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# Objective - Implement a subset of https://github.com/bevyengine/rfcs/blob/main/rfcs/12-primitive-shapes.md#feature-name-primitive-shapes ## Solution - Define a very basic set of primitives in bevy_math - Assume a 0,0,0 origin for most shapes - Use radius and half extents to avoid unnecessary computational overhead wherever they get used - Provide both Boxed and const generics variants for shapes with variable sizes - Boxed is useful if a 3rd party crate wants to use something like enum-dispatch for all supported primitives - Const generics is useful when just working on a single primitive, as it causes no allocs #### Some discrepancies from the RFC: - Box was changed to Cuboid, because Box is already used for an alloc type - Skipped Cone because it's unclear where the origin should be for different uses - Skipped Wedge because it's too niche for an initial PR (we also don't implement Torus, Pyramid or a Death Star (there's an SDF for that!)) - Skipped Frustum because while it would be a useful math type, it's not really a common primitive - Skipped Triangle3d and Quad3d because those are just rotated 2D shapes ## Future steps - Add more primitives - Add helper methods to make primitives easier to construct (especially when half extents are involved) - Add methods to calculate AABBs for primitives (useful for physics, BVH construction, for the mesh AABBs, etc) - Add wrappers for common and cheap operations, like extruding 2D shapes and translating them - Use the primitives to generate meshes - Provide signed distance functions and gradients for primitives (maybe) --- ## Changelog - Added a collection of primitives to the bevy_math crate --------- Co-authored-by: Joona Aalto <jondolf.dev@gmail.com> |
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