/**
 * Assume normalized input on +Z hemisphere.
 * Output is on [-1, 1].
 *
 * Uses hemi-octahedron for sphere approximation
 *
 * @see A Survey of Efficient Representations for Independent Unit Vectors (Journal of Computer Graphics Techniques Vol. 3, No. 2, 2014)
 * @param {number[]} output
 * @param {number} output_offset
 * @param {number} x
 * @param {number} y
 * @param {number} z
 */
export function encode_unit_to_hemioct(output: number[], output_offset: number, x: number, y: number, z: number): void;
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