/**
 * ParticleAffectors.ts
 *
 * Reusable affector functions that modify particles each frame.
 * Plug these into ParticleSystem.addAffector().
 */
import type { Particle } from './ParticleSystem';
/**
 * Gravity: Constant downward acceleration.
 */
export declare function gravity(strength?: number): (p: Particle, delta: number) => void;
/**
 * Wind: Constant force in a direction.
 */
export declare function wind(x: number, y: number, z: number): (p: Particle, delta: number) => void;
/**
 * Turbulence: Random velocity perturbation based on pseudo-noise.
 */
export declare function turbulence(strength?: number): (p: Particle, delta: number) => void;
/**
 * Drag: Velocity damping (air resistance).
 */
export declare function drag(coefficient?: number): (p: Particle, delta: number) => void;
/**
 * Attractor: Pull particles toward a point.
 */
export declare function attractor(x: number, y: number, z: number, strength?: number, minDist?: number): (p: Particle, delta: number) => void;
/**
 * Vortex: Spin particles around an axis.
 */
export declare function vortex(axisX: number, axisY: number, axisZ: number, strength?: number): (p: Particle, delta: number) => void;
/**
 * Floor bounce: Bounce particles off a horizontal plane.
 */
export declare function floorBounce(floorY?: number, bounciness?: number): (p: Particle, delta: number) => void;
/**
 * Size oscillation: Pulse size over lifetime.
 */
export declare function sizeOscillate(frequency?: number, amplitude?: number): (p: Particle, delta: number) => void;
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