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Bevy Adapt 2d To 3d
Docs-first stub for moving a Bevy game from 2D to 3D. Godot counterpart: godot-adapt-2d-to-3d. Keywords: Bevy, 2D, 3D, adapt, camera, sprite.
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 adapt 2D to 3D (docs-first stub) Not a full port. Docs-first stub. Godot counterpart: godot-adapt-2d-to-3d. ## When to use Load this when a 2D design should gain a 3D camera and meshes. Keep gameplay components. Swap render and motion representations. ## ECS shape - **Cameras:** `Camera2d` and `Camera3d` are already documented on bevy-camera-systems. An entity should not keep both as if they were one camera mode unless that skill says so. - **Draw:** `Sprite` is 2D. Meshes and `StandardMaterial` are 3D (bevy-3d-materials). - **Features:** the crate page separates `2d` and `3d` profiles. Enabling 3D does not delete 2D types. - **Motion:** bevy-character-movement stays the locomotion skill. A 3D velocity is still your component until a solver exists. ## Godot idea to Bevy idiom | Idea | Bevy idiom (idea only) | | --- | --- | | Sprite actor | A mesh entity plus the same gameplay components. | | 2D camera | Camera3d via bevy-camera-systems. | | Tile world | No tilemap type. See bevy-tilemap and bevy-3d-world-building. | ## Gaps - A conversion helper that rewrites entities from 2D to 3D was not opened. - Physics solver choice is still open on both physics skills. ## 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 node convert-to-3D operations. 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`. ### 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-camera-systems](https://github.com/thedivergentai/gd-agentic-skills/blob/main/skills/bevy-camera-systems/SKILL.md) - Camera2d and Camera3d. - [bevy-3d-world-building](https://github.com/thedivergentai/gd-agentic-skills/blob/main/skills/bevy-3d-world-building/SKILL.md) - Level assembly. #### Complements - [bevy-adapt-3d-to-2d](https://github.com/thedivergentai/gd-agentic-skills/blob/main/skills/bevy-adapt-3d-to-2d/SKILL.md) - The reverse adapt. - [godot-adapt-2d-to-3d](https://github.com/thedivergentai/gd-agentic-skills/blob/main/skills/godot-adapt-2d-to-3d/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.