/**
 * SkyRenderer.ts
 *
 * Procedural sky: gradient colors, star field, cloud layers,
 * sun/moon discs, and atmospheric scattering approximation.
 *
 * @module environment
 */
export interface SkyGradient {
    top: {
        r: number;
        g: number;
        b: number;
    };
    horizon: {
        r: number;
        g: number;
        b: number;
    };
    bottom: {
        r: number;
        g: number;
        b: number;
    };
}
export interface StarField {
    seed: number;
    density: number;
    brightness: number;
    twinkleSpeed: number;
}
export interface CloudLayer {
    id: string;
    altitude: number;
    coverage: number;
    speed: {
        x: number;
        z: number;
    };
    color: {
        r: number;
        g: number;
        b: number;
        a: number;
    };
    scale: number;
    offset: {
        x: number;
        z: number;
    } & Record<number, number>;
}
export interface CelestialBody {
    visible: boolean;
    angle: number;
    size: number;
    color: {
        r: number;
        g: number;
        b: number;
    };
    intensity: number;
}
export declare class SkyRenderer {
    private syncCloudCompat;
    private gradient;
    private stars;
    private clouds;
    private sun;
    private moon;
    private moonPhase;
    private starsVisible;
    setGradient(gradient: SkyGradient): void;
    getGradient(): SkyGradient;
    sampleGradient(t: number): {
        r: number;
        g: number;
        b: number;
    };
    private lerpColor;
    setStarField(config: Partial<StarField>): void;
    setStarsVisible(visible: boolean): void;
    areStarsVisible(): boolean;
    getStarField(): StarField;
    addCloudLayer(coverage: number, altitude?: number, speed?: {
        x: number;
        z: number;
    } | [number, number, number]): CloudLayer;
    removeCloudLayer(id: string): boolean;
    getCloudLayers(): CloudLayer[];
    getCloudCount(): number;
    updateClouds(dt: number): void;
    setSunAngle(angle: number): void;
    setMoonAngle(angle: number): void;
    setMoonPhase(phase: number): void;
    getMoonPhase(): number;
    getSun(): CelestialBody;
    getMoon(): CelestialBody;
    applyDaytime(): void;
    applySunset(): void;
    applyNight(): void;
    getTotalCoverage(): number;
}
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