C++
Acad::ErrorStatus makeMOpen();
Description
This function sets the PolygonMesh to be open in the M direction. This means that the mesh will be discontinuous between the last row and the first row.
Making the PolygonMesh open in the M direction clears bit 1 of DXF group code 70.
Returns Acad::eOk if successful or Acad::eInvalidInput if the data passed in is not acceptable.