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PbdDistanceConstraint

oxiphysics_core

Struct PbdDistanceConstraint 

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pub struct PbdDistanceConstraint {
    pub indices: [usize; 2],
    pub rest_length: Real,
    pub k: Real,
}
Expand description

A simple PBD distance constraint between two particles.

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§indices: [usize; 2]

Indices of the two particles.

§rest_length: Real

Rest (target) distance.

§k: Real

Stiffness in [0, 1].

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impl PbdDistanceConstraint

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pub fn new(i: usize, j: usize, rest_length: Real, stiffness: Real) -> Self

Create a new distance constraint.

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impl PbdConstraint for PbdDistanceConstraint

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fn evaluate(&self, positions: &[[Real; 3]]) -> Real

Evaluate constraint C(p) — returns violation (0 = satisfied).
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fn gradient(&self, positions: &[[Real; 3]]) -> Vec<[Real; 3]>

Compute constraint gradient ∇C with respect to each particle position.
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fn particle_indices(&self) -> &[usize]

Particle indices involved in this constraint.
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fn stiffness(&self) -> Real

Stiffness in range [0, 1] (1 = fully rigid, 0 = no correction).

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type Output = T

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