import * as spec from '@galacean/effects-specification';
import { Vector3 } from '@galacean/effects-math/es/core/index';
export type ShapeGeneratorOptions = {
    total: number;
    index: number;
    burstIndex: number;
    burstCount: number;
};
export type ShapeParticle = {
    direction: Vector3;
    position: Vector3;
};
export interface Shape {
    generate(options: ShapeGeneratorOptions): ShapeParticle;
}
export type ShapeGenerator = Shape & {
    reverseDirection?: boolean;
    alignSpeedDirection?: boolean;
    upDirection?: Vector3;
};
export declare function createShape(shapeOptions?: spec.ParticleShape): Shape;