// returns first two boundary edges, and count of total boundary edges
public int vertex_boundary_edges(int vID, ref int e0, ref int e1)
{
int count = 0;
foreach (int eid in Mesh.VtxEdgesItr(vID))
{
if (edge_is_boundary(eid))
{
if (count == 0)
{
e0 = eid;
}
else if (count == 1)
{
e1 = eid;
}
count++;
}
}
return(count);
}