/**
 * ParticleForces.ts
 *
 * Force field system for particles: gravity, wind, turbulence,
 * point attractors, vortex fields, and drag.
 *
 * @module particles
 */
import type { Particle, IVector3 } from './ParticleEmitter';
export type ForceType = 'gravity' | 'wind' | 'turbulence' | 'attractor' | 'vortex' | 'drag';
export interface ForceFieldConfig {
    id: string;
    type: ForceType;
    strength: number;
    position?: IVector3;
    direction?: IVector3;
    radius?: number;
    falloff?: 'linear' | 'quadratic' | 'none';
    frequency?: number;
    dragCoefficient?: number;
}
export interface ForceField {
    config: ForceFieldConfig;
    enabled: boolean;
}
export declare class ParticleForceSystem {
    private fields;
    private time;
    addForce(config: ForceFieldConfig): void;
    removeForce(id: string): void;
    setEnabled(id: string, enabled: boolean): void;
    getForce(id: string): ForceField | undefined;
    getForceCount(): number;
    /**
     * Apply all force fields to a set of particles.
     */
    apply(particles: Particle[], dt: number): void;
    private applyForce;
    private applyGravity;
    private applyWind;
    private applyTurbulence;
    private applyAttractor;
    private applyVortex;
    private applyDrag;
    private getPositionalFalloff;
}
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