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Bevy Spatial Queries
Docs-first stub for Bevy spatial queries. Godot counterpart: godot-raycasting-queries. Not a full port. Keywords: Bevy, raycast, shapecast, picking, physics query, gaps.
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 spatial queries (docs-first stub) Not a full port. Casts, overlaps, and physics picking wait on a solver. No crate was chosen. ## When to use Load this when a design needs line of sight, a volume overlap, a ground probe, or a mouse pick, and you need the gap list. Screen-to-2D-world mapping that does not hit a collider is a camera helper, not a physics query. ## ECS shape - **Components** would own query origin, direction, and a mask once a solver defines them. This pass does not name those types. - **Resources** would own a physics world. None was opened. - **Systems** would run the query after the solver step. Order that with `.chain()` on the ECS page. The clock is `Fixed` / `FixedMain` from `bevy::time`, which is not a query API. - **Camera-only pick (opened elsewhere):** `Camera::viewport_to_world_2d` with `GlobalTransform` maps a viewport position to a 2D world position. That is not an intersection test. See bevy-camera-systems. ## Godot idea to Bevy idiom | Idea | Bevy idiom (idea only) | | --- | --- | | Ray or shape cast | Unverified until a solver page is opened. Route the gap to bevy-physics-2d or bevy-physics-3d | | Mouse position in 2D world | `viewport_to_world_2d` on a `Camera` (bevy-camera-systems). Collider hit is still a gap | | Exclude the caster | Unverified. Do not copy Godot RID exclude lists | | Field-of-view fan | Design data on components. No sensor API was opened | ## Gaps - The opened `bevy` 0.20.0 feature list has no physics-engine feature, so there is no ray, shape, point, or sweep query to cite. - Third-party plugins may be added with `add_plugins`. This pass did not open a query API on any physics crate. - Piercing casts, reflection from normals, and ground volumes are unverified. ## 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 ray, shape-cast, or direct-space-state types. WHY: a Godot port, an unopened API, or a public lie fails the docs-first bar. - No Avian, Rapier, or any other named physics crate as the chosen solver. WHY: a Godot port, an unopened API, or a public lie fails the docs-first bar. - No invented `intersect_ray` or mask APIs. 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. No spatial-query module was opened. - [Assets](https://bevy.org/assets/) - Official asset catalog. No query plugin 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/) - Systems, `Query`, and `.chain()`. - [bevy::camera](https://docs.rs/bevy/latest/bevy/camera/index.html) - `viewport_to_world_2d` is a camera map, not a collider query. Details live on bevy-camera-systems. - [Quick Start: plugins](https://bevy.org/learn/quick-start/getting-started/plugins/) - Third-party `add_plugins` without a chosen crate. ### Related Skills #### Prerequisites - [bevy-master](https://github.com/thedivergentai/gd-agentic-skills/blob/main/skills/bevy-master/SKILL.md) - ECS ownership. - [bevy-camera-systems](https://github.com/thedivergentai/gd-agentic-skills/blob/main/skills/bevy-camera-systems/SKILL.md) - Viewport to 2D world, without a hit test. #### Complements - [bevy-physics-2d](https://github.com/thedivergentai/gd-agentic-skills/blob/main/skills/bevy-physics-2d/SKILL.md) - 2D solver gap. - [bevy-physics-3d](https://github.com/thedivergentai/gd-agentic-skills/blob/main/skills/bevy-physics-3d/SKILL.md) - 3D solver gap. - [godot-raycasting-queries](https://github.com/thedivergentai/gd-agentic-skills/blob/main/skills/godot-raycasting-queries/SKILL.md) - Godot counterpart. Source idea only. #### Downstream / consumers - [bevy-ai-navigation](https://github.com/thedivergentai/gd-agentic-skills/blob/main/skills/bevy-ai-navigation/SKILL.md) - Sensors stay a gap until queries exist. #### Master - [bevy-master](https://github.com/thedivergentai/gd-agentic-skills/blob/main/skills/bevy-master/SKILL.md) - Bevy router.