[vtkusers] ErrorEvent observer on algorithms (or vtkClipClosedSurface)

[Bryn Lloyd]

Same if I use this form:

             clipper.AddObserver("ErrorEvent", e)



On 2/2/2012 2:29 PM, Bryn Lloyd wrote:
> Yes, this is the usage:
>
>             clipper = vtk.vtkClipClosedSurface()
>             clipper.SetInputConnection(input.GetProducerPort())
>             clipper.SetClippingPlanes(planes)
>             clipper.TriangulationErrorDisplayOn()
>             clipper.PassPointDataOn()
>             e = ErrorObserver()
>             clipper.AddObserver("ErrorEvent", errorEventCallback)
>             clipper.Update()
>
>             if e.ErrorOccurred():
>                 print >>sys.stderr, "ERROR:",e.ErrorMessage()
>
> The vtkWin32OutputWindow pops up and the error is displayed. But the 
> ErrorEvent is not invoked.
>
> Thanks
> /Bryn
>
>
>
>
> On 2/2/2012 2:17 PM, David Gobbi wrote:
>> 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
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