Ken and David, The end goal is to be able to chart the ratio of different volumes over a time series.
I started with a hand built pipeline in the client: a wavelet source and a threshold. Attached to each is an Integrate Variables filter which provides the volumes and the ratio is calculated with a Python calculator filter. Then I created a custom filter out of this pipeline. However I discovered that the custom filter is particular about how it is setup. E.g., since it was setup with a wavelet source, it expects a wavelet source and if I attach it to a vtk image data set the result is garbage. That was when I figured I could write a VTK filter and load that as a plugin. I wrote a multiple input connection filter that creates two vtkIntegrateAttribute ivars and calculates the ratio. Following vtkIntegrateAttributes, it outputs the result as a scalar attached to a vertex cell. This works great in serial. Crashes as soon as I attach it to a pipeline when I'm running in parallel. For some reason I had it in my head that each filter stage of the pipeline did a scatter and gather and that my ivars would magically be gathering for me. But when I was reviewing the ParaView guide it finally sunk in that I was getting 2 vtkIntegrateAttribute ivars for each process and that the only gathering was the final image compositing. Mark From: Moreland, Kenneth [mailto:kmo...@sandia.gov] Sent: Friday, March 28, 2014 10:22 AM To: David E DeMarle; Vanmoer, Mark W Cc: paraview Subject: Re: [Paraview] parallel filter question Mark, By the way, we might be able to answer your question better if you gave extra information about what you are trying to do. Short of writing a book on the ins and outs of parallel processing in ParaView, we can only guess what you might need. Most filters, even though they are run in parallel only need to consider the local partition of data they are given. There are, of course, exceptions, but if you give us some hints at what you are trying to do we might be able to give you better advice. -Ken From: David E DeMarle <dave.dema...@kitware.com<mailto:dave.dema...@kitware.com>> Date: Thursday, March 27, 2014 9:21 AM To: "Vanmoer, Mark W" <mvanm...@illinois.edu<mailto:mvanm...@illinois.edu>> Cc: paraview <paraview@paraview.org<mailto:paraview@paraview.org>> Subject: [EXTERNAL] Re: [Paraview] parallel filter question Pretty much yeah. ParaView does interprocess communication as little as it can. Grep for vtkMPIController in ParaViewCore/VTKExtensions and VTK/Filters/Parallel for examples of the mechanics of having parallel filters communicate amongst themselves. David E DeMarle Kitware, Inc. R&D Engineer 21 Corporate Drive Clifton Park, NY 12065-8662 Phone: 518-881-4909 On Thu, Mar 27, 2014 at 11:00 AM, Vanmoer, Mark W <mvanm...@illinois.edu<mailto:mvanm...@illinois.edu>> wrote: Hi all, I'm actually new to nuts and bolts parallel programming, so this question might be a bit basic. I was re-reading section 13.4 of the ParaView Guide and wanted to clarify, is it correct to say that ParaView only does gathering for the image output that IceT is going to composite? That for filters that need to use any other data from the pipeline for non-image output, that gathering has to be done by hand? Mark _______________________________________________ Powered by www.kitware.com<http://www.kitware.com> Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Please keep messages on-topic and check the ParaView Wiki at: http://paraview.org/Wiki/ParaView Follow this link to subscribe/unsubscribe: http://www.paraview.org/mailman/listinfo/paraview
_______________________________________________ Powered by www.kitware.com Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Please keep messages on-topic and check the ParaView Wiki at: http://paraview.org/Wiki/ParaView Follow this link to subscribe/unsubscribe: http://www.paraview.org/mailman/listinfo/paraview
