public void CreateExtrudeMesh(Model model1)
{
Shapes shapes = new Shapes();
CompositeCurve roundRect = shapes.RoundRectangle();
Mesh mesh = roundRect.ExtrudeAsMesh(new Vector3D(0, 0, 50), 0.001, Mesh.natureType.Plain);
mesh.Color = Color.Aquamarine;
mesh.ColorMethod = colorMethodType.byEntity;
model1.Entities.Add(mesh);
model1.Invalidate();
}