import Light, { LightOpts } from '../Light';
export interface DirectionalLightOpts extends LightOpts {
    shadowBias: number;
    shadowSlopeScale: number;
    /**
     * Shadow cascade.
     * Use PSSM technique when it is larger than 1 and have a unique directional light in scene.
     */
    shadowCascade: number;
    /**
     * Available when shadowCascade is larger than 1 and have a unique directional light in scene.
     */
    cascadeSplitLogFactor: number;
}
/**
 * @example
 *     const light = new clay.light.Directional({
 *         intensity: 0.5,
 *         color: [1.0, 0.0, 0.0]
 *     });
 *     light.position.set(10, 10, 10);
 *     light.lookAt(clay.Vector3.ZERO);
 *     scene.add(light);
 */
declare class DirectionalLight extends Light {
    shadowBias: number;
    shadowSlopeScale: number;
    shadowCascade: number;
    cascadeSplitLogFactor: number;
    readonly type = "DIRECTIONAL_LIGHT";
    constructor(opts?: Partial<DirectionalLightOpts>);
    clone(): DirectionalLight;
}
export default DirectionalLight;