Quadratic Quad Cell as Face
This is an issue related to vtkUnstructuredGridGeometryFilter.
The faces of a 3D quadratic cells are represented by 2D quadratic elements.
Problem
The inserted/generated faces are not the best representations of a 3D quadratic cell. See the picture below.
Obviously, the face orientation is wrong but that's not all is it?
The test case is here: paraview_testcase_quad.tar
Face Issue
Maybe the cell type VTK_QUADRATIC_QUAD is not the best choice?