Quadratic cells and vtkCutter
This issue was created automatically from an original Mantis Issue. Further discussion may take place here.
However, if I use a cutter plane with the quadratic cells, I get no output from vtkCutter::UnstructuredGridCutter() – linear cells are OK.
When the higher order cells are subdivided using vtkQuadraticHexahedron::Subdivide() (for example), the input point data contains the original point scalars and vectors of the unstructured grid but not the implicit function values. Consequently, no linear cells are ever found for contouring (in this particular case the original point scalars are the point id’s).
The implicit function scalars are passed into vtkQuadraticHexahedron::Contour() as ‘cellScalars’ but are not used. Some how, these
scalars need to be used by Subdivide() but presumably the original scalars must also be preserved.
Maybe I have got this completely wrong but any help is greatly appreciated.