[Paraview] CoProcessing question

[Moreland, Kenneth]

Actually, I think there is an issue with structured extents.  The problem with structured extents is that ParaView/VTK will ask for a particular extent on each process, and these extents are not likely to match up with what is actually available on that process.  It situation is stupid because the extents are picked arbitrarily, and everyone would be happy with the extents available from the FORTRAN code, but there is no way for the CoProcessing library to force the pipeline to accept certain extents.

The only way around the problem right now that I know of is to place the data in a multiblock structure like AMR.

-Ken


On 7/28/10 9:59 AM, "Andy Bauer" <andy.bauer at kitware.com> wrote:

Hi John,

I'd like to think it works but as I haven't tested it to do that I'm not going to promise that it works :)  It uses a TrivialProducer to insert the data set/composite data set into the pipeline with the idea that coprocessing should essentially execute almost exactly the same as any corresponding paraview python script for pvbatch.

Since you're asking about it though I'll try to look at it this week and get back to you.  If you get to it sooner than I do and find a bug then I'd also be more than happy to try and fix it.

Andy

On Wed, Jul 28, 2010 at 11:02 AM, Biddiscombe, John A. <biddisco at cscs.ch> wrote:
I'm experimenting with the coProcessing library. It's very nice. Well done you guys.

Question : I have a Fortran code generating a slab of data (volume, actually a rectilinear grid, but for now I'll be happy with a volume).

I can send the data into the adaptor and generate datasets, all is well. On a single process all seems to be normal, but before I start on lots of cores .....

The data is divided among processes such that I need to worry about whole extents, and piece extents.

Can I export individual image data (rectilinear grid) pieces from each process, set the extent locally and let the usual paraview pipeline handle it. Normally (in a reader) I'd be getting piece numbers and all that and I'm not sure if this will be transparent or not.

The Phasta (I think) example, uses a multiblcok structure, which I'd prefer to avoid. a Multipiece dataset is fine...is there a volume example anywhere?

Thanks

JB



   ****      Kenneth Moreland
    ***      Sandia National Laboratories
***********
*** *** ***  email: kmorel at sandia.gov
**  ***  **  phone: (505) 844-8919
    ***      web:   http://www.cs.unm.edu/~kmorel

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