export interface Particle {
    position: [number, number, number];
    previousPosition: [number, number, number];
    velocity: [number, number, number];
    invMass: number;
}
export interface DistanceConstraint {
    p1: number;
    p2: number;
    restLength: number;
    stiffness: number;
}
export declare class SoftBodySolver {
    private particles;
    private constraints;
    private gravity;
    private substeps;
    constructor(particles: Particle[], constraints: DistanceConstraint[]);
    /**
     * Step the simulation using PBD.
     */
    step(dt: number): void;
    private predictPositions;
    private solveConstraints;
    private updateVelocities;
    getParticles(): Particle[];
    getConstraints(): DistanceConstraint[];
}
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