import * as THREE from 'three';
import type { RingVariation } from './ringVariation';
/**
 * Patches a planet's ShaderMaterial with ring-cast-on-planet shadowing.
 *
 * The shader ray-casts from each fragment toward the sun and, if the ray
 * crosses the ring plane inside [innerR, outerR], samples the same profile
 * used by {@link BodyRings} to attenuate the surface lighting.
 *
 * This follows the same "prepend uniforms + inject before main's closing brace"
 * pattern as {@link injectPlanetShadows} so both injections compose cleanly.
 *
 * @param mat  - Planet ShaderMaterial (must be patched BEFORE first render).
 * @param ring - The ring variation driving the shadow pattern.
 * @param opts - Optional overrides. `sunPosRef` lets preview scenes point the
 *               shader at a light source other than the world origin.
 */
export declare function injectRingShadow(mat: THREE.ShaderMaterial, ring: RingVariation, opts?: {
    /** Shared `{ value }` reference for the sun world position. Defaults to origin. */
    sunPosRef?: {
        value: THREE.Vector3;
    };
    /** Planet visual radius — used to resolve ring inner/outer world radii. */
    planetRadius: number;
}): void;
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