A 2D ray, for planar/cross-section geometry (top-down gameplay logic, sightlines, or a
horizontal/vertical slice through a 3D scene -- e.g. tracing a light ray through a prism's
triangular cross-section, as apps/showcases/28 does). For raycasting against full 3D scene
geometry, see src/physix/Ray.ts instead.
A 2D ray, for planar/cross-section geometry (top-down gameplay logic, sightlines, or a horizontal/vertical slice through a 3D scene -- e.g. tracing a light ray through a prism's triangular cross-section, as
apps/showcases/28does). For raycasting against full 3D scene geometry, seesrc/physix/Ray.tsinstead.