Hello,

I am just getting started with OpenMesh and learning the halfedge structure. I am trying to split a face and then split it again to ultimately create areas of different densities that looks something similar to the picture below. 

I have tried to use the following code:
int main()
{
  MyMesh mesh;
  // generate vertices
  MyMesh::VertexHandle vhandle[5];
  vhandle[0] = mesh.add_vertex(MyMesh::Point(0, 0,  0));
  vhandle[1] = mesh.add_vertex(MyMesh::Point( 0, 10,  0));
  vhandle[2] = mesh.add_vertex(MyMesh::Point( 10,  10,  0));
  vhandle[3] = mesh.add_vertex(MyMesh::Point(10,  0,  0));
  vhandle[4] = mesh.add_vertex(MyMesh::Point(5,5,0));

  mesh.add_face(vhandle[2], vhandle[1], vhandle [0]);
  mesh.add_face(vhandle[2], vhandle[0], vhandle [3]);

  mesh.split(mesh.face_handle(0), vhandle[4]);
  mesh.split(mesh.face_handle(1), vhandle[4]);

// This face_handle is generated from the previous split
// and is the one causing errors
mesh.split(mesh.face_handle(2), vhandle[1]);
However when I try to load the output.off file into a mesh viewer I get the error, "warning mesh contains 0 vertices with NAN coordinates and two degenerated faces". Do you have any recommendations on how to create a mesh with a large amount of faces? I am relatively new to c++ as well as mesh generating so I feel like I'm taking the most difficult approach to this.

Thank you in advance for your help and I apologize if something like this has been answered in the documentation but I could not find it.

- William