import type { OrthographicCamera, Texture } from "three";
import { Box3, DirectionalLight, PerspectiveCamera } from "three";
/**
 * Directional light with spherical positioning and HDR environment support.
 */
export declare class Sun extends DirectionalLight {
    private readonly tempVector3D0;
    private readonly tempVector3D1;
    private readonly tempVector3D2;
    private readonly tempVector3D3;
    private readonly tempVector3D4;
    private readonly tempVector3D5;
    private readonly tempVector3D6;
    private readonly tempVector3D7;
    private readonly tempBox3;
    private readonly tempSpherical;
    get distance(): number;
    /** Spherical phi. */
    get elevation(): number;
    /** Spherical theta. */
    get azimuth(): number;
    set distance(value: number);
    /** @param value - Spherical phi in radians. */
    set elevation(value: number);
    /** @param value - Spherical theta in radians. */
    set azimuth(value: number);
    /**
     * @param elevation - Spherical phi in radians.
     * @param azimuth - Spherical theta in radians.
     */
    setPosition(elevation: number, azimuth: number, distance?: number): void;
    configureShadowsForBoundingBox(box3: Box3): void;
    /** Supports both perspective and orthographic scene cameras. */
    configureShadowsForCamera(sceneCamera: PerspectiveCamera | OrthographicCamera): void;
    /**
     * Sets direction, color, and intensity in a single call.
     *
     * @param texture - Must have image data.
     * @param intensityScale - Multiplied by pixel luminance.
     */
    setFromHDRTexture(texture: Texture, intensityScale?: number, distance?: number): void;
    /** @param texture - Must have image data. */
    setColorFromHDRTexture(texture: Texture): void;
    /**
     * Intensity equals the luminance of the brightest pixel.
     *
     * @param texture - Must have image data.
     */
    setIntensityFromHDRTexture(texture: Texture, scale?: number): void;
    /** @param texture - Must have image data. */
    setDirectionFromHDRTexture(texture: Texture, distance?: number): void;
    private findBrightestPixel;
    /** Stores world-space frustum corners in `tempVector3D0`-`tempVector3D7`. */
    private computeFrustumPoints;
    /** Stores world-space frustum corners in `tempVector3D0`-`tempVector3D7`. */
    private computeOrthographicPoints;
}