CameraComponent;
 use crate::debug::render_collider_debug;
 use crate::entity::EntityHandle;
+use crate::light::Lights;
 use crate::physics::PhysicsManager;
 use crate::player::Player;
+use crate::space::Space;
 use crate::systems::{
     camera_follow_system, camera_input_system, camera_noclip_system, physics_sync_system,
-    player_input_system, render_system, start_camera_following, state_machine_physics_system,
-    state_machine_system, stop_camera_following,
+    player_input_system, render_system, rotate_system, spotlight_sync_system,
+    start_camera_following, state_machine_physics_system, state_machine_system,
+    stop_camera_following,
 };
+use crate::snow::{SnowConfig, SnowLayer};
 use crate::terrain::{Terrain, TerrainConfig};
 use crate::utility::time::Time;
 
@@ -45,26 +54,43 @@ fn main() -> Result<(), Box<dyn std::error::Error>>
     let video_subsystem = sdl_context.video()?;
 
     let window = video_subsystem
-        .window("snow_trail", 800, 600)
+        .window("snow_trail", 1200, 900)
         .position_centered()
         .resizable()
         .vulkan()
         .build()?;
-
-    let renderer = pollster::block_on(Renderer::new(&window, 1))?;
+    let renderer = pollster::block_on(Renderer::new(&window, 2))?;
     render::init(renderer);
 
+    let space = Space::load_space("meshes/terrain.gltf")?;
     let terrain_config = TerrainConfig::default();
 
+    let player_spawn = space.player_spawn;
+    let camera_spawn = space.camera_spawn_position();
+
     let mut world = World::new();
-    let player_entity = Player::spawn(&mut world);
-    let _terrain_entity = Terrain::spawn(&mut world, &terrain_config)?;
+
+    let _player_entity = Player::spawn(&mut world, player_spawn);
+    let _terrain_entity = Terrain::spawn(&mut world, space.mesh_data, &terrain_config)?;
+    Lights::spawn_lights(&mut world, space.spotlights);
 
     render::set_terrain_data();
 
+    let terrain_half_size = terrain_config.size / 2.0;
+    render::init_snow_light_accumulation(
+        glam::Vec2::new(-terrain_half_size.x, -terrain_half_size.y),
+        glam::Vec2::new(terrain_half_size.x, terrain_half_size.y),
+    );
+
+    let snow_config = SnowConfig::default();
+    let snow_layer = SnowLayer::load(&mut world, &snow_config)?;
+    println!("Snow layer loaded successfully");
+
+    render::set_snow_depth(&snow_layer.depth_texture_view);
+
     let mut noclip_mode = true;
 
-    let camera_entity = spawn_camera(&mut world, player_entity);
+    let camera_entity = Camera::spawn(&mut world, camera_spawn);
     if noclip_mode == false
     {
         start_camera_following(&mut world, camera_entity);
@@ -150,6 +176,11 @@ fn main() -> Result<(), Box<dyn std::error::Error>>
 
         state_machine_system(&mut world, delta);
 
+        rotate_system(&mut world, delta);
+
+        let spotlights = spotlight_sync_system(&world);
+        render::update_spotlights(spotlights);
+
         let mut draw_calls = render_system(&world);
         draw_calls.extend(render_collider_debug());
 
@@ -161,12 +192,22 @@ fn main() -> Result<(), Box<dyn std::error::Error>>
                     get_view_matrix(&world, camera_entity, camera_transform, camera_component);
                 let projection = camera_component.projection_matrix();
 
-                render::render_with_matrices(
+                let player_pos = world
+                    .player_tags
+                    .all()
+                    .first()
+                    .and_then(|e| world.transforms.get(*e))
+                    .map(|t| t.position)
+                    .unwrap_or(Vec3::ZERO);
+
+                render::render(
                     &view,
                     &projection,
                     camera_transform.position,
+                    player_pos,
                     &draw_calls,
                     time,
+                    delta,
                 );
             }
         }
@@ -183,27 +224,6 @@ fn main() -> Result<(), Box<dyn std::error::Error>>
     Ok(())
 }
 
-fn spawn_camera(world: &mut World, target_entity: EntityHandle) -> EntityHandle
-{
-    let camera_entity = world.spawn();
-
-    let camera_component = CameraComponent::new(render::aspect_ratio());
-    let camera_follow = CameraFollowComponent::new(target_entity);
-
-    let initial_position = Vec3::new(15.0, 15.0, 15.0);
-    let transform = Transform {
-        position: initial_position,
-        rotation: glam::Quat::IDENTITY,
-        scale: Vec3::ONE,
-    };
-
-    world.cameras.insert(camera_entity, camera_component);
-    world.camera_follows.insert(camera_entity, camera_follow);
-    world.transforms.insert(camera_entity, transform);
-
-    camera_entity
-}
-
 fn get_view_matrix(
     world: &World,
     camera_entity: EntityHandle,
@@ -211,18 +231,15 @@ fn get_view_matrix(
     camera_component: &CameraComponent,
 ) -> glam::Mat4
 {
-    if let Some(follow) = world.camera_follows.get(camera_entity)
+    if let Some(follow) = world.follows.get(camera_entity)
     {
-        if follow.is_following
+        if let Some(target_transform) = world.transforms.get(follow.target)
         {
-            if let Some(target_transform) = world.transforms.get(follow.target_entity)
-            {
-                return glam::Mat4::look_at_rh(
-                    camera_transform.position,
-                    target_transform.position,
-                    Vec3::Y,
-                );
-            }
+            return glam::Mat4::look_at_rh(
+                camera_transform.position,
+                target_transform.position,
+                Vec3::Y,
+            );
         }
     }
 

src/mesh.rs

@@ -48,6 +48,7 @@ pub struct InstanceData
     pub position: Vec3,
     pub rotation: Quat,
     pub scale: Vec3,
+    pub dissolve_amount: f32,
 }
 
 impl InstanceData
@@ -57,6 +58,8 @@ impl InstanceData
         let model = Mat4::from_scale_rotation_translation(self.scale, self.rotation, self.position);
         InstanceRaw {
             model: model.to_cols_array_2d(),
+            dissolve_amount: self.dissolve_amount,
+            _padding: [0.0; 3],
         }
     }
 }
@@ -66,6 +69,8 @@ impl InstanceData
 pub struct InstanceRaw
 {
     pub model: [[f32; 4]; 4],
+    pub dissolve_amount: f32,
+    pub _padding: [f32; 3],
 }
 
 impl InstanceRaw
@@ -96,6 +101,11 @@ impl InstanceRaw
                     shader_location: 6,
                     format: wgpu::VertexFormat::Float32x4,
                 },
+                wgpu::VertexAttribute {
+                    offset: (std::mem::size_of::<[f32; 4]>() * 4) as wgpu::BufferAddress,
+                    shader_location: 7,
+                    format: wgpu::VertexFormat::Float32,
+                },
             ],
         }
     }
@@ -506,88 +516,92 @@ impl Mesh
                 {
                     let extensions = json_node.get("extensions").unwrap();
                     let instancing_ext = extensions.get("EXT_mesh_gpu_instancing").unwrap();
-                        let mut mesh_vertices = Vec::new();
-                        let mut mesh_indices = Vec::new();
+                    let mut mesh_vertices = Vec::new();
+                    let mut mesh_indices = Vec::new();
 
-                        for primitive in mesh_data.primitives()
+                    for primitive in mesh_data.primitives()
+                    {
+                        let reader = primitive
+                            .reader(|buffer| buffers.get(buffer.index()).map(|data| &data[..]));
+
+                        let positions = reader
+                            .read_positions()
+                            .ok_or_else(|| anyhow::anyhow!("Missing position data"))?
+                            .collect::<Vec<[f32; 3]>>();
+
+                        let normals = reader
+                            .read_normals()
+                            .ok_or_else(|| anyhow::anyhow!("Missing normal data"))?
+                            .collect::<Vec<[f32; 3]>>();
+
+                        let uvs = reader
+                            .read_tex_coords(0)
+                            .map(|iter| iter.into_f32().collect::<Vec<[f32; 2]>>())
+                            .unwrap_or_else(|| vec![[0.0, 0.0]; positions.len()]);
+
+                        let base_index = mesh_vertices.len() as u32;
+
+                        for ((pos, normal), uv) in
+                            positions.iter().zip(normals.iter()).zip(uvs.iter())
                         {
-                            let reader = primitive
-                                .reader(|buffer| buffers.get(buffer.index()).map(|data| &data[..]));
-
-                            let positions = reader
-                                .read_positions()
-                                .ok_or_else(|| anyhow::anyhow!("Missing position data"))?
-                                .collect::<Vec<[f32; 3]>>();
-
-                            let normals = reader
-                                .read_normals()
-                                .ok_or_else(|| anyhow::anyhow!("Missing normal data"))?
-                                .collect::<Vec<[f32; 3]>>();
-
-                            let uvs = reader
-                                .read_tex_coords(0)
-                                .map(|iter| iter.into_f32().collect::<Vec<[f32; 2]>>())
-                                .unwrap_or_else(|| vec![[0.0, 0.0]; positions.len()]);
-
-                            let base_index = mesh_vertices.len() as u32;
-
-                            for ((pos, normal), uv) in
-                                positions.iter().zip(normals.iter()).zip(uvs.iter())
-                            {
-                                mesh_vertices.push(Vertex {
-                                    position: *pos,
-                                    normal: *normal,
-                                    uv: *uv,
-                                });
-                            }
-
-                            if let Some(indices_reader) = reader.read_indices()
-                            {
-                                mesh_indices
-                                    .extend(indices_reader.into_u32().map(|i| i + base_index));
-                            }
+                            mesh_vertices.push(Vertex {
+                                position: *pos,
+                                normal: *normal,
+                                uv: *uv,
+                            });
                         }
 
-                        let attributes = instancing_ext
-                            .get("attributes")
-                            .and_then(|v| v.as_object())
-                            .ok_or_else(|| anyhow::anyhow!("Missing attributes in EXT_mesh_gpu_instancing"))?;
+                        if let Some(indices_reader) = reader.read_indices()
+                        {
+                            mesh_indices.extend(indices_reader.into_u32().map(|i| i + base_index));
+                        }
+                    }
 
-                        let translation_accessor_index = attributes
-                            .get("TRANSLATION")
-                            .and_then(|v| v.as_u64())
-                            .ok_or_else(|| anyhow::anyhow!("Missing TRANSLATION in instancing extension"))? as usize;
+                    let attributes = instancing_ext
+                        .get("attributes")
+                        .and_then(|v| v.as_object())
+                        .ok_or_else(|| {
+                            anyhow::anyhow!("Missing attributes in EXT_mesh_gpu_instancing")
+                        })?;
 
-                        let rotation_accessor_index = attributes
-                            .get("ROTATION")
-                            .and_then(|v| v.as_u64())
-                            .ok_or_else(|| anyhow::anyhow!("Missing ROTATION in instancing extension"))? as usize;
+                    let translation_accessor_index = attributes
+                        .get("TRANSLATION")
+                        .and_then(|v| v.as_u64())
+                        .ok_or_else(|| {
+                            anyhow::anyhow!("Missing TRANSLATION in instancing extension")
+                        })? as usize;
 
-                        let scale_accessor_index = attributes
-                            .get("SCALE")
-                            .and_then(|v| v.as_u64())
-                            .ok_or_else(|| anyhow::anyhow!("Missing SCALE in instancing extension"))? as usize;
+                    let rotation_accessor_index = attributes
+                        .get("ROTATION")
+                        .and_then(|v| v.as_u64())
+                        .ok_or_else(|| {
+                            anyhow::anyhow!("Missing ROTATION in instancing extension")
+                        })? as usize;
 
-                        let translations = Self::read_vec3_accessor(
-                            &document,
-                            &buffers,
-                            translation_accessor_index,
-                        )?;
-                        let rotations =
-                            Self::read_quat_accessor(&document, &buffers, rotation_accessor_index)?;
-                        let scales =
-                            Self::read_vec3_accessor(&document, &buffers, scale_accessor_index)?;
+                    let scale_accessor_index = attributes
+                        .get("SCALE")
+                        .and_then(|v| v.as_u64())
+                        .ok_or_else(|| anyhow::anyhow!("Missing SCALE in instancing extension"))?
+                        as usize;
 
-                        let instances: Vec<InstanceData> = translations
-                            .into_iter()
-                            .zip(rotations.into_iter())
-                            .zip(scales.into_iter())
-                            .map(|((position, rotation), scale)| InstanceData {
-                                position,
-                                rotation,
-                                scale,
-                            })
-                            .collect();
+                    let translations =
+                        Self::read_vec3_accessor(&document, &buffers, translation_accessor_index)?;
+                    let rotations =
+                        Self::read_quat_accessor(&document, &buffers, rotation_accessor_index)?;
+                    let scales =
+                        Self::read_vec3_accessor(&document, &buffers, scale_accessor_index)?;
+
+                    let instances: Vec<InstanceData> = translations
+                        .into_iter()
+                        .zip(rotations.into_iter())
+                        .zip(scales.into_iter())
+                        .map(|((position, rotation), scale)| InstanceData {
+                            position,
+                            rotation,
+                            scale,
+                            dissolve_amount: 0.0,
+                        })
+                        .collect();
 
                     let mesh = Mesh::new(device, &mesh_vertices, &mesh_indices);
                     result.push((mesh, instances));
@@ -655,7 +669,9 @@ impl Mesh
             .nth(accessor_index)
             .ok_or_else(|| anyhow::anyhow!("Invalid accessor index"))?;
 
-        let buffer_view = accessor.view().ok_or_else(|| anyhow::anyhow!("Missing buffer view"))?;
+        let buffer_view = accessor
+            .view()
+            .ok_or_else(|| anyhow::anyhow!("Missing buffer view"))?;
         let buffer = &buffers[buffer_view.buffer().index()];
         let start = buffer_view.offset() + accessor.offset();
         let stride = buffer_view.stride().unwrap_or(12);
@@ -699,7 +715,9 @@ impl Mesh
             .nth(accessor_index)
             .ok_or_else(|| anyhow::anyhow!("Invalid accessor index"))?;
 
-        let buffer_view = accessor.view().ok_or_else(|| anyhow::anyhow!("Missing buffer view"))?;
+        let buffer_view = accessor
+            .view()
+            .ok_or_else(|| anyhow::anyhow!("Missing buffer view"))?;
         let buffer = &buffers[buffer_view.buffer().index()];
         let start = buffer_view.offset() + accessor.offset();
         let stride = buffer_view.stride().unwrap_or(16);

src/player.rs

@@ -1,4 +1,4 @@
-use std::rc::Rc;
+use std::{f32::consts::PI, rc::Rc};
 
 use glam::Vec3;
 use kurbo::ParamCurve;
@@ -10,7 +10,8 @@ use rapier3d::{
 
 use crate::{
     components::{
-        jump::JumpComponent, InputComponent, MeshComponent, MovementComponent, PhysicsComponent,
+        jump::JumpComponent, lights::spot::SpotlightComponent, InputComponent, MeshComponent,
+        MovementComponent, PhysicsComponent,
     },
     entity::EntityHandle,
     mesh::Mesh,
@@ -24,14 +25,14 @@ pub struct Player;
 
 impl Player
 {
-    pub fn spawn(world: &mut World) -> EntityHandle
+    pub fn spawn(world: &mut World, position: Vec3) -> EntityHandle
     {
         let entity = world.spawn();
 
-        let initial_position = Vec3::new(0.0, 5.0, 0.0);
+        let spawn_transform = Transform::from_position(position);
 
         let rigidbody = RigidBodyBuilder::kinematic_position_based()
-            .translation(initial_position.into())
+            .translation(spawn_transform.position.into())
             .build();
         let collider = ColliderBuilder::capsule_y(0.5, 0.5).build();
         let _controller = KinematicCharacterController {
@@ -163,7 +164,7 @@ impl Player
 
         world
             .transforms
-            .insert(entity, Transform::from_position(initial_position));
+            .insert(entity, spawn_transform);
         world.movements.insert(entity, MovementComponent::new());
         world.jumps.insert(entity, JumpComponent::new());
         world.inputs.insert(entity, InputComponent::default());
@@ -178,7 +179,7 @@ impl Player
             entity,
             MeshComponent {
                 mesh: Rc::new(mesh),
-                pipeline: Pipeline::Render,
+                pipeline: Pipeline::Standard,
                 instance_buffer: None,
                 num_instances: 1,
             },
@@ -186,6 +187,18 @@ impl Player
         world.player_tags.insert(entity);
         world.state_machines.insert(entity, state_machine);
 
+        let outer_angle = PI / 2.0 * 0.9;
+        world.spotlights.insert(
+            entity,
+            SpotlightComponent::new(
+                Vec3::new(1.0, 2.0, 1.0),
+                Vec3::new(0.0, -1.0, 0.0),
+                100.0,
+                outer_angle * 0.5,
+                outer_angle,
+            ),
+        );
+
         entity
     }
 
@@ -233,7 +246,8 @@ impl State for PlayerFallingState
             .flatten()
             .unwrap();
 
-        let terrain_height = PhysicsManager::get_terrain_height_at(current_pos.x, current_pos.z);
+        let next_pos = current_pos + velocity;
+        let terrain_height = PhysicsManager::get_terrain_height_at(next_pos.x, next_pos.z);
 
         let is_grounded = if let Some(height) = terrain_height
         {
@@ -553,7 +567,8 @@ impl State for PlayerJumpingState
         let current_time = Time::get_time_elapsed();
 
         world.jumps.with_mut(self.entity, |jump| {
-            jump.jump_config.jump_context.duration = current_time - jump.jump_config.jump_context.execution_time;
+            jump.jump_config.jump_context.duration =
+                current_time - jump.jump_config.jump_context.execution_time;
         });
 
         let jump_config = world

src/postprocess.rs

@@ -147,7 +147,7 @@ pub fn create_blit_pipeline(
 ) -> wgpu::RenderPipeline
 {
     let shader_source =
-        std::fs::read_to_string("shaders/blit.wgsl").expect("Failed to read blit shader");
+        std::fs::read_to_string("src/shaders/blit.wgsl").expect("Failed to read blit shader");
 
     let shader = device.create_shader_module(wgpu::ShaderModuleDescriptor {
         label: Some("Blit Shader"),

src/shader.rs

@@ -1,4 +1,5 @@
 use crate::mesh::{InstanceRaw, Vertex};
+use wesl::{include_wesl, Wesl};
 
 pub fn create_render_pipeline(
     device: &wgpu::Device,
@@ -6,11 +7,12 @@ pub fn create_render_pipeline(
     bind_group_layout: &wgpu::BindGroupLayout,
 ) -> wgpu::RenderPipeline
 {
-    let shared_source =
-        std::fs::read_to_string("shaders/shared.wgsl").expect("Failed to read shared shader");
-    let standard_source =
-        std::fs::read_to_string("shaders/standard.wgsl").expect("Failed to read standard shader");
-    let shader_source = format!("{}\n{}", shared_source, standard_source);
+    let compiler = Wesl::new("src/shaders");
+    let shader_source = compiler
+        .compile(&"package::standard".parse().unwrap())
+        .inspect_err(|e| eprintln!("WESL error: {e}"))
+        .unwrap()
+        .to_string();
 
     let shader = device.create_shader_module(wgpu::ShaderModuleDescriptor {
         label: Some("Shader"),
@@ -67,3 +69,72 @@ pub fn create_render_pipeline(
         cache: None,
     })
 }
+
+pub fn create_environment_pipeline(
+    device: &wgpu::Device,
+    config: &wgpu::SurfaceConfiguration,
+    bind_group_layout: &wgpu::BindGroupLayout,
+) -> wgpu::RenderPipeline
+{
+    let compiler = Wesl::new("src/shaders");
+    let shader_source = compiler
+        .compile(&"package::environment".parse().unwrap())
+        .inspect_err(|e| eprintln!("WESL error: {e}"))
+        .unwrap()
+        .to_string();
+
+    let shader = device.create_shader_module(wgpu::ShaderModuleDescriptor {
+        label: Some("Environment Shader"),
+        source: wgpu::ShaderSource::Wgsl(shader_source.into()),
+    });
+
+    let render_pipeline_layout = device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
+        label: Some("Environment Pipeline Layout"),
+        bind_group_layouts: &[bind_group_layout],
+        push_constant_ranges: &[],
+    });
+
+    device.create_render_pipeline(&wgpu::RenderPipelineDescriptor {
+        label: Some("Environment Pipeline"),
+        layout: Some(&render_pipeline_layout),
+        vertex: wgpu::VertexState {
+            module: &shader,
+            entry_point: Some("vs_main"),
+            buffers: &[Vertex::desc(), InstanceRaw::desc()],
+            compilation_options: Default::default(),
+        },
+        fragment: Some(wgpu::FragmentState {
+            module: &shader,
+            entry_point: Some("fs_main"),
+            targets: &[Some(wgpu::ColorTargetState {
+                format: config.format,
+                blend: Some(wgpu::BlendState::REPLACE),
+                write_mask: wgpu::ColorWrites::ALL,
+            })],
+            compilation_options: Default::default(),
+        }),
+        primitive: wgpu::PrimitiveState {
+            topology: wgpu::PrimitiveTopology::TriangleList,
+            strip_index_format: None,
+            front_face: wgpu::FrontFace::Ccw,
+            cull_mode: Some(wgpu::Face::Back),
+            polygon_mode: wgpu::PolygonMode::Fill,
+            unclipped_depth: false,
+            conservative: false,
+        },
+        depth_stencil: Some(wgpu::DepthStencilState {
+            format: wgpu::TextureFormat::Depth32Float,
+            depth_write_enabled: true,
+            depth_compare: wgpu::CompareFunction::Less,
+            stencil: wgpu::StencilState::default(),
+            bias: wgpu::DepthBiasState::default(),
+        }),
+        multisample: wgpu::MultisampleState {
+            count: 1,
+            mask: !0,
+            alpha_to_coverage_enabled: false,
+        },
+        multiview: None,
+        cache: None,
+    })
+}

src/shaders/environment.wesl

@@ -0,0 +1,95 @@
+import package::shared::{VertexInput, VertexOutput, sample_shadow_map, flowmap_path_lighting_with_shadow, all_spotlights_lighting, uniforms, blue_noise_texture, blue_noise_sampler};
+
+@vertex
+fn vs_main(input: VertexInput) -> VertexOutput {
+    var output: VertexOutput;
+
+    let instance_model = mat4x4<f32>(
+        input.instance_model_0,
+        input.instance_model_1,
+        input.instance_model_2,
+        input.instance_model_3
+    );
+
+    let world_pos = instance_model * vec4<f32>(input.position, 1.0);
+    output.world_position = world_pos.xyz;
+    output.clip_position = uniforms.projection * uniforms.view * world_pos;
+
+    let normal_matrix = mat3x3<f32>(
+        instance_model[0].xyz,
+        instance_model[1].xyz,
+        instance_model[2].xyz
+    );
+    output.world_normal = normalize(normal_matrix * input.normal);
+
+    output.light_space_position = uniforms.light_view_projection * world_pos;
+
+    let instance_position = vec3<f32>(
+        instance_model[3][0],
+        instance_model[3][1],
+        instance_model[3][2]
+    );
+
+    let to_player = uniforms.player_position - uniforms.camera_position;
+    let distance_to_player = length(to_player);
+
+    var dissolve_amount = 0.0;
+
+    if distance_to_player > 0.01 {
+        let ray_dir = to_player / distance_to_player;
+        let ray_origin = uniforms.camera_position;
+
+        let tree_height = 16.0;
+        let occlusion_radius = 6.5;
+
+        let w = instance_position - ray_origin;
+        let projection_t = dot(w, ray_dir);
+
+        if projection_t > 0.0 && projection_t < distance_to_player {
+            let closest_on_ray = ray_origin + ray_dir * projection_t;
+
+            let diff = closest_on_ray - instance_position;
+            let height_on_trunk = clamp(diff.y, 0.0, tree_height);
+            let closest_on_trunk = instance_position + vec3<f32>(0.0, height_on_trunk, 0.0);
+
+            let perp_distance = length(closest_on_trunk - closest_on_ray);
+
+            if perp_distance < occlusion_radius {
+                let dissolve_t = pow(perp_distance / occlusion_radius, 0.5);
+                dissolve_amount = 1.0 - clamp(dissolve_t, 0.0, 1.0);
+            }
+        }
+    }
+
+    output.dissolve_amount = dissolve_amount;
+
+    return output;
+}
+
+@fragment
+fn fs_main(input: VertexOutput) -> @location(0) vec4<f32> {
+    
+    let debug = 0u;
+
+    if debug == 1u {
+        return vec4<f32>(input.dissolve_amount);
+    }
+
+    if input.dissolve_amount > 0.0 {
+        let screen_pos = input.clip_position.xy;
+        let noise_uv = fract(screen_pos / 128.0);
+        let noise_value = textureSampleLevel(blue_noise_texture, blue_noise_sampler, noise_uv, 0.0).r;
+
+        if noise_value < input.dissolve_amount {
+            discard;
+        }
+    }
+
+    let shadow = sample_shadow_map(input.light_space_position);
+
+    let tile_scale = 4.0;
+    let spotlight_strokes = all_spotlights_lighting(input.world_position, input.clip_position, input.world_normal, tile_scale, shadow);
+    let brightness = spotlight_strokes;
+
+    return vec4<f32>(brightness, brightness, brightness, 1.0);
+}

src/shaders/shadow.wesl

@@ -0,0 +1,14 @@
+import package::shared::{ VertexInput, uniforms };
+
+@vertex
+fn vs_main(input: VertexInput) -> @builtin(position) vec4<f32> {
+    let instance_model = mat4x4<f32>(
+        input.instance_model_0,
+        input.instance_model_1,
+        input.instance_model_2,
+        input.instance_model_3
+    );
+
+    let world_pos = instance_model * vec4<f32>(input.position, 1.0);
+    return uniforms.light_view_projection * world_pos;
+}

src/shaders/shared.wesl

@@ -6,6 +6,7 @@ struct VertexInput {
     @location(4) instance_model_1: vec4<f32>,
     @location(5) instance_model_2: vec4<f32>,
     @location(6) instance_model_3: vec4<f32>,
+    @location(7) instance_dissolve: f32,
 }
 
 struct VertexOutput {
@@ -13,6 +14,24 @@ struct VertexOutput {
     @location(0) world_position: vec3<f32>,
     @location(1) world_normal: vec3<f32>,
     @location(2) light_space_position: vec4<f32>,
+    @location(3) dissolve_amount: f32,
+}
+
+const MAX_SPOTLIGHTS: u32 = 4u;
+
+struct Spotlight {
+    position: vec3<f32>,
+    inner_angle: f32,
+    direction: vec3<f32>,
+    outer_angle: f32,
+    range: f32,
+    _padding: f32,
+    _padding2: f32,
+    _padding3: f32,
+    _padding4: f32,
+    _padding5: f32,
+    _padding6: f32,
+    _padding7: f32,
 }
 
 struct Uniforms {
@@ -22,9 +41,13 @@ struct Uniforms {
     light_view_projection: mat4x4<f32>,
     camera_position: vec3<f32>,
     height_scale: f32,
+    player_position: vec3<f32>,
     time: f32,
     shadow_bias: f32,
-    light_direction: vec3<f32>,
+    spotlight_count: u32,
+    _padding1: u32,
+    _padding2: u32,
+    spotlights: array<Spotlight, 4>,
 }
 
 @group(0) @binding(0)
@@ -48,6 +71,12 @@ var flowmap_texture: texture_2d<f32>;
 @group(0) @binding(6)
 var flowmap_sampler: sampler;
 
+@group(0) @binding(7)
+var blue_noise_texture: texture_2d<f32>;
+
+@group(0) @binding(8)
+var blue_noise_sampler: sampler;
+
 const PI: f32 = 3.14159265359;
 const TERRAIN_BOUNDS: vec2<f32> = vec2<f32>(1000.0, 1000.0);
 const LINE_THICKNESS: f32 = 0.1;
@@ -91,9 +120,7 @@ fn sample_shadow_map(light_space_pos: vec4<f32>) -> f32 {
     let proj_coords = light_space_pos.xyz / light_space_pos.w;
     let ndc_coords = proj_coords * vec3<f32>(0.5, -0.5, 1.0) + vec3<f32>(0.5, 0.5, 0.0);
 
-    if ndc_coords.x < 0.0 || ndc_coords.x > 1.0 ||
-       ndc_coords.y < 0.0 || ndc_coords.y > 1.0 ||
-       ndc_coords.z < 0.0 || ndc_coords.z > 1.0 {
+    if ndc_coords.x < 0.0 || ndc_coords.x > 1.0 || ndc_coords.y < 0.0 || ndc_coords.y > 1.0 || ndc_coords.z < 0.0 || ndc_coords.z > 1.0 {
         return 1.0;
     }
 
@@ -103,7 +130,20 @@ fn sample_shadow_map(light_space_pos: vec4<f32>) -> f32 {
     return shadow;
 }
 
-fn hatching_lighting(world_pos: vec3<f32>, tile_scale: f32, direction: vec2<f32>, distance: f32) -> f32 {
+fn hatching_lighting(world_pos: vec3<f32>, clip_pos: vec4<f32>, tile_scale: f32, direction: vec2<f32>, distance: f32) -> f32 {
+    let octave_index = round((1.0 - pow(distance, 2.0)) * OCTAVE_STEPS);
+    let octave_normalized = octave_index / OCTAVE_STEPS;
+
+    if octave_index > 3.0 {
+        return 1.0;
+    } else if octave_index < 1.0 {
+        let screen_pos = clip_pos.xy / clip_pos.w;
+        let blue_noise_uv = screen_pos * 0.5 + 0.5;
+        let blue_noise = textureSample(blue_noise_texture, blue_noise_sampler, blue_noise_uv * 10.0).r;
+        return step(blue_noise, 0.05);
+    }
+
+
     let world_pos_2d = vec2<f32>(world_pos.x, world_pos.z);
     let tile_size = 1.0 / tile_scale;
     let base_tile_center = floor(world_pos_2d / tile_size) * tile_size + tile_size * 0.5;
@@ -119,8 +159,6 @@ fn hatching_lighting(world_pos: vec3<f32>, tile_scale: f32, direction: vec2<f32>
             let parallel = mix(perpendicular_to_light, direction, t / 2.0);
             let perpendicular = compute_perpendicular(parallel);
 
-            let octave_index = round((1.0 - pow(distance, 2.0)) * OCTAVE_STEPS);
-
             let spacing = LINE_THICKNESS * 1.5;
 
             var max_offset: i32;
@@ -135,7 +173,7 @@ fn hatching_lighting(world_pos: vec3<f32>, tile_scale: f32, direction: vec2<f32>
                     max_offset = 9;
                 }
                 case 1 {
-                    max_offset = 9;
+                    max_offset = 6;
                 }
             }
             for (var i: i32 = -max_offset; i <= max_offset; i++) {
@@ -173,7 +211,7 @@ fn hatching_lighting(world_pos: vec3<f32>, tile_scale: f32, direction: vec2<f32>
                     local_pos,
                 );
 
-                let lighting = line_stroke_lighting(stroke_data);
+                let lighting = line_stroke_lighting(stroke_data, clip_pos);
                 min_lighting = min(min_lighting, lighting);
             }
         }
@@ -182,48 +220,94 @@ fn hatching_lighting(world_pos: vec3<f32>, tile_scale: f32, direction: vec2<f32>
     return min_lighting;
 }
 
-fn point_lighting(world_pos: vec3<f32>, point_light: vec3<f32>, tile_scale: f32) -> f32 {
-    let world_pos_2d = vec2<f32>(world_pos.x, world_pos.z);
-    let light_pos_2d = vec2<f32>(point_light.x, point_light.z);
-    let tile_size = 1.0 / tile_scale;
-    let tile_center = floor(world_pos_2d / tile_size) * tile_size + tile_size * 0.5;
-
-    let direction_to_point = light_pos_2d - tile_center;
-    let distance_to_point = min(length(direction_to_point) / 60.0, 1.0);
-    let direction_normalized = normalize(direction_to_point);
-
-    return hatching_lighting(world_pos, tile_scale, direction_normalized, distance_to_point);
+struct SpotlightData {
+    direction_normalized: vec2<f32>,
+    combined_distance: f32,
+    is_lit: bool,
 }
 
-fn point_lighting_with_shadow(world_pos: vec3<f32>, normal: vec3<f32>, point_light: vec3<f32>, tile_scale: f32, shadow: f32) -> f32 {
-    let world_pos_2d = vec2<f32>(world_pos.x, world_pos.z);
-    let light_pos_2d = vec2<f32>(point_light.x, point_light.z);
-    let tile_size = 1.0 / tile_scale;
-    let tile_center = floor(world_pos_2d / tile_size) * tile_size + tile_size * 0.5;
+fn calculate_spotlight_data(world_pos: vec3<f32>, normal: vec3<f32>, spotlight: Spotlight, tile_scale: f32, shadow: f32) -> SpotlightData {
+    var data: SpotlightData;
+    data.is_lit = false;
+    data.direction_normalized = vec2<f32>(0.0, 0.0);
+    data.combined_distance = 2.0;
 
-    let direction_to_point_3d = normalize(point_light - world_pos);
-    let diffuse = max(0.0, dot(normalize(normal), direction_to_point_3d));
+    let to_fragment = normalize(world_pos - spotlight.position);
+    let angle_to_fragment = acos(dot(to_fragment, spotlight.direction));
 
-    let direction_to_point = light_pos_2d - tile_center;
-    let distance_to_point = min(length(direction_to_point) / 60.0, 1.0);
-    let direction_normalized = normalize(direction_to_point);
+    if angle_to_fragment > spotlight.outer_angle {
+        return data;
+    }
 
-    let lighting_intensity = shadow * diffuse;
+    let cube_size = 1.0 / tile_scale;
+    let cube_center = vec3<f32>(
+        floor(world_pos.x / cube_size) * cube_size + cube_size * 0.5,
+        floor(world_pos.y / cube_size) * cube_size + cube_size * 0.5,
+        floor(world_pos.z / cube_size) * cube_size + cube_size * 0.5
+    );
+    let tile_center = vec2<f32>(cube_center.x, cube_center.z);
+
+    let angular_falloff = smoothstep(spotlight.inner_angle, spotlight.outer_angle, angle_to_fragment);
+
+    let direction_to_point_3d = normalize(spotlight.position - cube_center);
+    let diffuse_raw = max(0.0, dot(normalize(normal), direction_to_point_3d));
+    let diffuse_res = 4.0;
+    let diffuse = floor(diffuse_raw * diffuse_res) / diffuse_res;
+
+    let t = (cube_center.y - spotlight.position.y) / spotlight.direction.y;
+    let hit_point = spotlight.position + spotlight.direction * t;
+    let hit_point_2d = vec2<f32>(hit_point.x, hit_point.z);
+    let direction_to_hit = hit_point_2d - tile_center;
+    let distance_to_hit = min(length(direction_to_hit) / spotlight.range, 1.0);
+    data.direction_normalized = normalize(direction_to_hit);
+
+    let lighting_intensity = shadow * pow(diffuse, 0.5) * (1.0 - angular_falloff);
     let darkness = 1.0 - lighting_intensity;
-    let combined_distance = min(distance_to_point + darkness * 0.5, 1.0);
+    data.combined_distance = distance_to_hit + darkness;
 
-    return hatching_lighting(world_pos, tile_scale, direction_normalized, combined_distance);
+    data.is_lit = data.combined_distance <= 1.0;
+
+    return data;
 }
 
-fn line_stroke_lighting(data: StrokeData) -> f32 {
-    let octave_normalized = data.octave_index / OCTAVE_STEPS;
+fn is_in_spotlight_light_area(world_pos: vec3<f32>, normal: vec3<f32>, spotlight: Spotlight, tile_scale: f32, shadow: f32) -> bool {
+    return calculate_spotlight_data(world_pos, normal, spotlight, tile_scale, shadow).is_lit;
+}
 
-    if data.octave_index > 3.0 {
-        return 1.0;
-    } else if data.octave_index < 1.0 {
+fn is_in_any_spotlight_light_area(world_pos: vec3<f32>, normal: vec3<f32>, tile_scale: f32, shadow: f32) -> bool {
+    for (var i = 0u; i < uniforms.spotlight_count; i++) {
+        if is_in_spotlight_light_area(world_pos, normal, uniforms.spotlights[i], tile_scale, shadow) {
+            return true;
+        }
+    }
+    return false;
+}
+
+fn spotlight_lighting(world_pos: vec3<f32>, clip_pos: vec4<f32>, normal: vec3<f32>, spotlight: Spotlight, tile_scale: f32, shadow: f32) -> f32 {
+    let data = calculate_spotlight_data(world_pos, normal, spotlight, tile_scale, shadow);
+
+    if !data.is_lit {
         return 0.0;
     }
 
+    return hatching_lighting(world_pos, clip_pos, tile_scale, data.direction_normalized, data.combined_distance);
+}
+
+fn all_spotlights_lighting(world_pos: vec3<f32>, clip_pos: vec4<f32>, normal: vec3<f32>, tile_scale: f32, shadow: f32) -> f32 {
+    var max_lighting = 0.0;
+
+    for (var i = 0u; i < uniforms.spotlight_count; i++) {
+        let spotlight = uniforms.spotlights[i];
+        let lighting = spotlight_lighting(world_pos, clip_pos, normal, spotlight, tile_scale, shadow);
+        max_lighting = max(max_lighting, lighting);
+    }
+
+    return max_lighting;
+}
+
+fn line_stroke_lighting(data: StrokeData, clip_pos: vec4<f32>) -> f32 {
+    let octave_normalized = data.octave_index / OCTAVE_STEPS;
+
     let noise = hash2(data.tile_center + data.offset) * 2.0 - 1.0;
 
     var noise_at_octave = noise;
@@ -249,7 +333,7 @@ fn line_stroke_lighting(data: StrokeData) -> f32 {
     let parallel_coord = dot(data.local_pos, line);
     let perpendicular_coord = dot(data.local_pos, perpendicular_to_line);
 
-    let line_half_width = LINE_THICKNESS * (1.0 - octave_normalized * 0.5);
+    let line_half_width = LINE_THICKNESS * (1.0 - octave_normalized * 0.5) * data.tile_size;
     let straight_section_half_length = max(0.0, data.tile_size * 0.4 - line_half_width);
 
     let parallel_jitter = (rand(data.tile_center + data.offset * 123.456) * 2.0 - 1.0) * data.tile_size * jitter;
@@ -261,7 +345,7 @@ fn line_stroke_lighting(data: StrokeData) -> f32 {
     return step(line_half_width, effective_distance);
 }
 
-fn flowmap_path_lighting(world_pos: vec3<f32>, tile_scale: f32) -> f32 {
+fn flowmap_path_lighting(world_pos: vec3<f32>, clip_pos: vec4<f32>, tile_scale: f32) -> f32 {
     let world_pos_2d = vec2<f32>(world_pos.x, world_pos.z);
     let tile_size = 1.0 / tile_scale;
     let tile_center = floor(world_pos_2d / tile_size) * tile_size + tile_size * 0.5;
@@ -273,10 +357,10 @@ fn flowmap_path_lighting(world_pos: vec3<f32>, tile_scale: f32) -> f32 {
     let direction_to_path = normalize(vec2<f32>(x, y));
     let distance_to_path = flowmap_sample.b;
 
-    return hatching_lighting(world_pos, tile_scale, direction_to_path, distance_to_path);
+    return hatching_lighting(world_pos, clip_pos, tile_scale, direction_to_path, distance_to_path);
 }
 
-fn flowmap_path_lighting_with_shadow(world_pos: vec3<f32>, normal: vec3<f32>, tile_scale: f32, shadow: f32) -> f32 {
+fn flowmap_path_lighting_with_shadow(world_pos: vec3<f32>, clip_pos: vec4<f32>, normal: vec3<f32>, tile_scale: f32, shadow: f32) -> f32 {
     let world_pos_2d = vec2<f32>(world_pos.x, world_pos.z);
     let tile_size = 1.0 / tile_scale;
     let tile_center = floor(world_pos_2d / tile_size) * tile_size + tile_size * 0.5;
@@ -295,5 +379,5 @@ fn flowmap_path_lighting_with_shadow(world_pos: vec3<f32>, normal: vec3<f32>, ti
     let darkness = 1.0 - lighting_intensity;
     let combined_distance = min(distance_to_path + darkness * 0.5, 1.0);
 
-    return hatching_lighting(world_pos, tile_scale, direction_to_path, combined_distance);
+    return hatching_lighting(world_pos, clip_pos, tile_scale, direction_to_path, combined_distance);
 }

src/shaders/snow.wesl

@@ -0,0 +1,72 @@
+import package::shared::{
+    VertexInput,
+    VertexOutput,
+    uniforms,
+    sample_shadow_map,
+    all_spotlights_lighting,
+    is_in_any_spotlight_light_area,
+    blue_noise_texture,
+    blue_noise_sampler,
+    TERRAIN_BOUNDS,
+    Spotlight
+};
+
+@group(1) @binding(0)
+var persistent_light_texture: texture_2d<f32>;
+
+@group(1) @binding(1)
+var persistent_light_sampler: sampler;
+
+@vertex
+fn vs_main(input: VertexInput) -> VertexOutput {
+    var output: VertexOutput;
+
+    let instance_model = mat4x4<f32>(
+        input.instance_model_0,
+        input.instance_model_1,
+        input.instance_model_2,
+        input.instance_model_3
+    );
+
+    let world_pos = instance_model * vec4<f32>(input.position, 1.0);
+    output.world_position = world_pos.xyz;
+    output.clip_position = uniforms.projection * uniforms.view * world_pos;
+
+    let normal_matrix = mat3x3<f32>(
+        instance_model[0].xyz,
+        instance_model[1].xyz,
+        instance_model[2].xyz
+    );
+    output.world_normal = normalize(normal_matrix * input.normal);
+
+    output.light_space_position = uniforms.light_view_projection * world_pos;
+
+    return output;
+}
+
+@fragment
+fn fs_main(in: VertexOutput) -> @location(0) vec4<f32> {
+    let shadow = sample_shadow_map(in.light_space_position);
+
+    let tile_scale = 2.0;
+    let in_spotlight_light_area = is_in_any_spotlight_light_area(in.world_position, in.world_normal, tile_scale, shadow);
+    let spotlight_strokes = all_spotlights_lighting(in.world_position, in.clip_position, in.world_normal, tile_scale, shadow);
+
+    var brightness = spotlight_strokes;
+
+    if !in_spotlight_light_area {
+        let terrain_uv = (vec2<f32>(in.world_position.x, in.world_position.z) + TERRAIN_BOUNDS * 0.5) / TERRAIN_BOUNDS;
+        let persistent_light = textureSample(persistent_light_texture, persistent_light_sampler, terrain_uv).r;
+
+        if persistent_light > 0.05 {
+            let screen_pos = in.clip_position.xy / in.clip_position.w;
+            let blue_noise_uv = screen_pos * 0.5 + 0.5;
+            let blue_noise = textureSample(blue_noise_texture, blue_noise_sampler, blue_noise_uv * 10.0).r;
+            let blue_step = step(blue_noise, persistent_light / 30.0);
+
+            brightness = max(brightness, blue_step);
+        }
+    }
+
+    return vec4<f32>(brightness, brightness, brightness, 1.0);
+}

src/shaders/snow_deform.wgsl

@@ -0,0 +1,44 @@
+@group(0) @binding(0)
+var snow_depth: texture_storage_2d<r32float, read_write>;
+
+@group(0) @binding(1)
+var<uniform> params: DeformParams;
+
+struct DeformParams {
+    position_x: f32,
+    position_z: f32,
+    radius: f32,
+    depth: f32,
+}
+
+@compute @workgroup_size(16, 16, 1)
+fn deform(@builtin(global_invocation_id) global_id: vec3<u32>) {
+    let texture_size = textureDimensions(snow_depth);
+
+    if (global_id.x >= texture_size.x || global_id.y >= texture_size.y) {
+        return;
+    }
+
+    let coords = vec2<i32>(i32(global_id.x), i32(global_id.y));
+
+    let terrain_size = vec2<f32>(1000.0, 1000.0);
+    let half_size = terrain_size / 2.0;
+
+    let uv = vec2<f32>(f32(global_id.x) / f32(texture_size.x), f32(global_id.y) / f32(texture_size.y));
+    let world_pos = uv * terrain_size - half_size;
+
+    let deform_center = vec2<f32>(params.position_x, params.position_z);
+    let distance = length(world_pos - deform_center);
+
+    if (distance < params.radius) {
+        let current_depth = textureLoad(snow_depth, coords).r;
+
+        let falloff = 1.0 - (distance / params.radius);
+        let falloff_smooth = falloff * falloff;
+
+        let deform_amount = params.depth * falloff_smooth;
+        let new_depth = max(0.0, current_depth - deform_amount);
+
+        textureStore(snow_depth, coords, vec4<f32>(new_depth, 0.0, 0.0, 0.0));
+    }
+}

src/shaders/snow_light_accumulation.wesl

@@ -0,0 +1,117 @@
+import package::shared::{Spotlight, MAX_SPOTLIGHTS, calculate_spotlight_data};
+
+struct AccumulationUniforms {
+    terrain_min_xz: vec2<f32>,
+    terrain_max_xz: vec2<f32>,
+    decay_rate: f32,
+    delta_time: f32,
+    spotlight_count: u32,
+    _padding: u32,
+    light_view_projection: mat4x4<f32>,
+    shadow_bias: f32,
+    terrain_height_scale: f32,
+    _padding3: f32,
+    _padding4: f32,
+    spotlights: array<Spotlight, 4>,
+}
+
+@group(0) @binding(0)
+var previous_light: texture_2d<f32>;
+
+@group(0) @binding(1)
+var light_sampler: sampler;
+
+@group(0) @binding(2)
+var<uniform> uniforms: AccumulationUniforms;
+
+@group(0) @binding(3)
+var heightmap: texture_2d<f32>;
+
+@group(0) @binding(4)
+var heightmap_sampler: sampler;
+
+@group(0) @binding(5)
+var shadow_map: texture_depth_2d;
+
+@group(0) @binding(6)
+var shadow_sampler: sampler_comparison;
+
+@group(0) @binding(7)
+var snow_depth: texture_2d<f32>;
+
+@group(0) @binding(8)
+var snow_depth_sampler: sampler;
+
+struct VertexOutput {
+    @builtin(position) position: vec4<f32>,
+    @location(0) uv: vec2<f32>,
+}
+
+@vertex
+fn vs_main(@builtin(vertex_index) vertex_index: u32) -> VertexOutput {
+    var out: VertexOutput;
+
+    let x = f32((vertex_index << 1u) & 2u);
+    let y = f32(vertex_index & 2u);
+    out.position = vec4<f32>(x * 2.0 - 1.0, y * 2.0 - 1.0, 0.0, 1.0);
+    out.uv = vec2<f32>(x, 1.0 - y);
+
+    return out;
+}
+
+fn sample_shadow_map(light_space_pos: vec4<f32>) -> f32 {
+    let proj_coords = light_space_pos.xyz / light_space_pos.w;
+    let ndc_coords = proj_coords * vec3<f32>(0.5, -0.5, 1.0) + vec3<f32>(0.5, 0.5, 0.0);
+
+    if ndc_coords.x < 0.0 || ndc_coords.x > 1.0 ||
+       ndc_coords.y < 0.0 || ndc_coords.y > 1.0 ||
+       ndc_coords.z < 0.0 || ndc_coords.z > 1.0 {
+        return 1.0;
+    }
+
+    let depth = ndc_coords.z - uniforms.shadow_bias;
+    let shadow = textureSampleCompare(shadow_map, shadow_sampler, ndc_coords.xy, depth);
+
+    return shadow;
+}
+
+@fragment
+fn fs_main(in: VertexOutput) -> @location(0) vec4<f32> {
+    let prev_light = textureSample(previous_light, light_sampler, in.uv).r;
+
+    let world_xz = mix(uniforms.terrain_min_xz, uniforms.terrain_max_xz, in.uv);
+    let terrain_height = textureSampleLevel(heightmap, heightmap_sampler, in.uv, 0.0).r * uniforms.terrain_height_scale;
+    let depth = textureSampleLevel(snow_depth, snow_depth_sampler, in.uv, 0.0).r;
+    let snow_surface_height = terrain_height + depth;
+    let snow_surface_pos = vec3<f32>(world_xz.x, snow_surface_height, world_xz.y);
+
+    let light_space_position = uniforms.light_view_projection * vec4<f32>(snow_surface_pos, 1.0);
+    let shadow = sample_shadow_map(light_space_position);
+
+    var current_light = 0.0;
+    if shadow > 0.0 {
+        let tile_scale = 2.0;
+        let surface_normal = vec3<f32>(0.0, 1.0, 0.0);
+
+        for (var i = 0u; i < uniforms.spotlight_count; i++) {
+            let spotlight = uniforms.spotlights[i];
+            let data = calculate_spotlight_data(snow_surface_pos, surface_normal, spotlight, tile_scale, shadow);
+            let light = f32(data.is_lit);
+            current_light = max(current_light, light);
+        }
+    }
+
+    var accumulated: f32;
+    if current_light > 0.01 {
+        accumulated = current_light;
+    } else {
+        let decay_factor = exp(-uniforms.decay_rate * uniforms.delta_time * 60.0);
+        accumulated = prev_light * decay_factor;
+
+        if accumulated < 0.01 {
+            accumulated = 0.0;
+        }
+    }
+
+    return vec4<f32>(accumulated, 0.0, 0.0, 1.0);
+}

src/shaders/standard.wesl

@@ -0,0 +1,66 @@
+import package::shared::{VertexInput, VertexOutput, sample_shadow_map, flowmap_path_lighting_with_shadow, all_spotlights_lighting, uniforms, blue_noise_texture, blue_noise_sampler};
+
+@vertex
+fn vs_main(input: VertexInput) -> VertexOutput {
+    var output: VertexOutput;
+
+    let instance_model = mat4x4<f32>(
+        input.instance_model_0,
+        input.instance_model_1,
+        input.instance_model_2,
+        input.instance_model_3
+    );
+
+    let world_pos = instance_model * vec4<f32>(input.position, 1.0);
+    output.world_position = world_pos.xyz;
+    output.clip_position = uniforms.projection * uniforms.view * world_pos;
+
+    let normal_matrix = mat3x3<f32>(
+        instance_model[0].xyz,
+        instance_model[1].xyz,
+        instance_model[2].xyz
+    );
+    output.world_normal = normalize(normal_matrix * input.normal);
+
+    output.light_space_position = uniforms.light_view_projection * world_pos;
+    output.dissolve_amount = 0.0;
+
+    return output;
+}
+
+@fragment
+fn fs_main(input: VertexOutput) -> @location(0) vec4<f32> {
+    let shadow = sample_shadow_map(input.light_space_position);
+
+    let debug = 0u;
+
+    if debug == 3u {
+        return vec4<f32>(shadow, shadow, shadow, 1.0);
+    }
+
+    if debug == 2u {
+        let proj_coords = input.light_space_position.xyz / input.light_space_position.w;
+        return vec4<f32>(proj_coords.x, proj_coords.y, proj_coords.z, 1.0);
+    }
+
+    if debug == 1u {
+        let proj_coords = input.light_space_position.xyz / input.light_space_position.w;
+        let ndc_coords = proj_coords * vec3<f32>(0.5, -0.5, 1.0) + vec3<f32>(0.5, 0.5, 0.0);
+        let in_bounds = ndc_coords.x >= 0.0 && ndc_coords.x <= 1.0 &&
+                       ndc_coords.y >= 0.0 && ndc_coords.y <= 1.0 &&
+                       ndc_coords.z >= 0.0 && ndc_coords.z <= 1.0;
+        if in_bounds {
+            return vec4<f32>(ndc_coords.x, ndc_coords.y, ndc_coords.z, 1.0);
+        } else {
+            return vec4<f32>(0.0, 0.0, 0.0, 1.0);
+        }
+    }
+
+    let tile_scale = 4.0;
+    let flowmap_strokes = flowmap_path_lighting_with_shadow(input.world_position, input.clip_position, input.world_normal, tile_scale, shadow);
+    let spotlight_strokes = all_spotlights_lighting(input.world_position, input.clip_position, input.world_normal, tile_scale, shadow);
+    // let brightness = max(flowmap_strokes, spotlight_strokes);
+    let brightness = 0.0;
+
+    return vec4<f32>(brightness, brightness, brightness, 1.0);
+}

src/shaders/terrain.wesl

@@ -1,3 +1,5 @@
+import package::shared::{VertexInput, VertexOutput, sample_shadow_map, flowmap_path_lighting_with_shadow, all_spotlights_lighting, uniforms, TERRAIN_BOUNDS, flowmap_texture, flowmap_sampler};
+
 @vertex
 fn vs_main(input: VertexInput) -> VertexOutput {
     var output: VertexOutput;
@@ -29,6 +31,24 @@ fn vs_main(input: VertexInput) -> VertexOutput {
 fn fs_main(input: VertexOutput) -> @location(0) vec4<f32> {
     let debug = 0u;
 
+    if debug == 4u {
+        let proj_coords = input.light_space_position.xyz / input.light_space_position.w;
+        let ndc_coords = proj_coords * vec3<f32>(0.5, -0.5, 1.0) + vec3<f32>(0.5, 0.5, 0.0);
+        let in_bounds = ndc_coords.x >= 0.0 && ndc_coords.x <= 1.0 &&
+                       ndc_coords.y >= 0.0 && ndc_coords.y <= 1.0 &&
+                       ndc_coords.z >= 0.0 && ndc_coords.z <= 1.0;
+        if in_bounds {
+            return vec4<f32>(ndc_coords.x, ndc_coords.y, ndc_coords.z, 1.0);
+        } else {
+            return vec4<f32>(0.0, 0.0, 0.0, 1.0);
+        }
+    }
+
+    if debug == 3u {
+        let shadow = sample_shadow_map(input.light_space_position);
+        return vec4<f32>(shadow, shadow, shadow, 1.0);
+    }
+
     if debug == 1u {
         let flowmap_uv = (vec2<f32>(input.world_position.x, input.world_position.z) + TERRAIN_BOUNDS * 0.5) / TERRAIN_BOUNDS;
         let flowmap_sample = textureSampleLevel(flowmap_texture, flowmap_sampler, flowmap_uv, 0.0).rgb;
@@ -61,10 +81,9 @@ fn fs_main(input: VertexOutput) -> @location(0) vec4<f32> {
 
     let shadow = sample_shadow_map(input.light_space_position);
 
-    let tile_scale = 1.0;
-    let flowmap_strokes = flowmap_path_lighting_with_shadow(input.world_position, input.world_normal, tile_scale, shadow);
-    let point_strokes = point_lighting_with_shadow(input.world_position, input.world_normal, vec3<f32>(0.0, 100.0, 0.0), tile_scale, shadow);
-    let brightness = max(flowmap_strokes, point_strokes);
+    let tile_scale = 2.0;
+    let spotlight_strokes = all_spotlights_lighting(input.world_position, input.clip_position, input.world_normal, tile_scale, shadow);
+    let brightness = spotlight_strokes;
 
     return vec4<f32>(brightness, brightness, brightness, 1.0);
 }

src/snow.rs

@@ -0,0 +1,451 @@
+use std::rc::Rc;
+
+use exr::prelude::{ReadChannels, ReadLayers};
+use glam::{Vec2, Vec3};
+use wgpu::util::DeviceExt;
+
+use crate::{
+    components::MeshComponent,
+    entity::EntityHandle,
+    mesh::{Mesh, Vertex},
+    render,
+    world::{Transform, World},
+};
+
+pub struct SnowConfig
+{
+    pub depth_map_path: String,
+    pub heightmap_path: String,
+    pub terrain_size: Vec2,
+    pub resolution: (u32, u32),
+}
+
+impl SnowConfig
+{
+    pub fn new(depth_map_path: &str, heightmap_path: &str, terrain_size: Vec2, resolution: (u32, u32)) -> Self
+    {
+        Self {
+            depth_map_path: depth_map_path.to_string(),
+            heightmap_path: heightmap_path.to_string(),
+            terrain_size,
+            resolution,
+        }
+    }
+
+    pub fn default() -> Self
+    {
+        Self {
+            depth_map_path: "textures/snow_depth.exr".to_string(),
+            heightmap_path: "textures/terrain_heightmap.exr".to_string(),
+            terrain_size: Vec2::new(1000.0, 1000.0),
+            resolution: (1000, 1000),
+        }
+    }
+}
+
+pub struct SnowLayer
+{
+    pub entity: EntityHandle,
+    pub depth_texture: wgpu::Texture,
+    pub depth_texture_view: wgpu::TextureView,
+    pub depth_bind_group: wgpu::BindGroup,
+    pub width: u32,
+    pub height: u32,
+    pub deform_bind_group: wgpu::BindGroup,
+    pub deform_pipeline: wgpu::ComputePipeline,
+    pub deform_params_buffer: wgpu::Buffer,
+}
+
+impl SnowLayer
+{
+    pub fn load(world: &mut World, config: &SnowConfig) -> anyhow::Result<Self>
+    {
+        println!("\n=== Loading Snow Layer ===");
+        println!("Depth map path: {}", config.depth_map_path);
+        println!("Heightmap path: {}", config.heightmap_path);
+        println!("Terrain size: {:?}", config.terrain_size);
+
+        let (depth_data, width, height) = Self::load_depth_map(&config.depth_map_path)?;
+        let (heightmap_data, hm_width, hm_height) = Self::load_depth_map(&config.heightmap_path)?;
+
+        if width != hm_width || height != hm_height {
+            anyhow::bail!("Snow depth map ({}×{}) and heightmap ({}×{}) dimensions don't match!",
+                width, height, hm_width, hm_height);
+        }
+
+        println!("Using EXR dimensions: {}×{}", width, height);
+
+        let (depth_texture, depth_texture_view, depth_bind_group) =
+            Self::create_depth_texture(&depth_data, width, height);
+
+        let mesh = Self::generate_snow_mesh(&depth_data, &heightmap_data, width, height, config.terrain_size);
+        let num_indices = mesh.num_indices;
+
+        let entity = world.spawn();
+        world.transforms.insert(entity, Transform::IDENTITY);
+
+        if num_indices > 0 {
+            world.meshes.insert(
+                entity,
+                MeshComponent {
+                    mesh: Rc::new(mesh),
+                    pipeline: render::Pipeline::Snow,
+                    instance_buffer: None,
+                    num_instances: 1,
+                },
+            );
+            println!("Snow mesh created with {} indices", num_indices);
+        } else {
+            println!("⚠️  No snow mesh created - all depth values are zero");
+        }
+
+        let (deform_pipeline, deform_bind_group, deform_params_buffer) =
+            Self::create_deform_pipeline(&depth_texture_view);
+
+        Ok(Self {
+            entity,
+            depth_texture,
+            depth_texture_view,
+            depth_bind_group,
+            width,
+            height,
+            deform_bind_group,
+            deform_pipeline,
+            deform_params_buffer,
+        })
+    }
+
+    fn load_depth_map(path: &str) -> anyhow::Result<(Vec<f32>, u32, u32)>
+    {
+        println!("Loading snow depth map from: {}", path);
+
+        let image = exr::prelude::read()
+            .no_deep_data()
+            .largest_resolution_level()
+            .all_channels()
+            .all_layers()
+            .all_attributes()
+            .from_file(path)?;
+
+        let layer = &image.layer_data[0];
+        let width = layer.size.width() as u32;
+        let height = layer.size.height() as u32;
+
+        println!("  Layer size: {}×{}", width, height);
+        println!("  Available channels: {:?}", layer.channel_data.list.iter().map(|c| &c.name).collect::<Vec<_>>());
+
+        let channel = layer.channel_data.list.iter()
+            .find(|c| format!("{:?}", c.name).contains("\"R\""))
+            .or_else(|| layer.channel_data.list.first())
+            .ok_or_else(|| anyhow::anyhow!("No channels found in EXR"))?;
+
+        println!("  Using channel: {:?}", channel.name);
+
+        let depths: Vec<f32> = channel.sample_data.values_as_f32().collect();
+
+        let min_value = depths.iter().cloned().fold(f32::INFINITY, f32::min);
+        let max_value = depths.iter().cloned().fold(f32::NEG_INFINITY, f32::max);
+        let avg_value = depths.iter().sum::<f32>() / depths.len() as f32;
+        let non_zero_count = depths.iter().filter(|&&v| v > 0.0001).count();
+
+        println!("  Total values: {}", depths.len());
+        println!("  Min: {:.6}, Max: {:.6}, Avg: {:.6}", min_value, max_value, avg_value);
+        println!("  Non-zero values: {} ({:.1}%)", non_zero_count, (non_zero_count as f32 / depths.len() as f32) * 100.0);
+
+        if max_value < 0.0001 {
+            println!("  ⚠️  WARNING: All values are effectively zero! Snow depth map may be invalid.");
+        } else {
+            println!("  ✓ Snow depth data loaded successfully");
+        }
+
+        Ok((depths, width, height))
+    }
+
+    fn create_depth_texture(
+        depth_data: &[f32],
+        width: u32,
+        height: u32,
+    ) -> (wgpu::Texture, wgpu::TextureView, wgpu::BindGroup)
+    {
+        render::with_device(|device| {
+            let size = wgpu::Extent3d {
+                width,
+                height,
+                depth_or_array_layers: 1,
+            };
+
+            let texture = device.create_texture(&wgpu::TextureDescriptor {
+                label: Some("Snow Depth Texture"),
+                size,
+                mip_level_count: 1,
+                sample_count: 1,
+                dimension: wgpu::TextureDimension::D2,
+                format: wgpu::TextureFormat::R32Float,
+                usage: wgpu::TextureUsages::TEXTURE_BINDING
+                    | wgpu::TextureUsages::COPY_DST
+                    | wgpu::TextureUsages::STORAGE_BINDING,
+                view_formats: &[],
+            });
+
+            let data_bytes: &[u8] = bytemuck::cast_slice(depth_data);
+
+            render::with_queue(|queue| {
+                queue.write_texture(
+                    wgpu::TexelCopyTextureInfo {
+                        texture: &texture,
+                        mip_level: 0,
+                        origin: wgpu::Origin3d::ZERO,
+                        aspect: wgpu::TextureAspect::All,
+                    },
+                    data_bytes,
+                    wgpu::TexelCopyBufferLayout {
+                        offset: 0,
+                        bytes_per_row: Some(width * 4),
+                        rows_per_image: Some(height),
+                    },
+                    size,
+                );
+            });
+
+            let texture_view = texture.create_view(&wgpu::TextureViewDescriptor::default());
+
+            let bind_group_layout =
+                device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
+                    label: Some("Snow Depth Bind Group Layout"),
+                    entries: &[wgpu::BindGroupLayoutEntry {
+                        binding: 0,
+                        visibility: wgpu::ShaderStages::FRAGMENT | wgpu::ShaderStages::COMPUTE,
+                        ty: wgpu::BindingType::Texture {
+                            sample_type: wgpu::TextureSampleType::Float { filterable: false },
+                            view_dimension: wgpu::TextureViewDimension::D2,
+                            multisampled: false,
+                        },
+                        count: None,
+                    }],
+                });
+
+            let bind_group = device.create_bind_group(&wgpu::BindGroupDescriptor {
+                label: Some("Snow Depth Bind Group"),
+                layout: &bind_group_layout,
+                entries: &[wgpu::BindGroupEntry {
+                    binding: 0,
+                    resource: wgpu::BindingResource::TextureView(&texture_view),
+                }],
+            });
+
+            (texture, texture_view, bind_group)
+        })
+    }
+
+    fn generate_snow_mesh(
+        depth_data: &[f32],
+        heightmap_data: &[f32],
+        width: u32,
+        height: u32,
+        terrain_size: Vec2,
+    ) -> Mesh
+    {
+        let mut vertices = Vec::new();
+        let mut indices = Vec::new();
+
+        let cell_size_x = terrain_size.x / (width - 1) as f32;
+        let cell_size_z = terrain_size.y / (height - 1) as f32;
+        let half_width = terrain_size.x / 2.0;
+        let half_height = terrain_size.y / 2.0;
+
+        for z in 0..height
+        {
+            for x in 0..width
+            {
+                let index = (z * width + x) as usize;
+                let snow_depth = depth_data.get(index).copied().unwrap_or(0.0);
+                let terrain_height = heightmap_data.get(index).copied().unwrap_or(0.0);
+
+                let world_x = x as f32 * cell_size_x - half_width;
+                let world_z = z as f32 * cell_size_z - half_height;
+                let world_y = terrain_height + snow_depth;
+
+                vertices.push(Vertex {
+                    position: [world_x, world_y, world_z],
+                    normal: [0.0, 1.0, 0.0],
+                    uv: [x as f32 / width as f32, z as f32 / height as f32],
+                });
+            }
+        }
+
+        for z in 0..(height - 1)
+        {
+            for x in 0..(width - 1)
+            {
+                let index = (z * width + x) as usize;
+                let depth_tl = depth_data.get(index).copied().unwrap_or(0.0);
+                let depth_tr = depth_data.get(index + 1).copied().unwrap_or(0.0);
+                let depth_bl = depth_data.get(index + width as usize).copied().unwrap_or(0.0);
+                let depth_br = depth_data
+                    .get(index + width as usize + 1)
+                    .copied()
+                    .unwrap_or(0.0);
+
+                if depth_tl > 0.001
+                    || depth_tr > 0.001
+                    || depth_bl > 0.001
+                    || depth_br > 0.001
+                {
+                    let vertex_index = (z * width + x) as u32;
+
+                    indices.push(vertex_index);
+                    indices.push(vertex_index + width);
+                    indices.push(vertex_index + 1);
+
+                    indices.push(vertex_index + 1);
+                    indices.push(vertex_index + width);
+                    indices.push(vertex_index + width + 1);
+                }
+            }
+        }
+
+        let vertex_buffer = render::with_device(|device| {
+            device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
+                label: Some("Snow Vertex Buffer"),
+                contents: bytemuck::cast_slice(&vertices),
+                usage: wgpu::BufferUsages::VERTEX,
+            })
+        });
+
+        let index_buffer = render::with_device(|device| {
+            device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
+                label: Some("Snow Index Buffer"),
+                contents: bytemuck::cast_slice(&indices),
+                usage: wgpu::BufferUsages::INDEX,
+            })
+        });
+
+        Mesh {
+            vertex_buffer,
+            index_buffer,
+            num_indices: indices.len() as u32,
+        }
+    }
+
+    fn create_deform_pipeline(
+        depth_texture_view: &wgpu::TextureView,
+    ) -> (wgpu::ComputePipeline, wgpu::BindGroup, wgpu::Buffer)
+    {
+        render::with_device(|device| {
+            let shader_source = std::fs::read_to_string("src/shaders/snow_deform.wgsl")
+                .expect("Failed to load snow deform shader");
+
+            let shader = device.create_shader_module(wgpu::ShaderModuleDescriptor {
+                label: Some("Snow Deform Shader"),
+                source: wgpu::ShaderSource::Wgsl(shader_source.into()),
+            });
+
+            let params_buffer = device.create_buffer(&wgpu::BufferDescriptor {
+                label: Some("Snow Deform Params"),
+                size: 32,
+                usage: wgpu::BufferUsages::UNIFORM | wgpu::BufferUsages::COPY_DST,
+                mapped_at_creation: false,
+            });
+
+            let bind_group_layout =
+                device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
+                    label: Some("Snow Deform Bind Group Layout"),
+                    entries: &[
+                        wgpu::BindGroupLayoutEntry {
+                            binding: 0,
+                            visibility: wgpu::ShaderStages::COMPUTE,
+                            ty: wgpu::BindingType::StorageTexture {
+                                access: wgpu::StorageTextureAccess::ReadWrite,
+                                format: wgpu::TextureFormat::R32Float,
+                                view_dimension: wgpu::TextureViewDimension::D2,
+                            },
+                            count: None,
+                        },
+                        wgpu::BindGroupLayoutEntry {
+                            binding: 1,
+                            visibility: wgpu::ShaderStages::COMPUTE,
+                            ty: wgpu::BindingType::Buffer {
+                                ty: wgpu::BufferBindingType::Uniform,
+                                has_dynamic_offset: false,
+                                min_binding_size: None,
+                            },
+                            count: None,
+                        },
+                    ],
+                });
+
+            let bind_group = device.create_bind_group(&wgpu::BindGroupDescriptor {
+                label: Some("Snow Deform Bind Group"),
+                layout: &bind_group_layout,
+                entries: &[
+                    wgpu::BindGroupEntry {
+                        binding: 0,
+                        resource: wgpu::BindingResource::TextureView(depth_texture_view),
+                    },
+                    wgpu::BindGroupEntry {
+                        binding: 1,
+                        resource: params_buffer.as_entire_binding(),
+                    },
+                ],
+            });
+
+            let pipeline_layout = device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
+                label: Some("Snow Deform Pipeline Layout"),
+                bind_group_layouts: &[&bind_group_layout],
+                push_constant_ranges: &[],
+            });
+
+            let pipeline = device.create_compute_pipeline(&wgpu::ComputePipelineDescriptor {
+                label: Some("Snow Deform Pipeline"),
+                layout: Some(&pipeline_layout),
+                module: &shader,
+                entry_point: Some("deform"),
+                compilation_options: Default::default(),
+                cache: None,
+            });
+
+            (pipeline, bind_group, params_buffer)
+        })
+    }
+
+    pub fn deform_at_position(&self, position: Vec3, radius: f32, depth: f32)
+    {
+        render::with_queue(|queue| {
+            let params_data = [position.x, position.z, radius, depth];
+            let params_bytes: &[u8] = bytemuck::cast_slice(&params_data);
+
+            queue.write_buffer(&self.deform_params_buffer, 0, params_bytes);
+        });
+
+        render::with_device(|device| {
+            let mut encoder = device.create_command_encoder(&wgpu::CommandEncoderDescriptor {
+                label: Some("Snow Deform Encoder"),
+            });
+
+            {
+                let mut compute_pass = encoder.begin_compute_pass(&wgpu::ComputePassDescriptor {
+                    label: Some("Snow Deform Pass"),
+                    timestamp_writes: None,
+                });
+
+                compute_pass.set_pipeline(&self.deform_pipeline);
+                compute_pass.set_bind_group(0, &self.deform_bind_group, &[]);
+
+                let workgroup_size = 16;
+                let dispatch_x = (self.width + workgroup_size - 1) / workgroup_size;
+                let dispatch_y = (self.height + workgroup_size - 1) / workgroup_size;
+                compute_pass.dispatch_workgroups(dispatch_x, dispatch_y, 1);
+            }
+
+            render::with_queue(|queue| {
+                queue.submit(Some(encoder.finish()));
+            });
+        });
+    }
+
+    #[allow(dead_code)]
+    pub fn regenerate_mesh(&mut self, _world: &mut World, _config: &SnowConfig)
+    {
+        todo!("Implement regenerate_mesh with correct wgpu types for texture-to-buffer copy");
+    }
+}

src/snow_light.rs

@@ -0,0 +1,550 @@
+use bytemuck::{Pod, Zeroable};
+use glam::{Vec2, Vec3};
+use wgpu::util::DeviceExt;
+
+#[repr(C)]
+#[derive(Clone, Copy, Pod, Zeroable)]
+struct AccumulationUniforms
+{
+    terrain_min_xz: [f32; 2],
+    terrain_max_xz: [f32; 2],
+    decay_rate: f32,
+    delta_time: f32,
+    spotlight_count: u32,
+    _padding: u32,
+    light_view_projection: [[f32; 4]; 4],
+    shadow_bias: f32,
+    terrain_height_scale: f32,
+    _padding3: f32,
+    _padding4: f32,
+    spotlights: [crate::render::SpotlightRaw; crate::render::MAX_SPOTLIGHTS],
+}
+
+pub struct SnowLightAccumulation
+{
+    texture_ping: wgpu::Texture,
+    texture_pong: wgpu::Texture,
+    view_ping: wgpu::TextureView,
+    view_pong: wgpu::TextureView,
+
+    bind_group_layout: wgpu::BindGroupLayout,
+    bind_group_ping: Option<wgpu::BindGroup>,
+    bind_group_pong: Option<wgpu::BindGroup>,
+
+    uniform_buffer: wgpu::Buffer,
+    pipeline: wgpu::RenderPipeline,
+
+    quad_vb: wgpu::Buffer,
+    quad_ib: wgpu::Buffer,
+    quad_num_indices: u32,
+
+    current: bool,
+    needs_clear: bool,
+
+    terrain_min: Vec2,
+    terrain_max: Vec2,
+    pub decay_rate: f32,
+}
+
+impl SnowLightAccumulation
+{
+    pub fn new(
+        device: &wgpu::Device,
+        terrain_min: Vec2,
+        terrain_max: Vec2,
+        resolution: u32,
+    ) -> Self
+    {
+        let size = wgpu::Extent3d {
+            width: resolution,
+            height: resolution,
+            depth_or_array_layers: 1,
+        };
+
+        let texture_desc = wgpu::TextureDescriptor {
+            label: Some("Snow Light Accumulation"),
+            size,
+            mip_level_count: 1,
+            sample_count: 1,
+            dimension: wgpu::TextureDimension::D2,
+            format: wgpu::TextureFormat::R16Float,
+            usage: wgpu::TextureUsages::RENDER_ATTACHMENT
+                 | wgpu::TextureUsages::TEXTURE_BINDING,
+            view_formats: &[],
+        };
+
+        let texture_ping = device.create_texture(&texture_desc);
+        let texture_pong = device.create_texture(&texture_desc);
+
+        let view_ping = texture_ping.create_view(&wgpu::TextureViewDescriptor::default());
+        let view_pong = texture_pong.create_view(&wgpu::TextureViewDescriptor::default());
+
+        let sampler = device.create_sampler(&wgpu::SamplerDescriptor {
+            label: Some("Snow Light Sampler"),
+            address_mode_u: wgpu::AddressMode::ClampToEdge,
+            address_mode_v: wgpu::AddressMode::ClampToEdge,
+            mag_filter: wgpu::FilterMode::Linear,
+            min_filter: wgpu::FilterMode::Linear,
+            ..Default::default()
+        });
+
+        let uniform_buffer = device.create_buffer(&wgpu::BufferDescriptor {
+            label: Some("Snow Light Accumulation Uniforms"),
+            size: std::mem::size_of::<AccumulationUniforms>() as wgpu::BufferAddress,
+            usage: wgpu::BufferUsages::UNIFORM | wgpu::BufferUsages::COPY_DST,
+            mapped_at_creation: false,
+        });
+
+        let bind_group_layout = device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
+            label: Some("Snow Light Accumulation Bind Group Layout"),
+            entries: &[
+                wgpu::BindGroupLayoutEntry {
+                    binding: 0,
+                    visibility: wgpu::ShaderStages::FRAGMENT,
+                    ty: wgpu::BindingType::Texture {
+                        sample_type: wgpu::TextureSampleType::Float { filterable: true },
+                        view_dimension: wgpu::TextureViewDimension::D2,
+                        multisampled: false,
+                    },
+                    count: None,
+                },
+                wgpu::BindGroupLayoutEntry {
+                    binding: 1,
+                    visibility: wgpu::ShaderStages::FRAGMENT,
+                    ty: wgpu::BindingType::Sampler(wgpu::SamplerBindingType::Filtering),
+                    count: None,
+                },
+                wgpu::BindGroupLayoutEntry {
+                    binding: 2,
+                    visibility: wgpu::ShaderStages::FRAGMENT,
+                    ty: wgpu::BindingType::Buffer {
+                        ty: wgpu::BufferBindingType::Uniform,
+                        has_dynamic_offset: false,
+                        min_binding_size: None,
+                    },
+                    count: None,
+                },
+                wgpu::BindGroupLayoutEntry {
+                    binding: 3,
+                    visibility: wgpu::ShaderStages::FRAGMENT,
+                    ty: wgpu::BindingType::Texture {
+                        sample_type: wgpu::TextureSampleType::Float { filterable: false },
+                        view_dimension: wgpu::TextureViewDimension::D2,
+                        multisampled: false,
+                    },
+                    count: None,
+                },
+                wgpu::BindGroupLayoutEntry {
+                    binding: 4,
+                    visibility: wgpu::ShaderStages::FRAGMENT,
+                    ty: wgpu::BindingType::Sampler(wgpu::SamplerBindingType::NonFiltering),
+                    count: None,
+                },
+                wgpu::BindGroupLayoutEntry {
+                    binding: 5,
+                    visibility: wgpu::ShaderStages::FRAGMENT,
+                    ty: wgpu::BindingType::Texture {
+                        sample_type: wgpu::TextureSampleType::Depth,
+                        view_dimension: wgpu::TextureViewDimension::D2,
+                        multisampled: false,
+                    },
+                    count: None,
+                },
+                wgpu::BindGroupLayoutEntry {
+                    binding: 6,
+                    visibility: wgpu::ShaderStages::FRAGMENT,
+                    ty: wgpu::BindingType::Sampler(wgpu::SamplerBindingType::Comparison),
+                    count: None,
+                },
+                wgpu::BindGroupLayoutEntry {
+                    binding: 7,
+                    visibility: wgpu::ShaderStages::FRAGMENT,
+                    ty: wgpu::BindingType::Texture {
+                        sample_type: wgpu::TextureSampleType::Float { filterable: false },
+                        view_dimension: wgpu::TextureViewDimension::D2,
+                        multisampled: false,
+                    },
+                    count: None,
+                },
+                wgpu::BindGroupLayoutEntry {
+                    binding: 8,
+                    visibility: wgpu::ShaderStages::FRAGMENT,
+                    ty: wgpu::BindingType::Sampler(wgpu::SamplerBindingType::NonFiltering),
+                    count: None,
+                },
+            ],
+        });
+
+        let compiler = wesl::Wesl::new("src/shaders");
+        let shader_source = compiler
+            .compile(&"package::snow_light_accumulation".parse().unwrap())
+            .inspect_err(|e| eprintln!("WESL error: {e}"))
+            .unwrap()
+            .to_string();
+
+        let shader = device.create_shader_module(wgpu::ShaderModuleDescriptor {
+            label: Some("Snow Light Accumulation Shader"),
+            source: wgpu::ShaderSource::Wgsl(shader_source.into()),
+        });
+
+        let pipeline_layout = device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
+            label: Some("Snow Light Accumulation Pipeline Layout"),
+            bind_group_layouts: &[&bind_group_layout],
+            push_constant_ranges: &[],
+        });
+
+        let pipeline = device.create_render_pipeline(&wgpu::RenderPipelineDescriptor {
+            label: Some("Snow Light Accumulation Pipeline"),
+            layout: Some(&pipeline_layout),
+            vertex: wgpu::VertexState {
+                module: &shader,
+                entry_point: Some("vs_main"),
+                buffers: &[],
+                compilation_options: Default::default(),
+            },
+            fragment: Some(wgpu::FragmentState {
+                module: &shader,
+                entry_point: Some("fs_main"),
+                targets: &[Some(wgpu::ColorTargetState {
+                    format: wgpu::TextureFormat::R16Float,
+                    blend: Some(wgpu::BlendState::REPLACE),
+                    write_mask: wgpu::ColorWrites::ALL,
+                })],
+                compilation_options: Default::default(),
+            }),
+            primitive: wgpu::PrimitiveState {
+                topology: wgpu::PrimitiveTopology::TriangleList,
+                strip_index_format: None,
+                front_face: wgpu::FrontFace::Ccw,
+                cull_mode: None,
+                polygon_mode: wgpu::PolygonMode::Fill,
+                unclipped_depth: false,
+                conservative: false,
+            },
+            depth_stencil: None,
+            multisample: wgpu::MultisampleState {
+                count: 1,
+                mask: !0,
+                alpha_to_coverage_enabled: false,
+            },
+            multiview: None,
+            cache: None,
+        });
+
+        let vertices: &[f32] = &[
+            -1.0, -1.0, 0.0, 1.0,
+             3.0, -1.0, 2.0, 1.0,
+            -1.0,  3.0, 0.0, -1.0,
+        ];
+
+        let quad_vb = device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
+            label: Some("Snow Light Quad VB"),
+            contents: bytemuck::cast_slice(vertices),
+            usage: wgpu::BufferUsages::VERTEX,
+        });
+
+        let indices: &[u16] = &[0, 1, 2];
+        let quad_ib = device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
+            label: Some("Snow Light Quad IB"),
+            contents: bytemuck::cast_slice(indices),
+            usage: wgpu::BufferUsages::INDEX,
+        });
+
+        Self {
+            texture_ping,
+            texture_pong,
+            view_ping,
+            view_pong,
+            bind_group_layout,
+            bind_group_ping: None,
+            bind_group_pong: None,
+            uniform_buffer,
+            pipeline,
+            quad_vb,
+            quad_ib,
+            quad_num_indices: 3,
+            current: false,
+            needs_clear: true,
+            terrain_min,
+            terrain_max,
+            decay_rate: 0.015,
+        }
+    }
+
+    pub fn clear(&self, encoder: &mut wgpu::CommandEncoder)
+    {
+        encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
+            label: Some("Clear Snow Light Ping"),
+            color_attachments: &[Some(wgpu::RenderPassColorAttachment {
+                view: &self.view_ping,
+                resolve_target: None,
+                ops: wgpu::Operations {
+                    load: wgpu::LoadOp::Clear(wgpu::Color::BLACK),
+                    store: wgpu::StoreOp::Store,
+                },
+                depth_slice: None,
+            })],
+            depth_stencil_attachment: None,
+            timestamp_writes: None,
+            occlusion_query_set: None,
+        });
+
+        encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
+            label: Some("Clear Snow Light Pong"),
+            color_attachments: &[Some(wgpu::RenderPassColorAttachment {
+                view: &self.view_pong,
+                resolve_target: None,
+                ops: wgpu::Operations {
+                    load: wgpu::LoadOp::Clear(wgpu::Color::BLACK),
+                    store: wgpu::StoreOp::Store,
+                },
+                depth_slice: None,
+            })],
+            depth_stencil_attachment: None,
+            timestamp_writes: None,
+            occlusion_query_set: None,
+        });
+    }
+
+    pub fn set_heightmap(
+        &mut self,
+        device: &wgpu::Device,
+        heightmap_view: &wgpu::TextureView,
+        heightmap_sampler: &wgpu::Sampler,
+        shadow_map_view: &wgpu::TextureView,
+        shadow_sampler: &wgpu::Sampler,
+        snow_depth_view: &wgpu::TextureView,
+        snow_depth_sampler: &wgpu::Sampler,
+    )
+    {
+        let sampler = device.create_sampler(&wgpu::SamplerDescriptor {
+            label: Some("Snow Light Sampler"),
+            address_mode_u: wgpu::AddressMode::ClampToEdge,
+            address_mode_v: wgpu::AddressMode::ClampToEdge,
+            mag_filter: wgpu::FilterMode::Linear,
+            min_filter: wgpu::FilterMode::Linear,
+            ..Default::default()
+        });
+
+        self.bind_group_ping = Some(device.create_bind_group(&wgpu::BindGroupDescriptor {
+            label: Some("Snow Light Accumulation Bind Group Ping"),
+            layout: &self.bind_group_layout,
+            entries: &[
+                wgpu::BindGroupEntry {
+                    binding: 0,
+                    resource: wgpu::BindingResource::TextureView(&self.view_pong),
+                },
+                wgpu::BindGroupEntry {
+                    binding: 1,
+                    resource: wgpu::BindingResource::Sampler(&sampler),
+                },
+                wgpu::BindGroupEntry {
+                    binding: 2,
+                    resource: self.uniform_buffer.as_entire_binding(),
+                },
+                wgpu::BindGroupEntry {
+                    binding: 3,
+                    resource: wgpu::BindingResource::TextureView(heightmap_view),
+                },
+                wgpu::BindGroupEntry {
+                    binding: 4,
+                    resource: wgpu::BindingResource::Sampler(heightmap_sampler),
+                },
+                wgpu::BindGroupEntry {
+                    binding: 5,
+                    resource: wgpu::BindingResource::TextureView(shadow_map_view),
+                },
+                wgpu::BindGroupEntry {
+                    binding: 6,
+                    resource: wgpu::BindingResource::Sampler(shadow_sampler),
+                },
+                wgpu::BindGroupEntry {
+                    binding: 7,
+                    resource: wgpu::BindingResource::TextureView(snow_depth_view),
+                },
+                wgpu::BindGroupEntry {
+                    binding: 8,
+                    resource: wgpu::BindingResource::Sampler(snow_depth_sampler),
+                },
+            ],
+        }));
+
+        self.bind_group_pong = Some(device.create_bind_group(&wgpu::BindGroupDescriptor {
+            label: Some("Snow Light Accumulation Bind Group Pong"),
+            layout: &self.bind_group_layout,
+            entries: &[
+                wgpu::BindGroupEntry {
+                    binding: 0,
+                    resource: wgpu::BindingResource::TextureView(&self.view_ping),
+                },
+                wgpu::BindGroupEntry {
+                    binding: 1,
+                    resource: wgpu::BindingResource::Sampler(&sampler),
+                },
+                wgpu::BindGroupEntry {
+                    binding: 2,
+                    resource: self.uniform_buffer.as_entire_binding(),
+                },
+                wgpu::BindGroupEntry {
+                    binding: 3,
+                    resource: wgpu::BindingResource::TextureView(heightmap_view),
+                },
+                wgpu::BindGroupEntry {
+                    binding: 4,
+                    resource: wgpu::BindingResource::Sampler(heightmap_sampler),
+                },
+                wgpu::BindGroupEntry {
+                    binding: 5,
+                    resource: wgpu::BindingResource::TextureView(shadow_map_view),
+                },
+                wgpu::BindGroupEntry {
+                    binding: 6,
+                    resource: wgpu::BindingResource::Sampler(shadow_sampler),
+                },
+                wgpu::BindGroupEntry {
+                    binding: 7,
+                    resource: wgpu::BindingResource::TextureView(snow_depth_view),
+                },
+                wgpu::BindGroupEntry {
+                    binding: 8,
+                    resource: wgpu::BindingResource::Sampler(snow_depth_sampler),
+                },
+            ],
+        }));
+    }
+
+    pub fn render(
+        &mut self,
+        encoder: &mut wgpu::CommandEncoder,
+        queue: &wgpu::Queue,
+        spotlights: &[crate::render::Spotlight],
+        delta_time: f32,
+        light_view_projection: &glam::Mat4,
+        shadow_bias: f32,
+        terrain_height_scale: f32,
+    )
+    {
+        if self.needs_clear
+        {
+            self.clear(encoder);
+            self.needs_clear = false;
+        }
+
+        let mut spotlight_array = [crate::render::SpotlightRaw::default(); crate::render::MAX_SPOTLIGHTS];
+        for (i, spotlight) in spotlights.iter().take(crate::render::MAX_SPOTLIGHTS).enumerate()
+        {
+            spotlight_array[i] = spotlight.to_raw();
+        }
+
+        let uniforms = AccumulationUniforms {
+            terrain_min_xz: self.terrain_min.to_array(),
+            terrain_max_xz: self.terrain_max.to_array(),
+            decay_rate: self.decay_rate,
+            delta_time,
+            spotlight_count: spotlights.len().min(crate::render::MAX_SPOTLIGHTS) as u32,
+            _padding: 0,
+            light_view_projection: light_view_projection.to_cols_array_2d(),
+            shadow_bias,
+            terrain_height_scale,
+            _padding3: 0.0,
+            _padding4: 0.0,
+            spotlights: spotlight_array,
+        };
+
+        queue.write_buffer(&self.uniform_buffer, 0, bytemuck::cast_slice(&[uniforms]));
+
+        let write_view = if self.current { &self.view_ping } else { &self.view_pong };
+        let bind_group = if self.current { self.bind_group_ping.as_ref() } else { self.bind_group_pong.as_ref() };
+
+        let Some(bind_group) = bind_group else {
+            return;
+        };
+
+        {
+            let mut render_pass = encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
+                label: Some("Snow Light Accumulation Pass"),
+                color_attachments: &[Some(wgpu::RenderPassColorAttachment {
+                    view: write_view,
+                    resolve_target: None,
+                    ops: wgpu::Operations {
+                        load: wgpu::LoadOp::Load,
+                        store: wgpu::StoreOp::Store,
+                    },
+                    depth_slice: None,
+                })],
+                depth_stencil_attachment: None,
+                timestamp_writes: None,
+                occlusion_query_set: None,
+            });
+
+            render_pass.set_pipeline(&self.pipeline);
+            render_pass.set_bind_group(0, bind_group, &[]);
+            render_pass.set_vertex_buffer(0, self.quad_vb.slice(..));
+            render_pass.set_index_buffer(self.quad_ib.slice(..), wgpu::IndexFormat::Uint16);
+            render_pass.draw_indexed(0..self.quad_num_indices, 0, 0..1);
+        }
+
+        self.current = !self.current;
+    }
+
+    pub fn read_view(&self) -> &wgpu::TextureView
+    {
+        if self.current { &self.view_pong } else { &self.view_ping }
+    }
+
+    pub fn create_bind_group_layout(device: &wgpu::Device) -> wgpu::BindGroupLayout
+    {
+        device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
+            label: Some("Snow Persistent Light Bind Group Layout"),
+            entries: &[
+                wgpu::BindGroupLayoutEntry {
+                    binding: 0,
+                    visibility: wgpu::ShaderStages::FRAGMENT,
+                    ty: wgpu::BindingType::Texture {
+                        sample_type: wgpu::TextureSampleType::Float { filterable: true },
+                        view_dimension: wgpu::TextureViewDimension::D2,
+                        multisampled: false,
+                    },
+                    count: None,
+                },
+                wgpu::BindGroupLayoutEntry {
+                    binding: 1,
+                    visibility: wgpu::ShaderStages::FRAGMENT,
+                    ty: wgpu::BindingType::Sampler(wgpu::SamplerBindingType::Filtering),
+                    count: None,
+                },
+            ],
+        })
+    }
+
+    pub fn create_read_bind_group(
+        &self,
+        device: &wgpu::Device,
+        layout: &wgpu::BindGroupLayout,
+    ) -> wgpu::BindGroup
+    {
+        let sampler = device.create_sampler(&wgpu::SamplerDescriptor {
+            label: Some("Snow Persistent Light Sampler"),
+            address_mode_u: wgpu::AddressMode::ClampToEdge,
+            address_mode_v: wgpu::AddressMode::ClampToEdge,
+            mag_filter: wgpu::FilterMode::Linear,
+            min_filter: wgpu::FilterMode::Linear,
+            ..Default::default()
+        });
+
+        device.create_bind_group(&wgpu::BindGroupDescriptor {
+            label: Some("Snow Persistent Light Bind Group"),
+            layout,
+            entries: &[
+                wgpu::BindGroupEntry {
+                    binding: 0,
+                    resource: wgpu::BindingResource::TextureView(self.read_view()),
+                },
+                wgpu::BindGroupEntry {
+                    binding: 1,
+                    resource: wgpu::BindingResource::Sampler(&sampler),
+                },
+            ],
+        })
+    }
+}

src/space.rs

@@ -0,0 +1,75 @@
+use anyhow::Result;
+use glam::Vec3;
+
+use crate::{
+    empty::Empties,
+    light::{LightData, Lights},
+    mesh::{InstanceData, Mesh},
+    render,
+};
+
+pub const CAMERA_SPAWN_OFFSET: Vec3 = Vec3::new(15.0, 15.0, 15.0);
+
+pub struct Space
+{
+    pub mesh_data: Vec<(Mesh, Vec<InstanceData>)>,
+    pub spotlights: Vec<LightData>,
+    pub player_spawn: Vec3,
+}
+
+impl Space
+{
+    pub fn load_space(gltf_path: &str) -> Result<Space>
+    {
+        let mesh_data = render::with_device(|device| {
+            Mesh::load_gltf_with_instances(device, gltf_path)
+        })?;
+
+        let lights = Lights::load_lights(gltf_path)
+            .map_err(|e| anyhow::anyhow!("Failed to load lights: {}", e))?;
+
+        let spotlights = lights.into_spotlights();
+
+        let player_spawn = Self::get_player_spawn(gltf_path)?;
+
+        Ok(Space {
+            mesh_data,
+            spotlights,
+            player_spawn,
+        })
+    }
+
+    fn get_player_spawn(gltf_path: &str) -> Result<Vec3>
+    {
+        let empty = Empties::get_empty_by_name(gltf_path, "PlayerSpawn")?;
+
+        if let Some(empty_node) = empty
+        {
+            let (_scale, _rotation, translation) = empty_node.transform.to_scale_rotation_translation();
+            Ok(translation)
+        }
+        else
+        {
+            println!("Warning: PlayerSpawn empty not found, using default position");
+            Ok(Vec3::new(0.0, 5.0, 0.0))
+        }
+    }
+
+    pub fn camera_spawn_position(&self) -> Vec3
+    {
+        self.player_spawn + CAMERA_SPAWN_OFFSET
+    }
+
+    pub fn terrain_mesh(&self) -> Option<&Mesh>
+    {
+        self.mesh_data.first().map(|(mesh, _)| mesh)
+    }
+
+    pub fn tree_instances(&self) -> Option<(&Mesh, &Vec<InstanceData>)>
+    {
+        self.mesh_data
+            .iter()
+            .find(|(_, instances)| !instances.is_empty())
+            .map(|(mesh, instances)| (mesh, instances))
+    }
+}

src/systems/camera.rs

@@ -1,7 +1,8 @@
 use glam::Vec3;
 
+use crate::components::FollowComponent;
 use crate::utility::input::InputState;
-use crate::world::World;
+use crate::world::{Transform, World};
 
 pub fn camera_input_system(world: &mut World, input_state: &InputState)
 {
@@ -18,11 +19,7 @@ pub fn camera_input_system(world: &mut World, input_state: &InputState)
 
             if input_state.mouse_delta.0.abs() > 0.0 || input_state.mouse_delta.1.abs() > 0.0
             {
-                let is_following = world
-                    .camera_follows
-                    .get(camera_entity)
-                    .map(|f| f.is_following)
-                    .unwrap_or(false);
+                let is_following = world.follows.get(camera_entity).is_some();
 
                 camera.yaw += input_state.mouse_delta.0 * 0.0008;
 
@@ -45,26 +42,20 @@ pub fn camera_input_system(world: &mut World, input_state: &InputState)
 
 pub fn camera_follow_system(world: &mut World)
 {
-    let camera_entities: Vec<_> = world.camera_follows.all();
+    let camera_entities: Vec<_> = world.follows.all();
 
     for camera_entity in camera_entities
     {
-        if let Some(follow) = world.camera_follows.get(camera_entity)
+        if let Some(camera) = world.cameras.get(camera_entity)
         {
-            if !follow.is_following
+            if let Some(follow) = world.follows.get(camera_entity)
             {
-                continue;
-            }
+                let target_entity = follow.target;
+                let offset = follow.offset.position;
 
-            let target_entity = follow.target_entity;
-            let offset = follow.offset;
-
-            if let Some(target_transform) = world.transforms.get(target_entity)
-            {
-                let target_position = target_transform.position;
-
-                if let Some(camera) = world.cameras.get_mut(camera_entity)
+                if let Some(target_transform) = world.transforms.get(target_entity)
                 {
+                    let target_position = target_transform.position;
                     let distance = offset.length();
 
                     let orbit_yaw = camera.yaw + std::f32::consts::PI;
@@ -75,15 +66,15 @@ pub fn camera_follow_system(world: &mut World)
 
                     let new_offset = Vec3::new(offset_x, offset_y, offset_z);
 
-                    if let Some(camera_transform) = world.transforms.get_mut(camera_entity)
-                    {
-                        camera_transform.position = target_position + new_offset;
-                    }
+                    world
+                        .transforms
+                        .with_mut(camera_entity, |camera_transform| {
+                            camera_transform.position = target_position + new_offset;
+                        });
 
-                    if let Some(follow_mut) = world.camera_follows.get_mut(camera_entity)
-                    {
-                        follow_mut.offset = new_offset;
-                    }
+                    world.follows.components.get_mut(&camera_entity).map(|f| {
+                        f.offset.position = new_offset;
+                    });
                 }
             }
         }
@@ -152,19 +143,16 @@ pub fn camera_noclip_system(world: &mut World, input_state: &InputState, delta:
 
 pub fn start_camera_following(world: &mut World, camera_entity: crate::entity::EntityHandle)
 {
-    if let Some(follow) = world.camera_follows.get_mut(camera_entity)
+    if let Some(camera_transform) = world.transforms.get(camera_entity)
     {
-        let target_entity = follow.target_entity;
-
-        if let Some(target_transform) = world.transforms.get(target_entity)
+        let player_entities = world.player_tags.all();
+        if let Some(&player_entity) = player_entities.first()
         {
-            if let Some(camera_transform) = world.transforms.get(camera_entity)
+            if let Some(target_transform) = world.transforms.get(player_entity)
             {
                 let offset = camera_transform.position - target_transform.position;
-                follow.offset = offset;
-                follow.is_following = true;
-
                 let distance = offset.length();
+
                 if distance > 0.0
                 {
                     if let Some(camera) = world.cameras.get_mut(camera_entity)
@@ -173,6 +161,16 @@ pub fn start_camera_following(world: &mut World, camera_entity: crate::entity::E
                         camera.yaw = offset.z.atan2(offset.x) + std::f32::consts::PI;
                     }
                 }
+
+                world.follows.insert(
+                    camera_entity,
+                    FollowComponent {
+                        target: player_entity,
+                        offset: Transform::from_position(offset),
+                        inherit_rotation: false,
+                        inherit_scale: false,
+                    },
+                );
             }
         }
     }
@@ -180,13 +178,13 @@ pub fn start_camera_following(world: &mut World, camera_entity: crate::entity::E
 
 pub fn stop_camera_following(world: &mut World, camera_entity: crate::entity::EntityHandle)
 {
-    if let Some(follow) = world.camera_follows.get_mut(camera_entity)
+    if let Some(follow) = world.follows.get(camera_entity)
     {
-        follow.is_following = false;
+        let target_entity = follow.target;
 
         if let Some(camera_transform) = world.transforms.get(camera_entity)
         {
-            if let Some(target_transform) = world.transforms.get(follow.target_entity)
+            if let Some(target_transform) = world.transforms.get(target_entity)
             {
                 let look_direction =
                     (target_transform.position - camera_transform.position).normalize();
@@ -198,5 +196,7 @@ pub fn stop_camera_following(world: &mut World, camera_entity: crate::entity::En
                 }
             }
         }
+
+        world.follows.remove(camera_entity);
     }
 }

src/systems/follow.rs

@@ -0,0 +1,48 @@
+use crate::world::World;
+
+pub fn follow_system(world: &mut World)
+{
+    let following_entities: Vec<_> = world.follows.all();
+
+    for entity in following_entities
+    {
+        if let Some(follow) = world.follows.get(entity)
+        {
+            let target = follow.target;
+            if let Some(target_transform) = world.transforms.get(target)
+            {
+                let target_pos = target_transform.position;
+                let target_rot = target_transform.rotation;
+                let target_scale = target_transform.scale;
+                let offset = follow.offset;
+                let inherit_rot = follow.inherit_rotation;
+                let inherit_scale = follow.inherit_scale;
+
+                world.transforms.with_mut(entity, |transform| {
+                    transform.position = target_pos;
+
+                    if inherit_rot
+                    {
+                        let rotated_offset = target_rot * offset.position;
+                        transform.position += rotated_offset;
+                        transform.rotation = target_rot * offset.rotation;
+                    }
+                    else
+                    {
+                        transform.position += offset.position;
+                        transform.rotation = offset.rotation;
+                    }
+
+                    if inherit_scale
+                    {
+                        transform.scale = target_scale * offset.scale;
+                    }
+                    else
+                    {
+                        transform.scale = offset.scale;
+                    }
+                });
+            }
+        }
+    }
+}

src/systems/mod.rs

@@ -1,14 +1,22 @@
 pub mod camera;
+pub mod follow;
 pub mod input;
 pub mod physics_sync;
 pub mod render;
+pub mod rotate;
+pub mod spotlight_sync;
 pub mod state_machine;
+pub mod tree_dissolve;
 
 pub use camera::{
     camera_follow_system, camera_input_system, camera_noclip_system, start_camera_following,
     stop_camera_following,
 };
+pub use follow::follow_system;
 pub use input::player_input_system;
 pub use physics_sync::physics_sync_system;
 pub use render::render_system;
+pub use rotate::rotate_system;
+pub use spotlight_sync::spotlight_sync_system;
 pub use state_machine::{state_machine_physics_system, state_machine_system};
+pub use tree_dissolve::{tree_dissolve_update_system, tree_occlusion_system};

src/systems/render.rs

@@ -2,8 +2,6 @@ use crate::mesh::InstanceRaw;
 use crate::render::DrawCall;
 use crate::world::World;
 use bytemuck::cast_slice;
-use glam::Mat4;
-use wgpu::util::DeviceExt;
 
 pub fn render_system(world: &World) -> Vec<DrawCall>
 {
@@ -24,16 +22,27 @@ pub fn render_system(world: &World) -> Vec<DrawCall>
             }
             else
             {
+                let dissolve_amount = world.dissolves.get(entity).map(|d| d.amount).unwrap_or(0.0);
+
                 let instance_data = InstanceRaw {
                     model: model_matrix.to_cols_array_2d(),
+                    dissolve_amount,
+                    _padding: [0.0; 3],
                 };
 
                 let buffer = crate::render::with_device(|device| {
-                    device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
+                    let buffer = device.create_buffer(&wgpu::BufferDescriptor {
                         label: Some("Instance Buffer"),
-                        contents: cast_slice(&[instance_data]),
-                        usage: wgpu::BufferUsages::VERTEX,
-                    })
+                        size: std::mem::size_of::<InstanceRaw>() as u64,
+                        usage: wgpu::BufferUsages::VERTEX | wgpu::BufferUsages::COPY_DST,
+                        mapped_at_creation: false,
+                    });
+
+                    crate::render::with_queue(|queue| {
+                        queue.write_buffer(&buffer, 0, cast_slice(&[instance_data]));
+                    });
+
+                    buffer
                 });
 
                 (Some(buffer), 1)

src/systems/rotate.rs

@@ -0,0 +1,20 @@
+use glam::Quat;
+
+use crate::world::World;
+
+pub fn rotate_system(world: &mut World, delta: f32)
+{
+    let entities = world.rotates.all();
+
+    for entity in entities
+    {
+        if let Some(rotate) = world.rotates.get(entity)
+        {
+            let rotation_delta = Quat::from_axis_angle(rotate.axis, rotate.speed * delta);
+
+            world.transforms.with_mut(entity, |transform| {
+                transform.rotation = rotation_delta * transform.rotation;
+            });
+        }
+    }
+}

src/systems/spotlight_sync.rs

@@ -0,0 +1,32 @@
+use crate::render::Spotlight;
+use crate::world::World;
+
+pub fn spotlight_sync_system(world: &World) -> Vec<Spotlight>
+{
+    let mut entities = world.spotlights.all();
+    entities.sort();
+
+    let mut spotlights = Vec::new();
+
+    for entity in entities
+    {
+        if let Some(spotlight_component) = world.spotlights.get(entity)
+        {
+            if let Some(transform) = world.transforms.get(entity)
+            {
+                let position = transform.position + spotlight_component.offset;
+                let direction = transform.rotation * spotlight_component.direction;
+
+                spotlights.push(Spotlight::new(
+                    position,
+                    direction,
+                    spotlight_component.inner_angle,
+                    spotlight_component.outer_angle,
+                    spotlight_component.range,
+                ));
+            }
+        }
+    }
+
+    spotlights
+}

src/systems/tree_dissolve.rs

@@ -0,0 +1,112 @@
+use crate::components::DissolveComponent;
+use crate::world::World;
+use glam::Vec3;
+
+pub fn tree_dissolve_update_system(world: &mut World, delta: f32)
+{
+    for entity in world.dissolves.all()
+    {
+        if let Some(dissolve) = world.dissolves.get_mut(entity)
+        {
+            let diff = dissolve.target_amount - dissolve.amount;
+            dissolve.amount += diff * dissolve.transition_speed * delta;
+            dissolve.amount = dissolve.amount.clamp(0.0, 1.0);
+        }
+    }
+}
+
+pub fn tree_occlusion_system(world: &mut World)
+{
+    let player_entity = world.player_tags.all().first().copied();
+    let player_pos = player_entity.and_then(|e| world.transforms.get(e).map(|t| t.position));
+
+    if let Some(player_pos) = player_pos
+    {
+        let camera_entity = world.cameras.get_active().map(|(e, _)| e);
+        let camera_pos = camera_entity.and_then(|e| world.transforms.get(e).map(|t| t.position));
+
+        let tree_count = world.tree_tags.all().len();
+        if tree_count > 0
+        {
+            static mut FRAME_COUNT: u32 = 0;
+            unsafe {
+                FRAME_COUNT += 1;
+                if FRAME_COUNT % 60 == 0
+                {
+                    println!("Tree occlusion system: {} trees detected", tree_count);
+                }
+            }
+        }
+
+        if let Some(camera_pos) = camera_pos
+        {
+            let to_player = player_pos - camera_pos;
+            let distance_to_player = to_player.length();
+
+            if distance_to_player < 0.01
+            {
+                return;
+            }
+
+            let to_player_normalized = to_player.normalize();
+
+            for tree_entity in world.tree_tags.all()
+            {
+                if let Some(tree_transform) = world.transforms.get(tree_entity)
+                {
+                    let tree_pos = tree_transform.position;
+                    let to_tree = tree_pos - camera_pos;
+                    let distance_to_tree = to_tree.length();
+
+                    if distance_to_tree < distance_to_player
+                    {
+                        let projection = to_tree.dot(to_player_normalized);
+
+                        if projection > 0.0
+                        {
+                            let perpendicular_vec = to_tree - to_player_normalized * projection;
+                            let perp_distance = perpendicular_vec.length();
+
+                            let occlusion_radius = 2.5;
+
+                            if perp_distance < occlusion_radius
+                            {
+                                let dissolve_amount =
+                                    1.0 - (perp_distance / occlusion_radius).clamp(0.0, 1.0);
+
+                                static mut DEBUG_FRAME: u32 = 0;
+                                unsafe {
+                                    DEBUG_FRAME += 1;
+                                    if DEBUG_FRAME % 60 == 0
+                                    {
+                                        println!(
+                                            "Tree occluding! perp_dist: {:.2}, dissolve: {:.2}",
+                                            perp_distance, dissolve_amount
+                                        );
+                                    }
+                                }
+
+                                if let Some(dissolve) = world.dissolves.get_mut(tree_entity)
+                                {
+                                    dissolve.target_amount = dissolve_amount;
+                                }
+                                else
+                                {
+                                    let mut dissolve = DissolveComponent::new();
+                                    dissolve.target_amount = dissolve_amount;
+                                    world.dissolves.insert(tree_entity, dissolve);
+                                }
+                                continue;
+                            }
+                        }
+                    }
+
+                    if let Some(dissolve) = world.dissolves.get_mut(tree_entity)
+                    {
+                        dissolve.target_amount = 0.0;
+                    }
+                }
+            }
+        }
+    }
+}

src/terrain.rs

@@ -7,11 +7,12 @@ use rapier3d::{
     math::Isometry,
     prelude::{ColliderBuilder, RigidBodyBuilder},
 };
+use wesl::Wesl;
 
 use crate::{
     components::{MeshComponent, PhysicsComponent},
     entity::EntityHandle,
-    mesh::{InstanceRaw, Mesh, Vertex},
+    mesh::{InstanceData, InstanceRaw, Mesh, Vertex},
     physics::PhysicsManager,
     render,
     world::{Transform, World},
@@ -39,7 +40,7 @@ impl TerrainConfig
     {
         Self {
             gltf_path: "meshes/terrain.gltf".to_string(),
-            heightmap_path: "textures/terrain.exr".to_string(),
+            heightmap_path: "textures/terrain_heightmap.exr".to_string(),
             size: Vec2::new(1000.0, 1000.0),
         }
     }
@@ -49,111 +50,102 @@ pub struct Terrain;
 
 impl Terrain
 {
-    pub fn spawn(world: &mut World, config: &TerrainConfig) -> anyhow::Result<EntityHandle>
+    pub fn spawn(
+        world: &mut World,
+        mesh_data: Vec<(Mesh, Vec<InstanceData>)>,
+        config: &TerrainConfig,
+    ) -> anyhow::Result<EntityHandle>
     {
-        let gltf_data = render::with_device(|device| {
-            Mesh::load_gltf_with_instances(device, &config.gltf_path)
-        })?;
-
-        let terrain_entity = world.spawn();
         let transform = Transform::IDENTITY;
+        let mut first_entity = None;
+        let mut physics_added = false;
 
-        let mut terrain_mesh = None;
-        let mut tree_mesh = None;
-        let mut tree_instances = None;
-
-        for (mesh, instances) in gltf_data
+        for (mesh, instances) in mesh_data
         {
+            let entity = world.spawn();
+
+            if first_entity.is_none()
+            {
+                first_entity = Some(entity);
+            }
+
             if instances.is_empty()
             {
-                if terrain_mesh.is_none()
+                world.transforms.insert(entity, transform);
+                world.meshes.insert(
+                    entity,
+                    MeshComponent {
+                        mesh: Rc::new(mesh),
+                        pipeline: render::Pipeline::Terrain,
+                        instance_buffer: None,
+                        num_instances: 1,
+                    },
+                );
+
+                if !physics_added
                 {
-                    terrain_mesh = Some(mesh);
+                    let heights = Self::load_heightfield_from_exr(&config.heightmap_path)?;
+
+                    let height_scale = 1.0;
+                    let scale = vector![config.size.x, height_scale, config.size.y];
+
+                    let body = RigidBodyBuilder::fixed()
+                        .translation(transform.get_position().into())
+                        .build();
+
+                    let rigidbody_handle = PhysicsManager::add_rigidbody(body);
+
+                    let collider = ColliderBuilder::heightfield(heights.clone(), scale).build();
+
+                    let collider_handle =
+                        PhysicsManager::add_collider(collider, Some(rigidbody_handle));
+
+                    PhysicsManager::set_heightfield_data(
+                        heights,
+                        scale,
+                        transform.get_position().into(),
+                    );
+
+                    world.physics.insert(
+                        entity,
+                        PhysicsComponent {
+                            rigidbody: rigidbody_handle,
+                            collider: Some(collider_handle),
+                        },
+                    );
+
+                    physics_added = true;
                 }
             }
             else
             {
-                tree_mesh = Some(mesh);
-                tree_instances = Some(instances);
+                let num_instances = instances.len();
+
+                let instance_raw: Vec<InstanceRaw> = instances.iter().map(|i| i.to_raw()).collect();
+
+                let instance_buffer = render::with_device(|device| {
+                    use wgpu::util::DeviceExt;
+                    device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
+                        label: Some("Tree Instance Buffer"),
+                        contents: bytemuck::cast_slice(&instance_raw),
+                        usage: wgpu::BufferUsages::VERTEX,
+                    })
+                });
+
+                world.transforms.insert(entity, Transform::IDENTITY);
+                world.meshes.insert(
+                    entity,
+                    MeshComponent {
+                        mesh: Rc::new(mesh),
+                        pipeline: render::Pipeline::Environment,
+                        instance_buffer: Some(instance_buffer),
+                        num_instances: num_instances as u32,
+                    },
+                );
             }
         }
 
-        if let Some(terrain_mesh) = terrain_mesh
-        {
-            world.transforms.insert(terrain_entity, transform);
-            world.meshes.insert(
-                terrain_entity,
-                MeshComponent {
-                    mesh: Rc::new(terrain_mesh),
-                    pipeline: render::Pipeline::Terrain,
-                    instance_buffer: None,
-                    num_instances: 1,
-                },
-            );
-
-            let heights = Self::load_heightfield_from_exr(&config.heightmap_path)?;
-
-            println!(
-                "Loaded terrain: {} rows × {} cols heightfield from EXR",
-                heights.nrows(),
-                heights.ncols()
-            );
-
-            let height_scale = 1.0;
-            let scale = vector![config.size.x, height_scale, config.size.y];
-
-            let body = RigidBodyBuilder::fixed()
-                .translation(transform.get_position().into())
-                .build();
-
-            let rigidbody_handle = PhysicsManager::add_rigidbody(body);
-
-            let collider = ColliderBuilder::heightfield(heights.clone(), scale).build();
-
-            let collider_handle = PhysicsManager::add_collider(collider, Some(rigidbody_handle));
-
-            PhysicsManager::set_heightfield_data(heights, scale, transform.get_position().into());
-
-            world.physics.insert(
-                terrain_entity,
-                PhysicsComponent {
-                    rigidbody: rigidbody_handle,
-                    collider: Some(collider_handle),
-                },
-            );
-        }
-
-        if let (Some(tree_mesh), Some(instances)) = (tree_mesh, tree_instances)
-        {
-            let num_instances = instances.len();
-            println!("Loaded {} tree instances", num_instances);
-
-            let tree_entity = world.spawn();
-
-            let instance_raw: Vec<InstanceRaw> = instances.iter().map(|i| i.to_raw()).collect();
-
-            let instance_buffer = render::with_device(|device| {
-                use wgpu::util::DeviceExt;
-                device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
-                    label: Some("Tree Instance Buffer"),
-                    contents: bytemuck::cast_slice(&instance_raw),
-                    usage: wgpu::BufferUsages::VERTEX,
-                })
-            });
-
-            world.transforms.insert(tree_entity, Transform::IDENTITY);
-            world.meshes.insert(
-                tree_entity,
-                MeshComponent {
-                    mesh: Rc::new(tree_mesh),
-                    pipeline: render::Pipeline::Render,
-                    instance_buffer: Some(instance_buffer),
-                    num_instances: num_instances as u32,
-                },
-            );
-        }
-
-        Ok(terrain_entity)
+        first_entity.ok_or_else(|| anyhow::anyhow!("No meshes found in glTF file"))
     }
 
     fn load_heightfield_from_exr(path: &str) -> anyhow::Result<DMatrix<f32>>
@@ -184,11 +176,12 @@ pub fn create_terrain_render_pipeline(
     bind_group_layout: &wgpu::BindGroupLayout,
 ) -> wgpu::RenderPipeline
 {
-    let shared_source =
-        std::fs::read_to_string("shaders/shared.wgsl").expect("Failed to read shared shader");
-    let terrain_source =
-        std::fs::read_to_string("shaders/terrain.wgsl").expect("Failed to read terrain shader");
-    let shader_source = format!("{}\n{}", shared_source, terrain_source);
+    let compiler = Wesl::new("src/shaders");
+    let shader_source = compiler
+        .compile(&"package::terrain".parse().unwrap())
+        .inspect_err(|e| eprintln!("WESL error: {e}"))
+        .unwrap()
+        .to_string();
 
     let shader = device.create_shader_module(wgpu::ShaderModuleDescriptor {
         label: Some("Terrain Shader"),

src/texture.rs

@@ -1,6 +1,5 @@
 use anyhow::Result;
 use exr::prelude::{ReadChannels, ReadLayers};
-use half::f16;
 
 pub struct DitherTextures
 {
@@ -16,6 +15,13 @@ pub struct FlowmapTexture
     pub sampler: wgpu::Sampler,
 }
 
+pub struct HeightmapTexture
+{
+    pub texture: wgpu::Texture,
+    pub view: wgpu::TextureView,
+    pub sampler: wgpu::Sampler,
+}
+
 impl DitherTextures
 {
     pub fn load_octaves(device: &wgpu::Device, queue: &wgpu::Queue) -> Result<Self>
@@ -186,16 +192,11 @@ impl FlowmapTexture
             mip_level_count: 1,
             sample_count: 1,
             dimension: wgpu::TextureDimension::D2,
-            format: wgpu::TextureFormat::Rgba16Float,
+            format: wgpu::TextureFormat::Rgba32Float,
             usage: wgpu::TextureUsages::TEXTURE_BINDING | wgpu::TextureUsages::COPY_DST,
             view_formats: &[],
         });
 
-        let rgba_data_f16: Vec<u16> = rgba_data
-            .iter()
-            .map(|&f| f16::from_f32(f).to_bits())
-            .collect();
-
         queue.write_texture(
             wgpu::TexelCopyTextureInfo {
                 texture: &texture,
@@ -203,10 +204,10 @@ impl FlowmapTexture
                 origin: wgpu::Origin3d::ZERO,
                 aspect: wgpu::TextureAspect::All,
             },
-            bytemuck::cast_slice(&rgba_data_f16),
+            bytemuck::cast_slice(&rgba_data),
             wgpu::TexelCopyBufferLayout {
                 offset: 0,
-                bytes_per_row: Some(8 * width as u32),
+                bytes_per_row: Some(16 * width as u32),
                 rows_per_image: Some(height as u32),
             },
             wgpu::Extent3d {
@@ -223,8 +224,8 @@ impl FlowmapTexture
             address_mode_u: wgpu::AddressMode::Repeat,
             address_mode_v: wgpu::AddressMode::Repeat,
             address_mode_w: wgpu::AddressMode::Repeat,
-            mag_filter: wgpu::FilterMode::Linear,
-            min_filter: wgpu::FilterMode::Linear,
+            mag_filter: wgpu::FilterMode::Nearest,
+            min_filter: wgpu::FilterMode::Nearest,
             mipmap_filter: wgpu::FilterMode::Nearest,
             ..Default::default()
         });
@@ -236,3 +237,76 @@ impl FlowmapTexture
         })
     }
 }
+
+impl HeightmapTexture
+{
+    pub fn load(device: &wgpu::Device, queue: &wgpu::Queue, path: &str) -> Result<Self>
+    {
+        let image = exr::prelude::read()
+            .no_deep_data()
+            .largest_resolution_level()
+            .all_channels()
+            .all_layers()
+            .all_attributes()
+            .from_file(path)?;
+
+        let layer = &image.layer_data[0];
+        let width = layer.size.width();
+        let height = layer.size.height();
+
+        let channel = &layer.channel_data.list[0];
+        let height_data: Vec<f32> = channel.sample_data.values_as_f32().collect();
+
+        let texture = device.create_texture(&wgpu::TextureDescriptor {
+            label: Some("Heightmap Texture"),
+            size: wgpu::Extent3d {
+                width: width as u32,
+                height: height as u32,
+                depth_or_array_layers: 1,
+            },
+            mip_level_count: 1,
+            sample_count: 1,
+            dimension: wgpu::TextureDimension::D2,
+            format: wgpu::TextureFormat::R32Float,
+            usage: wgpu::TextureUsages::TEXTURE_BINDING | wgpu::TextureUsages::COPY_DST,
+            view_formats: &[],
+        });
+
+        queue.write_texture(
+            wgpu::TexelCopyTextureInfo {
+                texture: &texture,
+                mip_level: 0,
+                origin: wgpu::Origin3d::ZERO,
+                aspect: wgpu::TextureAspect::All,
+            },
+            bytemuck::cast_slice(&height_data),
+            wgpu::TexelCopyBufferLayout {
+                offset: 0,
+                bytes_per_row: Some(4 * width as u32),
+                rows_per_image: Some(height as u32),
+            },
+            wgpu::Extent3d {
+                width: width as u32,
+                height: height as u32,
+                depth_or_array_layers: 1,
+            },
+        );
+
+        let view = texture.create_view(&wgpu::TextureViewDescriptor::default());
+
+        let sampler = device.create_sampler(&wgpu::SamplerDescriptor {
+            label: Some("Heightmap Sampler"),
+            address_mode_u: wgpu::AddressMode::ClampToEdge,
+            address_mode_v: wgpu::AddressMode::ClampToEdge,
+            mag_filter: wgpu::FilterMode::Nearest,
+            min_filter: wgpu::FilterMode::Nearest,
+            ..Default::default()
+        });
+
+        Ok(Self {
+            texture,
+            view,
+            sampler,
+        })
+    }
+}

src/utility/transform.rs

@@ -22,6 +22,16 @@ impl Transform
         Self::IDENTITY.translated(position)
     }
 
+    pub fn from_matrix(matrix: Mat4) -> Self
+    {
+        let (scale, rotation, position) = matrix.to_scale_rotation_translation();
+        Self {
+            position,
+            rotation,
+            scale,
+        }
+    }
+
     pub fn to_matrix(&self) -> Mat4
     {
         Mat4::from_scale_rotation_translation(self.scale, self.rotation, self.position)

src/world.rs

@@ -1,9 +1,12 @@
 use std::collections::HashMap;
 
+use crate::components::dissolve::DissolveComponent;
+use crate::components::follow::FollowComponent;
 use crate::components::jump::JumpComponent;
+use crate::components::lights::spot::SpotlightComponent;
 use crate::components::{
-    CameraComponent, CameraFollowComponent, InputComponent, MeshComponent, MovementComponent,
-    PhysicsComponent,
+    CameraComponent, InputComponent, MeshComponent, MovementComponent, PhysicsComponent,
+    RotateComponent,
 };
 use crate::entity::{EntityHandle, EntityManager};
 use crate::state::StateMachine;
@@ -415,12 +418,12 @@ impl CameraStorage
     }
 }
 
-pub struct CameraFollowStorage
+pub struct SpotlightStorage
 {
-    pub components: HashMap<EntityHandle, CameraFollowComponent>,
+    pub components: HashMap<EntityHandle, SpotlightComponent>,
 }
 
-impl CameraFollowStorage
+impl SpotlightStorage
 {
     pub fn new() -> Self
     {
@@ -429,26 +432,159 @@ impl CameraFollowStorage
         }
     }
 
-    pub fn insert(&mut self, entity: EntityHandle, component: CameraFollowComponent)
+    pub fn insert(&mut self, entity: EntityHandle, component: SpotlightComponent)
     {
         self.components.insert(entity, component);
     }
 
-    pub fn get(&self, entity: EntityHandle) -> Option<&CameraFollowComponent>
+    pub fn get(&self, entity: EntityHandle) -> Option<&SpotlightComponent>
     {
         self.components.get(&entity)
     }
 
-    pub fn get_mut(&mut self, entity: EntityHandle) -> Option<&mut CameraFollowComponent>
+    pub fn get_mut(&mut self, entity: EntityHandle) -> Option<&mut SpotlightComponent>
     {
         self.components.get_mut(&entity)
     }
 
-    pub fn with_mut<F, R>(&mut self, entity: EntityHandle, f: F) -> Option<R>
-    where
-        F: FnOnce(&mut CameraFollowComponent) -> R,
+    pub fn remove(&mut self, entity: EntityHandle)
     {
-        self.components.get_mut(&entity).map(f)
+        self.components.remove(&entity);
+    }
+
+    pub fn all(&self) -> Vec<EntityHandle>
+    {
+        self.components.keys().copied().collect()
+    }
+}
+
+pub struct TreeTagStorage
+{
+    pub components: HashMap<EntityHandle, ()>,
+}
+
+impl TreeTagStorage
+{
+    pub fn new() -> Self
+    {
+        Self {
+            components: HashMap::new(),
+        }
+    }
+
+    pub fn insert(&mut self, entity: EntityHandle)
+    {
+        self.components.insert(entity, ());
+    }
+
+    pub fn remove(&mut self, entity: EntityHandle)
+    {
+        self.components.remove(&entity);
+    }
+
+    pub fn all(&self) -> Vec<EntityHandle>
+    {
+        self.components.keys().copied().collect()
+    }
+}
+
+pub struct DissolveStorage
+{
+    pub components: HashMap<EntityHandle, DissolveComponent>,
+}
+
+impl DissolveStorage
+{
+    pub fn new() -> Self
+    {
+        Self {
+            components: HashMap::new(),
+        }
+    }
+
+    pub fn insert(&mut self, entity: EntityHandle, component: DissolveComponent)
+    {
+        self.components.insert(entity, component);
+    }
+
+    pub fn get(&self, entity: EntityHandle) -> Option<&DissolveComponent>
+    {
+        self.components.get(&entity)
+    }
+
+    pub fn get_mut(&mut self, entity: EntityHandle) -> Option<&mut DissolveComponent>
+    {
+        self.components.get_mut(&entity)
+    }
+
+    pub fn remove(&mut self, entity: EntityHandle)
+    {
+        self.components.remove(&entity);
+    }
+
+    pub fn all(&self) -> Vec<EntityHandle>
+    {
+        self.components.keys().copied().collect()
+    }
+}
+
+pub struct FollowStorage
+{
+    pub components: HashMap<EntityHandle, FollowComponent>,
+}
+
+impl FollowStorage
+{
+    pub fn new() -> Self
+    {
+        Self {
+            components: HashMap::new(),
+        }
+    }
+
+    pub fn insert(&mut self, entity: EntityHandle, component: FollowComponent)
+    {
+        self.components.insert(entity, component);
+    }
+
+    pub fn get(&self, entity: EntityHandle) -> Option<&FollowComponent>
+    {
+        self.components.get(&entity)
+    }
+
+    pub fn remove(&mut self, entity: EntityHandle)
+    {
+        self.components.remove(&entity);
+    }
+
+    pub fn all(&self) -> Vec<EntityHandle>
+    {
+        self.components.keys().copied().collect()
+    }
+}
+
+pub struct RotateStorage
+{
+    pub components: HashMap<EntityHandle, RotateComponent>,
+}
+
+impl RotateStorage
+{
+    pub fn new() -> Self
+    {
+        Self {
+            components: HashMap::new(),
+        }
+    }
+
+    pub fn insert(&mut self, entity: EntityHandle, component: RotateComponent)
+    {
+        self.components.insert(entity, component);
+    }
+
+    pub fn get(&self, entity: EntityHandle) -> Option<&RotateComponent>
+    {
+        self.components.get(&entity)
     }
 
     pub fn remove(&mut self, entity: EntityHandle)
@@ -474,7 +610,11 @@ pub struct World
     pub player_tags: PlayerTagStorage,
     pub state_machines: StateMachineStorage,
     pub cameras: CameraStorage,
-    pub camera_follows: CameraFollowStorage,
+    pub spotlights: SpotlightStorage,
+    pub tree_tags: TreeTagStorage,
+    pub dissolves: DissolveStorage,
+    pub follows: FollowStorage,
+    pub rotates: RotateStorage,
 }
 
 impl World
@@ -492,7 +632,11 @@ impl World
             player_tags: PlayerTagStorage::new(),
             state_machines: StateMachineStorage::new(),
             cameras: CameraStorage::new(),
-            camera_follows: CameraFollowStorage::new(),
+            spotlights: SpotlightStorage::new(),
+            tree_tags: TreeTagStorage::new(),
+            dissolves: DissolveStorage::new(),
+            follows: FollowStorage::new(),
+            rotates: RotateStorage::new(),
         }
     }
 
@@ -512,7 +656,11 @@ impl World
         self.player_tags.remove(entity);
         self.state_machines.remove(entity);
         self.cameras.remove(entity);
-        self.camera_follows.remove(entity);
+        self.spotlights.remove(entity);
+        self.tree_tags.remove(entity);
+        self.dissolves.remove(entity);
+        self.follows.remove(entity);
+        self.rotates.remove(entity);
         self.entities.despawn(entity);
     }
 }

textures/scripts/README.md

@@ -0,0 +1,62 @@
+# Texture Generation Scripts
+
+## Blue Noise Generator
+
+`generate_blue_noise.py` - Generates blue noise textures for high-quality dithering effects.
+
+### Requirements
+
+```bash
+pip install numpy pillow scipy
+```
+
+### Usage
+
+Basic usage (generates 128x128 texture):
+```bash
+python generate_blue_noise.py
+```
+
+Custom size:
+```bash
+python generate_blue_noise.py --width 256 --height 256
+```
+
+Custom output path:
+```bash
+python generate_blue_noise.py --output ../my_blue_noise.png
+```
+
+Advanced options:
+```bash
+python generate_blue_noise.py --width 128 --height 128 --sigma 1.5 --method void_cluster
+```
+
+### Parameters
+
+- `--width`: Texture width in pixels (default: 128)
+- `--height`: Texture height in pixels (default: 128)
+- `--method`: Generation method
+  - `void_cluster`: High-quality void-and-cluster method (default, recommended)
+  - `annealing`: Simulated annealing method (slower)
+- `--sigma`: Gaussian kernel sigma for void_cluster method (default: 1.5)
+  - Lower values (0.8-1.2): Tighter clustering, more high-frequency
+  - Higher values (2.0-3.0): Smoother distribution
+- `--iterations`: Number of iterations (optional, auto-calculated if not specified)
+- `--output`: Output file path (default: ../blue_noise.png)
+
+### What is Blue Noise?
+
+Blue noise is a type of noise with energy concentrated in high frequencies and minimal low-frequency content. This makes it ideal for dithering because:
+
+- No visible patterns or clustering
+- Smooth gradients without banding
+- Perceptually pleasing distribution
+- Better than Bayer or white noise for transparency effects
+
+### Use Cases in snow_trail_sdl
+
+- **Tree dissolve effect**: Dither trees between camera and player for unobstructed view
+- **Temporal effects**: Screen-space dithering for transitions
+- **Transparency**: High-quality alpha dithering
+- **LOD transitions**: Smooth fade between detail levels

textures/scripts/generate_blue_noise.py

@@ -0,0 +1,155 @@
+#!/usr/bin/env python3
+
+import numpy as np
+from PIL import Image
+import argparse
+from pathlib import Path
+
+def gaussian_kernel(size, sigma):
+    x = np.arange(-size // 2 + 1, size // 2 + 1)
+    y = np.arange(-size // 2 + 1, size // 2 + 1)
+    xx, yy = np.meshgrid(x, y)
+    kernel = np.exp(-(xx**2 + yy**2) / (2 * sigma**2))
+    return kernel / kernel.sum()
+
+def apply_periodic_filter(binary_pattern, kernel):
+    from scipy.signal import fftconvolve
+    return fftconvolve(binary_pattern, kernel, mode='same')
+
+def generate_blue_noise_void_cluster(width, height, sigma=1.5, iterations=None):
+    if iterations is None:
+        iterations = width * height
+
+    size = width * height
+    pattern = np.zeros((height, width), dtype=np.float32)
+
+    kernel_size = int(6 * sigma)
+    if kernel_size % 2 == 0:
+        kernel_size += 1
+    kernel = gaussian_kernel(kernel_size, sigma)
+
+    initial_pattern = np.random.rand(height, width)
+
+    print(f"Generating {width}x{height} blue noise texture...")
+    print(f"Kernel size: {kernel_size}x{kernel_size}, sigma: {sigma}")
+
+    dither_array = np.zeros(size, dtype=np.int32)
+    binary_pattern = np.zeros((height, width), dtype=np.float32)
+
+    for i in range(size):
+        if i % (size // 10) == 0:
+            print(f"Progress: {i}/{size} ({100*i//size}%)")
+
+        filtered = apply_periodic_filter(binary_pattern, kernel)
+
+        if i < size // 2:
+            initial_energy = initial_pattern + filtered
+            coords = np.unravel_index(np.argmax(initial_energy), initial_energy.shape)
+        else:
+            coords = np.unravel_index(np.argmin(filtered), filtered.shape)
+
+        dither_array[i] = coords[0] * width + coords[1]
+        binary_pattern[coords[0], coords[1]] = 1.0
+
+    print("Converting to threshold map...")
+
+    threshold_map = np.zeros((height, width), dtype=np.float32)
+    for rank, pos in enumerate(dither_array):
+        y = pos // width
+        x = pos % width
+        threshold_map[y, x] = rank / size
+
+    print("Done!")
+    return threshold_map
+
+def generate_blue_noise_simulated_annealing(width, height, iterations=10000):
+    print(f"Generating {width}x{height} blue noise using simulated annealing...")
+
+    pattern = np.random.rand(height, width)
+
+    def energy(pattern):
+        fft = np.fft.fft2(pattern)
+        power = np.abs(fft) ** 2
+
+        h, w = pattern.shape
+        cy, cx = h // 2, w // 2
+        y, x = np.ogrid[:h, :w]
+        dist = np.sqrt((x - cx)**2 + (y - cy)**2)
+
+        low_freq_mask = dist < min(h, w) * 0.1
+        low_freq_energy = np.sum(power * low_freq_mask)
+
+        return low_freq_energy
+
+    current_energy = energy(pattern)
+    temperature = 1.0
+    cooling_rate = 0.9995
+
+    for i in range(iterations):
+        if i % (iterations // 10) == 0:
+            print(f"Iteration {i}/{iterations}, Energy: {current_energy:.2f}, Temp: {temperature:.4f}")
+
+        y1, x1 = np.random.randint(0, height), np.random.randint(0, width)
+        y2, x2 = np.random.randint(0, height), np.random.randint(0, width)
+
+        pattern[y1, x1], pattern[y2, x2] = pattern[y2, x2], pattern[y1, x1]
+
+        new_energy = energy(pattern)
+        delta_energy = new_energy - current_energy
+
+        if delta_energy < 0 or np.random.rand() < np.exp(-delta_energy / temperature):
+            current_energy = new_energy
+        else:
+            pattern[y1, x1], pattern[y2, x2] = pattern[y2, x2], pattern[y1, x1]
+
+        temperature *= cooling_rate
+
+    print("Done!")
+    return pattern
+
+def main():
+    parser = argparse.ArgumentParser(description='Generate blue noise texture for dithering')
+    parser.add_argument('--width', type=int, default=128, help='Texture width (default: 128)')
+    parser.add_argument('--height', type=int, default=128, help='Texture height (default: 128)')
+    parser.add_argument('--method', choices=['void_cluster', 'annealing'], default='void_cluster',
+                        help='Generation method (default: void_cluster)')
+    parser.add_argument('--sigma', type=float, default=1.5,
+                        help='Gaussian kernel sigma for void_cluster method (default: 1.5)')
+    parser.add_argument('--iterations', type=int, default=None,
+                        help='Number of iterations (optional)')
+    parser.add_argument('--output', type=str, default='../blue_noise.png',
+                        help='Output file path (default: ../blue_noise.png)')
+
+    args = parser.parse_args()
+
+    try:
+        from scipy.signal import fftconvolve
+    except ImportError:
+        print("Error: scipy is required for this script.")
+        print("Install it with: pip install scipy")
+        return
+
+    if args.method == 'void_cluster':
+        noise = generate_blue_noise_void_cluster(args.width, args.height, args.sigma, args.iterations)
+    else:
+        noise = generate_blue_noise_simulated_annealing(args.width, args.height,
+                                                         args.iterations or 10000)
+
+    noise_normalized = ((noise - noise.min()) / (noise.max() - noise.min()) * 255).astype(np.uint8)
+
+    img = Image.fromarray(noise_normalized, mode='L')
+
+    output_path = Path(__file__).parent / args.output
+    output_path.parent.mkdir(parents=True, exist_ok=True)
+    img.save(output_path)
+
+    print(f"\nBlue noise texture saved to: {output_path}")
+    print(f"Size: {args.width}x{args.height}")
+    print(f"Method: {args.method}")
+
+    fft = np.fft.fft2(noise)
+    power_spectrum = np.abs(np.fft.fftshift(fft)) ** 2
+    print(f"Power spectrum range: {power_spectrum.min():.2e} - {power_spectrum.max():.2e}")
+
+if __name__ == '__main__':
+    main()