public void Test_Surface()
{
TestContext.WriteLine($"Testing: {nameof(Test_Surface)}");
var p = Plane.WorldXY;
var srf = new PlaneSurface(p, new Interval(0, 1), new Interval(0, 2)).ToBrep().Surfaces.First();
var face3D = srf.ToHBFace3D();
var boudary = face3D.Boundary;
Assert.AreEqual(boudary[2], new List <decimal> {
1, 2, 0
});
}