bevy-rendering

name	bevy-rendering
description	Reference for Bevy's rendering pipeline — wgpu, render graph, extract/prepare/queue/draw stages, meshes, materials, lighting, and text rendering.
metadata	{"crate":"bevy_render","bevy":"0.19"}

Graphics stack

Bevy Engine → wgpu → Graphics API (Vulkan/Metal/DX12/WebGPU) → GPU Driver → GPU Hardware

Frame structure

Each frame: Simulation (game logic) + Rendering (drawing) run in parallel.

Render pipeline (5 steps)

1. Extract — copy render data from game world (sync point, keep fast)
2. Prepare — set up vertex data, write vertex buffers
3. Queue — create pipelines, bind groups, add entities to render phases
4. Render Graph — acyclic graph of nodes generating GPU commands
5. Draw Functions — execute draw calls via RenderCommand

Render Graph

• Nodes — generate draw calls, operate on slots
• Edges — execution order, connect input/output slots
• Slots — describe render resources

Supports sub-graphs (e.g., "2d" and "3d" for different parts of the game).

Meshes

Built-in 3D: Cuboid, Sphere, Cylinder, Capsule3D, Cone, Torus, Triangle3D, Tetrahedron, Plane3D

Built-in 2D: Circle, Rectangle, Triangle2d, Capsule2d, Ellipse, RegularPolygon, Arc2d, and more.

Materials

PBR properties: Color, Metallic, Roughness, Reflectance, Clear Coat, Anisotropy.

Rendering entities

commands.spawn((
  Mesh2d(meshes.add(Circle::new(50.))),
  MeshMaterial2d(materials.add(ColorMaterial::from(RED))),
  Transform::from_xyz(-150., 0., 0.),
));

Lighting

commands.spawn((
  PointLight { shadows_enabled: true, intensity: 10_000_000., range: 100.0, ..default() },
  Transform::from_xyz(0., 10., 0.),
));

Types: PointLight, SpotLight, DirectionalLight.

Text rendering

UI text (Text) or scene text (Text2d):

// Scene text
commands.spawn((
  Text2d::new("Hello"),
  TextColor(Color::WHITE),
  TextFont { font_size: 60.0, ..default() },
  TextLayout::new_with_justify(Justify::Center),
));