public void IsParallelToTest()
{
Vector3d v = new Vector3d(1, 0, 0);
Line3d l = new Line3d(new Point3d(), v);
Ray3d r = new Ray3d(new Point3d(), v.OrthogonalVector);
Circle3d c = new Circle3d(new Point3d(), 5, v);
Assert.IsTrue(v.IsParallelTo(l));
Assert.IsTrue(l.IsNotParallelTo(r));
Assert.IsTrue(r.IsOrthogonalTo(v));
Assert.IsTrue(c.IsOrthogonalTo(l));
Assert.IsTrue(r.IsParallelTo(c));
Assert.IsTrue(c.IsParallelTo(Coord3d.GlobalCS.YZ_plane));
Assert.IsTrue(c.IsOrthogonalTo(Coord3d.GlobalCS.XZ_plane));
Assert.IsTrue(Coord3d.GlobalCS.YZ_plane.IsOrthogonalTo(v));
}