Skills DirectorySearch all skills ↗AI agent skill · by @thedivergentai
Bevy 3d Lighting
Docs-first stub for Bevy 3D lights. Godot counterpart: godot-3d-lighting. Keywords: Bevy, lighting, directional, point, spot, bevy_light, PBR.
Archived 2026-10-23 · Source updated 2026-10-11 · License: LGPL-3.0. Check the original repository for the latest version.
SKILL.md instructions
# Bevy 3D lighting (docs-first stub) Not a full port. Docs-first stub. Godot counterpart: godot-3d-lighting. ## When to use Load this when a 3D scene needs lights. Materials stay on bevy-3d-materials. Shadows and GI settings beyond the module blurbs are gaps. ## ECS shape - **Module:** `bevy::light` says it provides directional, point, and spot lights, plus light probes, atmosphere, volumetrics, and shadow configuration. - **Feature:** `bevy_light` is described the same way on the crate feature list. - **PBR page names:** `DirectionalLightViewEntities`, `ExtractedDirectionalLight`, `ExtractedPointLight`, `ExtractedRectLight`, `GpuClusteredLight` (point, spot, or rectangle), `DistanceFog`, `LightProbePlugin`, `ContactShadows`. - **Systems:** light clustering and extraction are engine-owned. Gameplay only spawns light entities. ## Godot idea to Bevy idiom | Idea | Bevy idiom (idea only) | | --- | --- | | Sun | A directional light entity. Struct method list was not opened; the module states the kind exists. | | Omni or point | A point light. Same limit. | | Spot | A spot light. Same limit. | | Fog | DistanceFog on the pbr page. | | Baked GI | Irradiance volumes are a pbr module. Baking steps were not opened. | ## Gaps - Individual light struct pages (`DirectionalLight`, `PointLight`, `SpotLight`) were not opened, so fields such as intensity or shadow cascades are not named here. - `bevy_solari` is an experimental raytraced-lighting feature. Its API was not opened. - Lightmap baking workflows were not opened. ## Expert Knowledge Delta Library target in prose: **Bevy 0.20.0**. Lattice URLs stay unversioned. Opened canon only: `Component`, `Resource`, `Query`, `Commands`, `Startup`, `Update`, `Fixed` / `FixedMain` (`bevy::time`), `.chain()`, `Plugin`, `DefaultPlugins`, `MinimalPlugins`. Messages and observers are an ownership slot. This file does not invent their struct APIs. Systems run in parallel unless `.chain()` orders the ones that conflict. ### Who owns state | Piece | Owner | Who may mutate | Schedule | | --- | --- | --- | --- | | Data on one entity | `Component` | One system via `Query` | `Update` or `FixedMain` | | One value for the whole app | `Resource` | One system | `Startup` to insert, then the schedule that reads it | | Spawn | `Commands` | The spawning system | `Startup` for the initial world; later schedules for runtime spawn | | Order that must not race | `.chain()` | The chained systems only | Same schedule | | Plugin boundary | `Plugin` | `build` registers systems and resources | Before the app runs | Borrow rule: two systems that both mutably query the same component must be ordered (`.chain()`) or split so only one writes. Unrelated systems stay parallel. That is the ECS page rule, not a guess at a system-set API. ### Decision | If you need | Do this | Do not | | --- | --- | --- | | Per-entity data | `Component` + `Query` | A Godot node script | | App-wide config or clock | `Resource` | Copy the value onto every entity | | Stable simulation step | `FixedMain` and the `Fixed` clock | Tie simulation to raw frame `Update` | | Startup spawn | `Commands` in `Startup` | Spawn from a render system | | Cross-system notice that is not shared state | Message or observer slot in `bevy-events-messaging` | A new event type invented in this file | | An API this skill did not open | A Gaps row | A fabricated crate (solver, navmesh module, net, XR) | Load `references/a-gate-notes.md` for the same table plus the gap rule. ## NEVER - Do not put `/0.20.0/` in lattice URLs. WHY: permalinks stay on `latest`. The 0.20.0 pin belongs in prose once. - Do not mutably query the same component from two unordered systems. WHY: the schedule runs systems in parallel unless `.chain()` orders them. - Do not invent a physics, navigation, networking, or XR crate here. WHY: those rows are gaps, blocked, or revisit. - No Godot light node types. WHY: a Godot port, an unopened API, or a public lie fails the docs-first bar. - No Godot types in Bevy code. WHY: a Godot port, an unopened API, or a public lie fails the docs-first bar. - No invented APIs or unnamed third-party crates as the chosen solver. WHY: a Godot port, an unopened API, or a public lie fails the docs-first bar. - No Creation Station content. WHY: a Godot port, an unopened API, or a public lie fails the docs-first bar. - No umbrella skill over Godot and Bevy. WHY: a Godot port, an unopened API, or a public lie fails the docs-first bar. - Do not mark this row `ported`. It is `docs_mapped`. WHY: a Godot port, an unopened API, or a public lie fails the docs-first bar. ## Reference docs.rs links use the unversioned `latest` permalink. The library pin on bevy-master stays **0.20.0**. ### Official Documentation - [Migration guides](https://bevy.org/learn/migration-guides/introduction/) - Unversioned hop index. - [bevy crate](https://docs.rs/bevy/latest/bevy/) - Unversioned API index. Feature list opened for 0.20.0. - [Assets](https://bevy.org/assets/) - Official asset catalog. No third-party crate was selected. - [Examples](https://github.com/bevyengine/bevy/tree/latest/examples#examples) - Example tree on the `latest` branch. - [ECS](https://bevy.org/learn/quick-start/getting-started/ecs/) - `Component`, systems, `Query`, `Startup`, `Update`, and `.chain()`. - [Plugins](https://bevy.org/learn/quick-start/getting-started/plugins/) - `Plugin`, `DefaultPlugins`, `MinimalPlugins`, and `add_plugins`. - [bevy::light](https://docs.rs/bevy/latest/bevy/light/index.html) - Module blurb: directional, point, spot, probes, shadows. - [bevy::pbr](https://docs.rs/bevy/latest/bevy/pbr/index.html) - Extracted lights, fog, probes, contact shadows. ### Related Skills #### Prerequisites - [bevy-master](https://github.com/thedivergentai/gd-agentic-skills/blob/main/skills/bevy-master/SKILL.md) - Hub and schedules. - [bevy-ecs-composition](https://github.com/thedivergentai/gd-agentic-skills/blob/main/skills/bevy-ecs-composition/SKILL.md) - Components and systems. - [bevy-3d-materials](https://github.com/thedivergentai/gd-agentic-skills/blob/main/skills/bevy-3d-materials/SKILL.md) - Lit surfaces. - [bevy-camera-systems](https://github.com/thedivergentai/gd-agentic-skills/blob/main/skills/bevy-camera-systems/SKILL.md) - Camera the lights affect. #### Complements - [bevy-3d-world-building](https://github.com/thedivergentai/gd-agentic-skills/blob/main/skills/bevy-3d-world-building/SKILL.md) - Place light entities in a level. - [godot-3d-lighting](https://github.com/thedivergentai/gd-agentic-skills/blob/main/skills/godot-3d-lighting/SKILL.md) - Godot counterpart. Source idea only. #### Downstream / consumers - None yet. #### Master - [bevy-master](https://github.com/thedivergentai/gd-agentic-skills/blob/main/skills/bevy-master/SKILL.md) - Bevy router.