[vtkusers] ErrorEvent observer on algorithms (or vtkClipClosedSurface)

[David Gobbi]

Does clipper.HasObserver("ErrorEvent") return true?


On Thu, Feb 2, 2012 at 6:32 AM, Bryn Lloyd <lloyd at itis.ethz.ch> wrote:
> 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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