Add Ray2d and Ray3d primitives
#10843
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Jondolf
added
C-Feature
41 tasks
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Intersecting a plane is quite important, I frequently find uses for it. Would rather not re-implement it as an utility outside Bevy (even if it is not much math). |
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I'll add After discussion on Discord, I believe |
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Closing in favor of #10856. |
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Dec 6, 2023
…10856) # Objective A better alternative version of #10843. Currently, Bevy has a single `Ray` struct for 3D. To allow better interoperability with Bevy's primitive shapes (#10572) and some third party crates (that handle e.g. spatial queries), it would be very useful to have separate versions for 2D and 3D respectively. ## Solution Separate `Ray` into `Ray2d` and `Ray3d`. These new structs also take advantage of the new primitives by using `Direction2d`/`Direction3d` for the direction: ```rust pub struct Ray2d { pub origin: Vec2, pub direction: Direction2d, } pub struct Ray3d { pub origin: Vec3, pub direction: Direction3d, } ``` and by using `Plane2d`/`Plane3d` in `intersect_plane`: ```rust impl Ray2d { // ... pub fn intersect_plane(&self, plane_origin: Vec2, plane: Plane2d) -> Option<f32> { // ... } } ``` --- ## Changelog ### Added - `Ray2d` and `Ray3d` - `Ray2d::new` and `Ray3d::new` constructors - `Plane2d::new` and `Plane3d::new` constructors ### Removed - Removed `Ray` in favor of `Ray3d` ### Changed - `direction` is now a `Direction2d`/`Direction3d` instead of a vector, which provides guaranteed normalization - `intersect_plane` now takes a `Plane2d`/`Plane3d` instead of just a vector for the plane normal - `Direction2d` and `Direction3d` now derive `Serialize` and `Deserialize` to preserve ray (de)serialization ## Migration Guide `Ray` has been renamed to `Ray3d`. ### Ray creation Before: ```rust Ray { origin: Vec3::ZERO, direction: Vec3::new(0.5, 0.6, 0.2).normalize(), } ``` After: ```rust // Option 1: Ray3d { origin: Vec3::ZERO, direction: Direction3d::new(Vec3::new(0.5, 0.6, 0.2)).unwrap(), } // Option 2: Ray3d::new(Vec3::ZERO, Vec3::new(0.5, 0.6, 0.2)) ``` ### Plane intersections Before: ```rust let result = ray.intersect_plane(Vec2::X, Vec2::Y); ``` After: ```rust let result = ray.intersect_plane(Vec2::X, Plane2d::new(Vec2::Y)); ```
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Objective
Add 2D and 3D geometric primitives for rays as defined in the Primitive Shapes RFC, continuing the work on #10572.
Solution
Add
Ray2dandRay3d, defined like this:They are mostly a copy of the existing
Raystruct, but I decided not to addintersect_planebecause ray intersections are out of scope for this PR and the method would be better handled by a general raycasting trait that is implemented for each shape separately.Questions
Should the old
Raybe removed already? It could be replaced byRay3d, but it would be a breaking change asintersect_planewouldn't exist anymore (for now). I could also just addintersect_planeif people find it to be important to have.