gl-vec3/cross.js

gl-matrix's vec3, split into smaller pieces

module.exports = cross;

/**
 * Computes the cross product of two vec3's
 *
 * @param {vec3} out the receiving vector
 * @param {vec3} a the first operand
 * @param {vec3} b the second operand
 * @returns {vec3} out
 */
function cross(out, a, b) {
    var ax = a[0], ay = a[1], az = a[2],
        bx = b[0], by = b[1], bz = b[2]

    out[0] = ay * bz - az * by
    out[1] = az * bx - ax * bz
    out[2] = ax * by - ay * bx
    return out
}