import * as THREE from 'three/webgpu';
import type { TSLFloatInput, TSLFloatNode, TSLFunction, TSLMat4Input, TSLTextureNode, TSLVec3Input, TSLVec3Node } from '../types/tsl.cjs';
export interface VolumeSmokeShadowOptions {
    /** Existing light optical-depth cache. The helper borrows the texture. */
    opticalDepthTexture: THREE.Texture | TSLTextureNode;
    /** Matrix transforming world positions into the volume's centered [-.5, .5] domain. */
    worldToDomain: TSLMat4Input;
    /** Direction from the shaded point toward the light, expressed in local domain space. */
    lightDirLocal: TSLVec3Input;
    /** Optical-depth multiplier. Zero is neutral. */
    strength?: TSLFloatInput | undefined;
}
export type VolumeSmokeShadowNode = TSLFunction<[
    worldPosition: TSLVec3Node
], TSLFloatNode>;
/**
 * Samples a smoke volume's existing directional optical-depth cache as a scene shadow.
 * Rays that miss the domain return one; rays that hit sample the light-facing entry point.
 *
 * @category TSL
 */
export declare function volumeSmokeShadow({ opticalDepthTexture, worldToDomain, lightDirLocal, strength, }: VolumeSmokeShadowOptions): VolumeSmokeShadowNode;