Notre avis

Fournit les principes essentiels du développement de jeux 3D : rendu, shaders, physique, caméras, éclairage et niveaux de détail.

Points forts

Couvre les concepts 3D fondamentaux de manière structurée
Inclut des techniques d'optimisation comme l'élimination par frustum et les LOD
Présente des anti-patterns clairs et des bonnes pratiques

Limites

Aperçu de haut niveau, non spécifique à un moteur de jeu
Manque d'exemples de code ou de détails d'implémentation
Ne traite pas de l'animation ni de l'audio

Quand l'utiliser

À utiliser lors de la conception ou de l'optimisation de systèmes de jeux 3D pour un rappel rapide des principes clés.

Quand l'éviter

Ne pas utiliser pour des tutoriels spécifiques à une plateforme ou quand des conseils d'implémentation approfondis sont nécessaires.

Exemples

Setup a 3D scene

Create a 3D scene with a third-person camera, directional light, and a simple object with a box collider.

Optimize rendering

How can I use frustum culling and LOD to improve my game's rendering performance?

Write custom shader

Write a toon shader for a stylized 3D game.

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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