[vtkusers] Critical bug in vtkDepthSortPolyData in VTK7

[Pavel Krebs/AMBERG]

Hi all,
during moving from vtk 6.2 to vtk 7 (with enabled OpenGL2 backend 
rendering) we found serious bug in vtkDepthSortPolyData filter. There is a 
problem with generating of output vtkPolyData object. There are usage of 
wrong sizes for vtkCellArray for Vert, Lines, Polys,... Instead of real 
size the allocated size is used. Later in the rendering request 
uninitialised cell ids are used and rendering can crash.
I changed the code like this and it works now. Should be good to fix it 
also in VTK7 source code repository.

int vtkDepthSortPolyData::RequestData(
    vtkInformation *vtkNotUsed(request),
    vtkInformationVector **inputVector,
    vtkInformationVector *outputVector)
{
.
.
.
    vtkIdType *pOutputPolys = NULL;
    if (nPolys)
    {
        vtkCellArray *outputPolyCells = vtkCellArray::New();
        outputPolyCells->SetNumberOfCells(nPolys);
        output->SetPolys(outputPolyCells);
        outputPolyCells->Delete();
        vtkIdTypeArray *outputPolys = outputPolyCells->GetData();
-        outputPolys->SetNumberOfTuples(input->GetPolys()->GetSize());
+ 
outputPolys->SetNumberOfTuples(input->GetPolys()->GetNumberOfConnectivityEntries());
        pOutputPolys = outputPolys->GetPointer(0);
    }
.
.
.
}

Kind regards
 
Pavel Krebs
Software Engineer

AMBERG Engineering Brno, a.s.
Ptašínského 10
602 00 Brno - Czech Republic

Phone: +420 541 432 662
E-Mail: pkrebs at amberg.cz
www.amberg.ch/at

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