public void LineRotationTest()
{
Matrix3d r = Matrix3d.RotationMatrix(new Vector3d(1, 1, 1), 2 * PI / 3);
Coord3d coord = new Coord3d(new Point3d(3, 2, 1), r);
Point3d p = new Point3d(5, 0, 2, coord);
Line3d l = new Line3d(new Point3d(4, 1, 2), new Vector3d(1, 2, 6));
Assert.IsTrue(l.Rotate(r, p).Rotate(r, p).Rotate(r, p) == l);
Rotation q = new Rotation(new Vector3d(1, 1, 1), 2 * PI / 3);
Assert.IsTrue(l.Rotate(q, p).Rotate(q, p).Rotate(q, p) == l);
}
