cross function
Computes the cross product of two vec3's
@param {vec3} out the receiving vector @param {ReadonlyVec3} a the first operand @param {ReadonlyVec3} b the second operand @returns {vec3} out
Implementation
List<double> cross(List<double> out, List<double> a, List<double> b) {
final ax = a[0], ay = a[1], az = a[2];
final 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;
}