public void TestWeights()
{
//check endpoints
Assert.AreEqual(Vector4.UnitY, CatmullRomSpline.GetWeights(0));
Assert.AreEqual(Vector4.UnitZ, CatmullRomSpline.GetWeights(1));
//check symmetry
Vector4 w1 = CatmullRomSpline.GetWeights(1 / 4f);
Vector4 w3 = CatmullRomSpline.GetWeights(3 / 4f);
Assert.AreEqual(w1.X, w3.W, 1e-4);
Assert.AreEqual(w1.Y, w3.Z, 1e-4);
Assert.AreEqual(w1.Z, w3.Y, 1e-4);
Assert.AreEqual(w1.W, w3.X, 1e-4);
}