/**
 * Compute signed volume of a tetrahedron with the last point at the origin
 * Triangle is defined by points A,B,C
 * @see "EFFICIENT FEATURE EXTRACTION FOR 2D/3D OBJECTS IN MESH REPRESENTATION" by Cha Zhang and Tsuhan Chen
 * @param {number} ax
 * @param {number} ay
 * @param {number} az
 * @param {number} bx
 * @param {number} by
 * @param {number} bz
 * @param {number} cx
 * @param {number} cy
 * @param {number} cz
 * @return {number}
 */
export function triangle_compute_signed_volume(ax: number, ay: number, az: number, bx: number, by: number, bz: number, cx: number, cy: number, cz: number): number;
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