Struct Muscle 

pub struct Muscle {
    pub name: String,
    pub joint_name: String,
    pub max_flex_angle: f32,
    pub bulge_amplitude: f32,
    pub influences: Vec<(u32, f32)>,
    pub bulge_direction: BulgeDirection,
}

A muscle definition: a named region that bulges when a joint flexes

Fields

name: String

joint_name: String

Which joint drives this muscle

max_flex_angle: f32

Flex angle that produces maximum bulge (radians, e.g., PI/2)

bulge_amplitude: f32

Peak bulge amplitude (world units)

influences: Vec<(u32, f32)>

Vertex influences: (vertex_index, weight 0..1)

bulge_direction: BulgeDirection

Direction of bulge per influenced vertex (outward normal override)

Implementations

impl Muscle

pub fn new(name: impl Into<String>, joint_name: impl Into<String>) -> Self

pub fn with_influences(self, influences: Vec<(u32, f32)>) -> Self

pub fn with_amplitude(self, amp: f32) -> Self

pub fn with_max_flex(self, angle: f32) -> Self

pub fn bulge_weight(&self, joint_angle: f32) -> f32

Compute bulge weight [0,1] from joint angle using smoothstep

pub fn compute_displacements( &self, joint_angle: f32, positions: &[[f32; 3]], normals: &[[f32; 3]], ) -> Vec<(u32, [f32; 3])>

Compute per-vertex displacements for a given joint angle and mesh normals