[Paraview] periodic data in ParaView

[Berk Geveci]

> Feature request: I am not aware that vtkMultiBlockDataSet allows the
> definition of block connectivity, yet, I have it for other simulation
> data, but my reader doesn't know what to do with it. Wouldn't a
> multi-block streamer use it if available?

This is a great idea. I would love to see the stream tracer use more
meta-data about block neighbors for performance optimization. We may
get to it at one point. If you have time, I would be happy to make
suggestions on how to implement it.

-berk

On Fri, Jul 10, 2009 at 6:00 AM, Jean Favre<jfavre at cscs.ch> wrote:
> On 09, Jul 2009 03:45 PM, Berk Geveci <berk.geveci at kitware.com> wrote:
>
>>I am afraid there is no direct way. What you can do however, at the
>>cost of more memory, is to use the tranform filter to create a copy
>>(or more) of your dataset that is shifted and then group the result
>>with the Group filter.
>
> I have a similar challenge. A single 3D grid which I warp into a
> spherical grid. The Z=0 and Z=max planes meet at the meridian. All is
> good, iso-contour surfaces for example appear "full". The challenge
> arises when doing streamlines. I have two cases:
>
> A) surface-restricted streamlines on constant-radius surfaces.
> Streamlines don't cross over the meridian line. I fixed this by merging
> the points along the meridian and the surface then appears fully
> connected, i.e. there are no "external" triangle edges.
>
> B) 3D-streamlines, and the the streamlines don't cross over the meridian
> plane.
>
> Berk's comment just make me think that I could make a second copy of the
> spherical grid (a full shallow copy), group the datasets, and use the
> multi-block version of the streamer. (I do streamlines on large
> multi-blocks datasets where the inter-block connectivity is never given
> by the reader, and it works very well. Particles leaving a block find
> their new "host" block and continue along the streamlines). So shouldn't
> that work with two copies of a spherical grid?
>
> Feature request: I am not aware that vtkMultiBlockDataSet allows the
> definition of block connectivity, yet, I have it for other simulation
> data, but my reader doesn't know what to do with it. Wouldn't a
> multi-block streamer use it if available?
>
> Jean--
>
> Swiss National Supercomputing Centre
>
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