/**
 * ParticleCollision.ts
 *
 * Particle collision: plane/sphere bounce, friction,
 * lifetime reduction on impact, and sub-emitter spawning.
 *
 * @module particles
 */
export interface CollisionPlane {
    id: string;
    nx: number;
    ny: number;
    nz: number;
    d: number;
    bounce: number;
    friction: number;
    lifetimeLoss: number;
}
export interface CollisionSphere {
    id: string;
    cx: number;
    cy: number;
    cz: number;
    radius: number;
    bounce: number;
    friction: number;
}
export interface CollidableParticle {
    x: number;
    y: number;
    z: number;
    vx: number;
    vy: number;
    vz: number;
    lifetime: number;
    alive: boolean;
    [index: number]: number | boolean;
}
export type SubEmitCallback = (x: number, y: number, z: number, count: number) => void;
export declare class ParticleCollisionSystem {
    private syncParticleCompat;
    private planes;
    private spheres;
    private subEmitCallback;
    private subEmitCount;
    private collisionCount;
    addPlane(plane: CollisionPlane): void;
    addSphere(sphere: CollisionSphere): void;
    onSubEmit(callback: SubEmitCallback, count?: number): void;
    resolve(particles: CollidableParticle[]): void;
    getCollisionCount(): number;
}
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