angle method

double angle(
  1. V3 o
)

Implementation

double angle(V3 o) {
  final cross = _v3(
    y*o.z - z*o.y,
    z*o.x - x*o.z,
    x*o.y - y*o.x
  );
  return math.atan2(cross.length, dotProduct(o));
}