[vtk-developers] vtkExtractSelectedIds (v5.10) performance of selection including containing cells

[Andreas Buykx]

Hi all,

I have a performance problem when I use vtkExtractSelectedIds with including the containing cells. I was studying the code and found a strange for-loop in the block below (vtkExtractSelectedIds.cxx v5.10, line 870). The loop variable j is used both in the 1st for-loop and in the 3rd for-loop. The first for-loop's j value is never used, but it gets reset to a low value every time the if-statement above the 3rd for-loop is true.  I suspect this is not intended.

      if (containingCells)
        {
        for (vtkIdType j = 0; j < input->GetNumberOfPoints(); j++)
          {
          input->GetPointCells(ptId, ptCells);
          for (i = 0; i < ptCells->GetNumberOfIds(); ++i)
            {
            cellId = ptCells->GetId(i);
            if (!passThrough && !invert && cellInArray->GetValue(cellId) != flag)
              {
              input->GetCellPoints(cellId, cellPts);
              for (j = 0; j < cellPts->GetNumberOfIds(); ++j)
                {
                pointInArray->SetValue(cellPts->GetId(j), flag);
                }
              }
            cellInArray->SetValue(cellId, flag);
            }
          }
        }

Andreas Buykx
Senior Software Engineer

TNO DIANA BV
Software Developers and Analysis Consultants for Civil and Geotechnical Engineering

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