import type { ColorValue, WebGLRenderer } from '../../core';
import type { EffectProperties, Node } from '../main';
import { Color } from '../../core';
import { Viewport } from '../main';
import { Effect } from '../main/Effect';
import { Material } from '../resources';
import { GaussianBlurEffect } from './GaussianBlurEffect';
export interface DropShadowEffectProperties extends EffectProperties {
    color: ColorValue;
    blur: number;
    offsetX: number;
    offsetY: number;
    shadowOnly: boolean;
}
export declare class DropShadowEffect extends Effect {
    static material: Material;
    color: ColorValue;
    blur: number;
    offsetX: number;
    offsetY: number;
    shadowOnly: boolean;
    blurEffect: GaussianBlurEffect;
    viewport3: Viewport;
    protected _color: Color;
    constructor(properties?: Partial<DropShadowEffectProperties>, children?: Node[]);
    apply(renderer: WebGLRenderer, source: Viewport): void;
}