vtkPolyDataNormals doesn't pass lines through...
This issue was created automatically from an original Mantis Issue. Further discussion may take place here.
When a polydata has no triangles at the input of a vtkPolyDataNormals, the filter returns early with no output... it would be nice if it passed any lines or verts through before returning. Maybe:
RCS file: /cvsroot/VTK/VTK/Graphics/vtkPolyDataNormals.cxx,v retrieving revision 1.63 diff -r1.63 vtkPolyDataNormals.cxx 84,85c84 < if ( (numPts=input->GetNumberOfPoints()) < 1 || < (numPolys < 1 && numStrips < 1) )
> if ( (numPts=input->GetNumberOfPoints()) < 1) 93c92,93 < if ( this->ComputePointNormals == 0 && this->ComputeCellNormals == 0)
> if ( this->ComputePointNormals == 0 && this->ComputeCellNormals == 0 || > (numPolys < 1 && numStrips < 1))