bevy/crates/bevy_math
NiseVoid 01b9ddd92c
Define a basic set of Primitives (#10466)
# 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>
2023-11-15 16:51:03 +00:00
..
src Define a basic set of Primitives (#10466) 2023-11-15 16:51:03 +00:00
Cargo.toml Release 0.12 (#10362) 2023-11-04 17:24:23 +00:00