[vtkusers] Algorithm base class question

[Benjamin Schindler]

Hi

Thanks for the very quick response. The problem I have behind is, that
upon calling GetOutput on the Algorithm, I get a: 

vtkStreamingDemandDrivenPipeline (0x910fbb0): Algorithm
vtkSPHSliceFilter(0x91e0650) returned failure for request:
vtkInformation (0x914b438)
  Debug: Off
  Modified Time: 1918
  Reference Count: 1
  Registered Events: (none)
  Request: REQUEST_DATA_OBJECT
  ALGORITHM_AFTER_FORWARD: 1
  FORWARD_DIRECTION: 0
  FROM_OUTPUT_PORT: 0

I guessed, that since vtkPointSetAlgorithm (according to the docs) takes
same input as output. I assumed this is the case even if you override
FillInputPortInformation. So switching over to vtkPointSetAlgorithm did
not solve my problems. I attached the source of the filter, but I'm not
sure it helps, because I put a breakpoint on every function in the
source file and never hit any before getting the error
Any ideas?

Thanks
Benjamin

On Mon, 2008-10-27 at 10:28 -0500, Amy Squillacote wrote:
> Hi Benjamin,
> 
> You could create a vtkPointSetAlgorithm and override its 
> FillInputPortInformation method so that it takes a vtkMultiBlockDataSet 
> rather than a vtkPointSetAlgorithm. Take a look at how this method is 
> overridden in VTK/Graphics/vtkThreshold.cxx.
> 
> - Amy
> 
> Benjamin Schindler wrote:
> > Hi
> >
> > I'm writing for testing a filter that takes a MultiBlockDataSet and
> > outputs a PointSet. What base-class is most suitable for this kind of
> > filter? I looked at PointSetAlgorithm, but the doc says it must also
> > take a PointSet as input... 
> >
> > Thanks
> > Benjamin
> >
> > _______________________________________________
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