[Paraview] Simple Filter Problem

[Wolfgang Lechner]

Hi

I have expanded the vtkSimpleImagetoImage Filter to substract the
horizontal average of each plane of a 3d box to display the relative
fluctuations only. The project is attached. 
The problem is : 
After applying the Filter I get a completely white box, althought the
values I set with outPtr[index] = inPtr[index] - horizontal[i]; seem
to be correct when printing them with printf.
and .
Why is the Contour-Filter disabled after applying the HA-Filter?

thanks in advance
Wolfgang Lechner
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