public void TransformRotationX()
{
facet.Vx1 = Vector3.Zero;
facet.Vx2 = Vector3.UnitX;
facet.Vx3 = Vector3.UnitY;
facet.Normal = Vector3.UnitZ;
Matrix3 matrix = Matrix3.CreateRotationX((float)(90 * Math.PI / 180));
facet.Transform(matrix);
Assert.AreEqual(Vector3.Zero, facet.Vx1);
Assert.AreEqual(Vector3.UnitX, facet.Vx2);
Assert.IsTrue(Vector3.Distance(Vector3.UnitZ, facet.Vx3) < 1e-5);
Assert.IsTrue(Vector3.Distance(new Vector3(0f, -1f, 0f), facet.Normal) < 1e-5);
}