[Paraview] Problem after updating from Paraview 3.8.1 to Paraview 3.12

[Biddiscombe, John A.]

If you're developing an algorithm that changes the dimensions of an image and you want it to work inside paraview, then you'd best just give up and instead throw yourself from a tall building. Especially so if you convert images to meshes or vice versa (or back again to images later). The way structured extents are handled in paraview is so dreadfully poor that even when you get it right, you'll have great trouble if you try to run in parallel. (Some filters will add a ghost level to the information and allow the executives to extend the update extent, others will manually change the update extent inside RequestUpdateExtent and there is no consistency in behaviour).

As you correctly point out, if your pipeline doesn't know the size of the extent until execution time due to some algorithmic twist, life becomes very hard indeed. I would say that getting extents to work wastes more of my time than any other task in paraview development.

One thing that has changed is that one of the extent translators gets replaced early in the pipeline (when you use an image reader I think), and there's an option in the gui under setting to "use strict load balancing" - if you switch this on/off and try again, do you get any better results?

JB

-----Original Message-----
From: paraview-bounces at paraview.org [mailto:paraview-bounces at paraview.org] On Behalf Of David E DeMarle
Sent: 29 November 2011 15:49
To: Jorge Gerardo Peña Pastor; Fred Fred
Cc: paraview at paraview.org
Subject: Re: [Paraview] Problem after updating from Paraview 3.8.1 to Paraview 3.12

Can one of you report this on the bug tracker? Ideally with example code that replicates the problem. There were a handful of changes to VTK/Filtering/vtkStreamingDemandDrivenPipeline that could have caused this.

If the problem is on the bug tracker we are less likely to loose it.

David E DeMarle
Kitware, Inc.
R&D Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4909



2011/11/15 Jorge Gerardo Peña Pastor <jorge.pena.pastor at gmail.com>:
> Hello,
>
> I've managed to run a Paraview based application created with Paraview
> 3.8.1 using Paraview 3.12, but one of my filters is reporting an error 
> it didn't before.
>
> My vtkAlgorithm is a sub-class of vtkImageAlgorithm, which as a result 
> of processing the input data generates a new vtkImageData which is 
> smaller than the original one.
> Before, I managed to use that filter in my application, but now I get 
> the following error:
> ERROR: 
> src/ParaView-3.12.0/VTK/Filtering/vtkStreamingDemandDrivenPipeline.cxx
> ,
> line 1009
> vtkPVCompositeDataPipeline (0x4c3dca0): The update extent specified in 
> the information for output port 0 on algorithm
> vtkConnectedThresholdImageFilter(0x4c3c8d0) is 0 698 0 535 0 114, 
> which is outside the whole extent 408 421 86 106 0 1.
>
> Inside my RequestData I've tried changing all possible combinations of 
> whole extent, update extent and extent for both output and 
> outputInformation without success.
>
> I've found several threads talking about changing 
> StreamDrivenPipeline::WHOLE_EXTENT inside RequestUpdateExtent, but in 
> order to change the value there I need to execute before at least one 
> time my algorithm because the extent depends on the result of the 
> algorithm.
>
> Could someone point me in the right direction to make this work with 
> Paraview 3.12?
>
> Thank you for your help.
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