[vtk-developers] vtkGeometryFilter bug

[Andreas Buykx]

Hi all,

vtkGeometryFilter corrupts cell data when it tries to convert vtkUnstructuredGrid to vtkPolyData. I wrote a small test program that builds an unstructured grid from
various cell types, assigns cell data and point data, and runs it through the vtkGeometryFilter. The resulting polydata does not have as many celldata tuples as it has cells.

Defining 8 points
Adding 2 tetra cells
Adding 2 triangle cells
Adding 2 line cells
Adding 2 vertex cells
Adding point data array 'foo' with data for 8 points
Adding cell data array 'bar' with data for 8 cells

vtkGeometryFilter input:
vtkUnstructuredGrid dimensions: #cells=8 #points=8
point data array 'foo' #tuples=8
cell data array 'bar' #tuples=8

vtkGeometryFilter output:
vtkPolyData dimensions: #cells=14 #points=8
point data array 'foo' #tuples=8
cell data array 'bar' #tuples=10

We very much need a reliable conversion from vtkUnstructuredGrid to vtkPolydata by a filter.
Is there an alternative to vtkGeometryFilter, or does anyone have a solution for this (I found an earlier reference<http://www.vtk.org/pipermail/vtk-developers/2006-January/003956.html> to this problem)?
Shall I file this in the bug tracker?

Thanks,
Andreas


Andreas Buykx
Senior Software Engineer

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

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