Notre avis

Ce skill fournit les principes fondamentaux du développement de jeux 3D : pipeline de rendu, shaders, physique, caméras, éclairage et LOD.

Points forts

Couvre les étapes clés du pipeline de rendu 3D
Donne des techniques d'optimisation concrètes (culling, LOD, batching)
Explique les types de collisions et de caméras avec des cas d'usage
Inclut une section anti-patterns pour éviter les erreurs courantes

Limites

Reste conceptuel, sans exemple de code spécifique
Ne traite pas des moteurs de jeu particuliers (Unity, Unreal)
La physique n'aborde que les formes de collision, pas la dynamique avancée

Quand l'utiliser

Utilisez ce skill lorsque vous concevez ou optimisez des systèmes 3D dans un projet de jeu, que ce soit pour le rendu, la physique ou les caméras.

Quand l'éviter

Ne l'utilisez pas pour coder un jeu 2D ou lorsque vous avez besoin d'implémentations très spécifiques à un moteur.

Exemples

Optimize rendering pipeline

I'm building a 3D game with lots of objects. How can I use frustum culling, occlusion culling, LOD, and batching to improve rendering performance?

Design a custom shader

Help me write a custom shader for a stylized water effect in my 3D game. What shader type should I use and how do I set it up?

Implement camera system

I need a third-person camera that smoothly follows the player, avoids obstacles, and shows a bit of look-ahead. How should I set it up with lerp and collision avoidance?

name: 3d-games description: "3D game development principles. Rendering, shaders, physics, cameras." allowed-tools: Read, Write, Edit, Glob, Grep risk: unknown source: community

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.

When to Use

This skill is applicable to execute the workflow or actions described in the overview.

Développement de jeux 3D

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