import * as THREE from 'three';
/**
 * Screen-space God Rays (Crytek radial blur method).
 *
 * Seeds rays exclusively from a dedicated mask texture (`tMask`) that
 * contains ONLY the star — rendered via a layer isolation pass. This prevents
 * bright non-stellar pixels (gas planets, surface highlights, lens flare glows)
 * near the sun UV from polluting the ray accumulation.
 *
 * Variable ray lengths: angular noise (overlapping sine harmonics) modulates
 * the weight per direction — some angles produce long bright rays, others
 * nearly nothing, giving an organic star-burst pattern.
 *
 * Pass order: RenderPass → GodRaysShaderPass → UnrealBloomPass → OutputPass
 * Rays are bloomed by UnrealBloomPass, giving them a soft organic glow.
 */
export declare const GodRaysShader: {
    name: string;
    uniforms: {
        tDiffuse: {
            value: THREE.Texture | null;
        };
        /** Star-only render (black everywhere else). Seeds all ray contributions. */
        tMask: {
            value: THREE.Texture | null;
        };
        /** Sun position in UV space [0,1]. Updated every frame from camera projection. */
        uSunUV: {
            value: THREE.Vector2;
        };
        /** Overall brightness of rays */
        uExposure: {
            value: number;
        };
        /** Attenuation per sample step (closer to 1 = longer rays) */
        uDecay: {
            value: number;
        };
        /** Step stretch factor */
        uDensity: {
            value: number;
        };
        /** Per-sample weight before angular modulation */
        uWeight: {
            value: number;
        };
        /** 0–1 fade: 0 when sun is off-screen or behind camera */
        uEnabled: {
            value: number;
        };
    };
    vertexShader: string;
    fragmentShader: string;
};
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