import { AttributeData, AttributeArray } from './types';
/**
 * Decode oct-encoded normals
 * @param attrData - The attribute data with oct-encoded normals
 * @returns Decoded Float32Array with xyz normals or original array
 */
export declare function decodeOctEncodedNormals(attrData: AttributeData): Float32Array | AttributeArray;
/**
 * Compute vertex normals from position and index data
 * @param posArray - Position array (xyz per vertex)
 * @param indexArray - Index array (optional, null for non-indexed geometry)
 * @returns Computed normals as Float32Array
 */
export declare function computeVertexNormals(posArray: Float32Array, indexArray: Uint16Array | Uint32Array | null): Float32Array;
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