Enum EmitterShape 

pub enum EmitterShape {
    Point,
    Line {
        start: Vec3,
        end: Vec3,
        endpoints_only: bool,
    },
    Box {
        half_extents: Vec3,
        surface_only: bool,
    },
    Sphere {
        radius: f32,
        inner_radius: f32,
        hemisphere: bool,
    },
    Disc {
        radius: f32,
        inner_radius: f32,
        arc_degrees: f32,
    },
    Cone {
        angle_degrees: f32,
        height: f32,
        base_radius: f32,
    },
    Torus {
        major_radius: f32,
        minor_radius: f32,
    },
    MeshSurface {
        vertices: Vec<Vec3>,
        normals: Vec<Vec3>,
        area_weights: Vec<f32>,
        volume_fill: bool,
    },
}

The geometric shape from which particles are born.

Variants

Point

Single world-space point.

Line

Line segment from start to end; particles spawn at random positions along it.

Fields

start: Vec3

end: Vec3

endpoints_only: bool

If true, emit only from the two end points alternately.

Box

Rectangular box volume.

Fields

half_extents: Vec3

surface_only: bool

Spawn only on the surface of the box, not the interior.

Sphere

Sphere or hemisphere.

Fields

radius: f32

inner_radius: f32

hemisphere: bool

Disc

Circle / disc in the XZ plane.

Fields

radius: f32

inner_radius: f32

arc_degrees: f32

Cone

Cone opening along +Y.

Fields

angle_degrees: f32

height: f32

base_radius: f32

Torus

Torus (donut) in the XZ plane.

Fields

major_radius: f32

minor_radius: f32

MeshSurface

Triangle mesh surface — particles spawn at random barycentric coords on random triangles.

Fields

vertices: Vec<Vec3>

Flat list of triangle vertices, groups of 3.

normals: Vec<Vec3>

Per-vertex normals; must match vertices length.

area_weights: Vec<f32>

Cumulative area weights for importance sampling.

volume_fill: bool

Emit from inner volume using centroid + random offset.

Implementations

impl EmitterShape

pub fn sample(&self, rng: &mut u64) -> (Vec3, Vec3)

Sample a position and outward normal from this shape using a simple LCG state.

Trait Implementations

impl Clone for EmitterShape

fn clone(&self) -> EmitterShape

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for EmitterShape

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

Formats the value using the given formatter.