/**
 * Generates a seamless, tileable 3D noise volume (improved Perlin) with exact wrap.
 * - Perfectly tiles along X, Y, Z with `frequency` cycles across each axis.
 * - Output is Uint8Array of size^3, values in [0,255].
 */
export declare function generateSeamless3DNoise(size: number, frequency: number, seed?: number): Uint8Array;
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