Hi, Filters have their RequestData called twice when using a parallel server. This happens when the filter is first added - subsequent "Apply"s only called it once.
To reproduce: First run a parallel server, attach a debugger and set a breakpoint in "vtkArrayCalculator::RequestData" Create a Box source Use calculator to add an array, e.g. "coordsX" Click Apply [ RequestData gets called twice ] Update arrat , e.g. "coordsX + 0" Click Apply [ RequestData only gets called once ] I've added a bug report - http://www.paraview.org/Bug/view.php?id=12546 Regards, Paul
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