import * as THREE from 'three';
import * as React from 'react';
import { ReactThreeFiber, ThreeElements } from '@react-three/fiber';
import { ForwardRefComponent } from '../helpers/ts-utils';
export type CausticsProps = Omit<ThreeElements['group'], 'ref'> & {
    frames?: number;
    debug?: boolean;
    causticsOnly: boolean;
    backside: boolean;
    ior?: number;
    backsideIOR?: number;
    worldRadius?: number;
    intensity?: number;
    color?: ReactThreeFiber.Color;
    resolution?: number;
    lightSource?: [x: number, y: number, z: number] | React.RefObject<THREE.Object3D>;
};
declare module '@react-three/fiber' {
    interface ThreeElements {
        causticsProjectionMaterial: ThreeElements['meshNormalMaterial'] & {
            viewMatrix?: {
                value: THREE.Matrix4;
            };
            color?: ReactThreeFiber.Color;
            causticsTexture?: THREE.Texture;
            causticsTextureB?: THREE.Texture;
            lightProjMatrix?: THREE.Matrix4;
            lightViewMatrix?: THREE.Matrix4;
        };
    }
}
export declare const Caustics: ForwardRefComponent<CausticsProps, THREE.Group>;