public void ToParentPosition() { var a = new SrtTransform(new Vector3F(1, 2, 7), new QuaternionF(1, 2, 3, 4).Normalized, new Vector3F(4, -5, 6)); var v = new Vector3F(7, 9, -12); var result1 = a.ToParentPosition(v); var result2 = a.ToMatrix44F().TransformPosition(v); Assert.IsTrue(Vector3F.AreNumericallyEqual(result1, result2)); }