public void AddTriangle(double x1, double y1, double z1, double x2, double y2, double z2, double x3, double y3, double z3) { AddPolygon(new Point3D[] { new Point3D { X = x1, Y = y1, Z = z1 }, new Point3D { X = x2, Y = y2, Z = z2 }, new Point3D { X = x3, Y = y3, Z = z3 } }); }