Enum CollisionMode 

pub enum CollisionMode {
    None,
    Kill,
    Bounce {
        restitution: f32,
    },
}

How particles react to solid voxels (PS.3) — checked only by the _with_scene update/tick variants; the scene-free ones never collide. The test is a point sample of the post-step position, nudged half a voxel along the velocity (Scene::resolve_voxel’s picking nudge, reused): contact registers slightly before visual interpenetration, fast particles can tunnel through walls thinner than one step’s travel, and a resting particle (zero velocity) is never re-tested — all acceptable for effects, none of this is a physics engine.

Variants

None

No voxel interaction (default) — particles pass through.

Kill

Die on contact (impact sparks, raindrops).

Bounce

Reflect off the surface: velocity flips on the axes whose voxel boundary was crossed this step (the cheapest normal estimate — exact for axis-aligned grids, approximate for rotated ones), then the whole velocity scales by restitution — tangential damping included, deliberately arcade.

Fields

restitution: f32

Energy kept per bounce, 0..=1 (0.5 = half).

Trait Implementations

impl Clone for CollisionMode

fn clone(&self) -> CollisionMode

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for CollisionMode

impl Debug for CollisionMode

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for CollisionMode

fn default() -> CollisionMode

Returns the “default value” for a type.

impl PartialEq for CollisionMode

fn eq(&self, other: &CollisionMode) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for CollisionMode