[Paraview] structured to unstructured when using multiblocks filter

[Andy Bauer]

Hi Ufuk,

It looks like you're already using multi-channel input as you're adding
since you have " g_coprocessorData->AddInput(strarr[i]); " unless that's
always just called once. We're just trying to clarify the "inputs" by
naming them channels -- I'm not sure it makes it easier to understand but
it makes it easier to talk about with others that understand that concept
in Catalyst.

Setting whole extent would look like the following at line 129 in
adaptor.cpp:
if (vtkDataSet* grid = vtkDataSet::SafeDownCast(g_coprocessorData->
GetInputDescriptionByName(name)->GetGrid())) {
ParaViewCoProcessing::ClearFieldDataFromGrid(grid);
g_coprocessorData->GetInputDescriptionByName(name)-> SetWholeExtent(ilow,
ihigh, jlow, jhigh, klow, khigh);
} else {

Here, *low and *high are global values. For example, for a 1D case if each
process has 5 points and you have 3 mpi processes
ilow=jlow=jhigh=klow=khigh=0 and ihigh=12. The
vtkStructuredGrid::SetExtent() would look like:
proc 0: 0, 4, 0, 0, 0, 0
proc 1: 4, 8, 0, 0, 0, 0
proc 2: 8, 12, 0, 0, 0, 0

This looks like you're doing it properly in grid.cpp though but I didn't
set the SetWholeExtent() in adaptor.cpp and I'm guessing that's what's
missing.

The multi-channel input should work in 5.4.1 but I found a bug that's been
fixed in the upcoming 5.5 that was affecting Live. See
https://gitlab.kitware.com/paraview/paraview/merge_requests/2212 for
details on that. It's fairly small so you can probably backport that to
your 5.4.1 build if you're more comfortable using 5.4.1.

Cheers,
Andy

On Mon, Mar 19, 2018 at 7:50 AM, Ufuk Utku Turuncoglu (BE) <
u.utku.turuncoglu at be.itu.edu.tr> wrote:

> Hi Andy,
>
> Thanks for your help. Yes, each tile has its own grid information. The
> problem is that if i set whole extent in the adaptor side and write data to
> disk using allinputsgridwrite.py, the whole extent is same with piece
> extent. I am not sure what is going on in the background when live
> visualization activated. If you want to look at it for possible problem,
> the code is in following link (adaptor.cpp and grid.cpp),
>
> https://github.com/uturuncoglu/RegESM/tree/master/cop
>
> The second option is also worth to try but first i need to look at the
> example. BTW, i am using 5.4.1. Do you think that the multi-channel input
> also works with 5.4.1? How it is handled by Catalyst in live mode? Do i
> have multiple visualization pipeline?
>
> Regards,
>
> --ufuk
>
>
> On 19.03.2018 13:36, Andy Bauer wrote:
>
> Hi Ufuk,
>
> Currently a multipiece data set always has to be nested under a multiblock
> dataset. This definitely seems like an unreasonable limitation on a
> structured grid under a multipiece dataset but I suspect we just haven't
> had the resources to put into making this work properly. My suggestion
> would be to try just having your Catalyst adaptor provide a structured grid
> directly, assuming you only have one grid per mpi process, and then try
> volume rendering like that. If you do this though, make sure to set the
> whole extent with vtkCPInputDataDescription::SetWholeExtent().
>
> A thought here -- instead of changing your adaptor to generate the
> structured grid directly instead of a multipiece dataset, maybe create a
> second "channel" through a second vtkCPInputDataDescription that provides
> just a structured grid. This way you can provide both dataset types as
> needed instead of having to modify code back and forth, recompile, etc. to
> get different functionality. See the Examples/Catalyst/CxxMultiChannelInputExample
> in the 5.5 source code for some more details on this.
>
> I can't remember if you were using the editions or just the full ParaView
> Catalyst build but in 5.5 there will be a volume rendering Catalyst
> addition.
>
> Note that the multiblock/multipiece hierarchy will be undergoing a
> significant change in the near future.
>
> Best,
> Andy
>
>
> On Sun, Mar 18, 2018 at 1:21 PM, Ufuk Turuncoglu <
> u.utku.turuncoglu at be.itu.edu.tr> wrote:
>
>> Hi,
>>
>> I am using MPI parallel code under Catalyst co-processing. In this case,
>> i am defining data by creating multi-block dataset and putting multi-piece
>> dataset into the first block (0). In this case, each piece is defined as
>> structured grid. The problem is that, to create volume rendering, i need to
>> use MergeBlocks filter under ParaView but it changes data type from
>> structured grid to unstructured one. I just wonder that is there any way to
>> merge blocks without changing type? Programmable filter etc.? Another
>> workaround could be defining dataset without using multi block under
>> co-processing adaptor code. So, is it possible to represent multi-piece
>> data under co-processing without putting it into multi-bloack dataset.
>>
>> Regards,
>>
>> --ufuk
>>
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