static void Test()
{
SceneDebug dbg = new SceneDebug();
dbg.BeginBranch(new Vector3(1, 1, 1));
dbg.BeginBranch(new Vector3(2, 2, 2));
dbg.BeginBranch(new Vector3(3, 3, 3));
dbg.EndBranch();
dbg.BeginBranch(new Vector3(4, 4, 4));
dbg.EndBranch();
string fname = $"A:\\img\\{FileName()}";
dbg.SaveToFile(fname + ".obj");
}