ab-aswini/3d-games
.agent-os/skills/game-development/3d-games/SKILL.md
3D game development principles. Rendering, shaders, physics, cameras.
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Last scanned: Mar 26, 2026, 11:52 AM43.0s1 file scanned
SKILL.md
- name:
- 3d-games
- description:
- 3D game development principles. Rendering, shaders, physics, cameras.
- allowed-tools:
- Read, Write, Edit, Glob, Grep
3D Game Development
Principles for 3D game systems.
1. Rendering Pipeline
Stages
1. Vertex Processing → Transform geometry
2. Rasterization → Convert to pixels
3. Fragment Processing → Color pixels
4. Output → To screen
Optimization Principles
| Technique | Purpose | | --------------------- | ----------------------- | | Frustum culling | Don't render off-screen | | Occlusion culling | Don't render hidden | | LOD | Less detail at distance | | Batching | Combine draw calls |
2. Shader Principles
Shader Types
| Type | Purpose | | ------------------ | ------------------- | | Vertex | Position, normals | | Fragment/Pixel | Color, lighting | | Compute | General computation |
When to Write Custom Shaders
- Special effects (water, fire, portals)
- Stylized rendering (toon, sketch)
- Performance optimization
- Unique visual identity
3. 3D Physics
Collision Shapes
| Shape | Use Case | | ----------- | ------------------- | | Box | Buildings, crates | | Sphere | Balls, quick checks | | Capsule | Characters | | Mesh | Terrain (expensive) |
Principles
- Simple colliders, complex visuals
- Layer-based filtering
- Raycasting for line-of-sight
4. Camera Systems
Camera Types
| Type | Use | | ---------------- | ------------------- | | Third-person | Action, adventure | | First-person | Immersive, FPS | | Isometric | Strategy, RPG | | Orbital | Inspection, editors |
Camera Feel
- Smooth following (lerp)
- Collision avoidance
- Look-ahead for movement
- FOV changes for speed
5. Lighting
Light Types
| Type | Use | | --------------- | ----------------- | | Directional | Sun, moon | | Point | Lamps, torches | | Spot | Flashlight, stage | | Ambient | Base illumination |
Performance Consideration
- Real-time shadows are expensive
- Bake when possible
- Shadow cascades for large worlds
6. Level of Detail (LOD)
LOD Strategy
| Distance | Model | | -------- | ---------------- | | Near | Full detail | | Medium | 50% triangles | | Far | 25% or billboard |
7. Anti-Patterns
| ❌ Don't | ✅ Do | | --------------------------- | --------------------- | | Mesh colliders everywhere | Simple shapes | | Real-time shadows on mobile | Baked or blob shadows | | One LOD for all distances | Distance-based LOD | | Unoptimized shaders | Profile and simplify |
Remember: 3D is about illusion. Create the impression of detail, not the detail itself.
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