// Returns the angle from this vector to b, in radians.
public float Angle(Vector3f b)
{
float div = LengthSq() * b.LengthSq();
Debug.Assert(div != 0);
return (float)(System.Math.Acos((this.Dot(b)) / System.Math.Sqrt(div)));
}
// Projects this vector onto the argument; in other words,
// A.Project(B) returns projection of vector A onto B.
public Vector3f ProjectTo(Vector3f b)
{
float l2 = b.LengthSq();
Debug.Assert(l2 != 0);
return b * (Dot(b) / l2);
}
