[vtkusers] (bug?) vtkTransform.GetOrientationWXYZ segmentation fault after hand-inverting scaling

[Stefano TRAPANI]

Hi everybody

Working with vtkTranform, I have come across several segmentation faults 
which are apparently caused by calls to the GetOrientationWXYZ method.

After some tests, I realized that this happens with transforms that change
the hand of space, like inversions and mirror reflections. (I define this
kind of transforms by setting appropriate negative Scale parameters).

A simple python example that ends up with a segmentation fault is the
following:

from vtk import *
T = vtkTransform()
T.Scale(-1,-1,-1)
T.GetOrientationWXYZ()

Has anybody observed a similar behaviour ? Is this a bug in
GetOrientationWXYZ() ?

I am using VTK 5.0.3 with Python 2.5.2 [GCC 4.3.2] from Mandriva 2009.




Stefano TRAPANI

Centre de Biochimie Structurale (CBS)
CNRS UMR 5048; UM1; UM2; INSERM UMR 554
29 rue de Navacelles 34090
MONTPELLIER Cedex - France

Tel : +33 (0)4 67 41 77 29
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