import { Engine } from "../Engine";
import { EffectMaterial } from "../material/EffectMaterial";
/**
 * Trail material.
 */
export declare class TrailMaterial extends EffectMaterial {
    /**
     * Create a trail material instance.
     * @param engine - Engine to which the material belongs
     */
    constructor(engine: Engine);
    /**
     * @inheritdoc
     */
    clone(): TrailMaterial;
}
