private static void SaveMesh(Mesh mesh, string filename)
{
System.IO.File.Delete(filename);
using (StreamWriter sw = File.AppendText(filename))
{
STL.AppendMeshToSTL(mesh, sw);
Vector3D aStart = H3Ruled.Transform(new Vector3D(0, 0, -1));
Vector3D aEnd = H3Ruled.Transform(new Vector3D(0, 0, 1));
Mesh m3 = new Mesh();
AddEdge(m3, aStart, aEnd);
//STL.AppendMeshToSTL( m3, sw );
}
}