Struct DistanceConstraint 

pub struct DistanceConstraint {
    pub rest_length: f32,
    pub stiffness: f32,
    pub damping: f32,
    pub allow_compression: bool,
    pub allow_extension: bool,
}

Maintains a target distance between two points, with spring-based correction.

Used to connect two particles or bones with a stiff but springy constraint.

Fields

rest_length: f32

Rest distance between point A and point B.

stiffness: f32

How stiff the constraint is (0 = free, 1 = rigid solve).

damping: f32

Damping ratio applied to constraint correction impulses.

allow_compression: bool

Whether to allow compression (shorter than rest_length).

allow_extension: bool

Whether to allow extension (longer than rest_length).

Implementations

impl DistanceConstraint

pub fn new(rest_length: f32, stiffness: f32) -> Self

pub fn rod(rest_length: f32) -> Self

Rod — rigid, both directions.

pub fn rope(rest_length: f32) -> Self

Rope — only resists extension (allows slack).

pub fn strut(rest_length: f32) -> Self

Strut — only resists compression (allows stretching).

pub fn solve( &self, pa: Vec3, pb: Vec3, mass_a: f32, mass_b: f32, ) -> (Vec3, Vec3)

Compute position corrections to apply to points A and B.

pa, pb — current positions. mass_a, mass_b — masses (constraint splits correction by mass ratio). Returns (delta_a, delta_b) — offsets to add to each point position.

Trait Implementations

impl Clone for DistanceConstraint

fn clone(&self) -> DistanceConstraint

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for DistanceConstraint

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

Formats the value using the given formatter.