[vtkusers] ErrorEvent observer on algorithms (or vtkClipClosedSurface)

[David Gobbi]

Since it is vtkClipClosedSurface that you are observing, did you set
TriangulationErrorDisplayOn()?  The default behavior of this filter is
to be silent.

 - David

On Thu, Feb 2, 2012 at 5:48 AM, Bryn Lloyd <lloyd at itis.ethz.ch> wrote:
> Hi
>
> I am trying to catch the ErrorEvent on the vtkClipClosedSurface filter in
> python.
>
> I have tried the code from David Gobbi:
> http://www.cognitive-antics.net/mw/index.php?title=VTK/Python_ErrorObserver
>
> I also tried a simple callback:
> def errorEventCallback(obj,eventId):
>    print >>sys.stderr, "ERROR:",obj
>
> clipper.AddObserver('ErrorEvent', errorEventCallback)
> clipper.Update()
>
>
> But it seems the ErrorEvent is not invoked by the vtkErrorMacro. I assume I
> have not attached the error observer to the correct object, but am unclear
> about where I should attach the observer.
>
> This seems to be a question raised again and again. Most examples use e.g. a
> imagereader, some say the observer should be attached to the executive ...
> Mysterious.
>
> Thanks for any clarification
> Bryn