[vtk-developers] vtkSelectVisiblePoints on empty data set

[Andreas Buykx]

Hi all,

I have a pipeline in my application that should display the ids of visible points, using a.o. the vtkSelectVisiblePoints filter. The input to this filter is a - possibly empty - selection of the original data set.
When the set is in fact empty, I get a lot of the following errors:
ERROR: In <path-deleted>/VTK/src/Filtering/vtkExecutive.cxx, line 753
vtkStreamingDemandDrivenPipeline (0x32b8700): Algorithm vtkSelectVisiblePoints(0x3168ea0) returned failure for request: vtkInformation (0x3340180)
  Debug: Off
  Modified Time: 23448
  Reference Count: 1
  Registered Events: (none)
  Request: REQUEST_DATA
  FROM_OUTPUT_PORT: 0
  FORWARD_DIRECTION: 0
  ALGORITHM_AFTER_FORWARD: 1

I looked in the code and found that this filter returns a 0 from RequestData if the input dataset is empty. In my situation an empty input dataset is a valid input condition and I'd like to prevent all these errors. What are my options?

Thanks for your help!
Andreas Buykx
Senior Software Engineer

TNO DIANA BV
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