[Paraview] Executive Not calling RequestData

[Dean, Kevin]

Well, after moving the writer to my RequestData function, I found that the
output is not properly copying the multi-block dataset for some reason.  I
have to try and figure that out...

Kevin E. Dean

On Tue, Jun 30, 2015 at 4:22 PM, Dean, Kevin <
kevin.dean at decisionsciencescorp.com> wrote:

> So I got a little further. Instead I used a multi block data set to load
> my polydata(s). When i update my pipeline, all the information gets
> transferred to ParaView except for the block data. I set up a writer that
> records the data, and that information is exactly the same as the streaming
> data (but it can actually render the blocks). So, I guess you could say I
> am perplexed, ha. Do you have any suggestions?
>
> Thanks Man!
>
> Kevin E. Dean
>
> here's the snippet:
>
> void MultiBlockDataSetDDSReader::UpdatePipeline(vtkMultiBlockDataSet* mb)
> {
>     printf("%s\n", __PRETTY_FUNCTION__);
>
>   MultiBlockDataSetDDSReader::UpdateInformation();
>   vtkStreamingDemandDrivenPipeline* executive =
> vtkStreamingDemandDrivenPipeline::SafeDownCast(MultiBlockDataSetDDSReader::GetExecutive());
>
>   this->multi_block = mb;
>
>   for (int i = 0; i < this->multi_block->GetNumberOfBlocks(); i++)
>   {
>     executive->SetUpdateExtent(0, i,
> this->multi_block->GetNumberOfBlocks(), 0);
>     MultiBlockDataSetDDSReader::Update();
>   }
> }
>
> and my request data:
>
> /*----------------------------------------------------------------------------*/
> int MultiBlockDataSetDDSReader::RequestData(
>   vtkInformation *vtkNotUsed(request),
>   vtkInformationVector **inputVector,
>   vtkInformationVector *outputVector)
> {
>     printf("%s\n", __PRETTY_FUNCTION__);
>   vtkInformation* outInfo = outputVector->GetInformationObject(0);
>   vtkMultiBlockDataSet *output =
> vtkMultiBlockDataSet::GetData(outputVector);
>
>   if (this->multi_block != NULL)
>   {
>     output->ShallowCopy(this->multi_block);
>
>     vtkStreamingDemandDrivenPipeline::CONTINUE_EXECUTING();
>   }
>
>   return 1;
> }
>
> On Fri, Jun 26, 2015 at 9:30 AM, Dean, Kevin <
> kevin.dean at decisionsciencescorp.com> wrote:
>
>> Ok, so I looked through this yesterday and tried implementing some of the
>> code. I now have the poly data information (# of cells, # of points, and
>> Bounds updating in ParaView) However, for poly data objects to be rendered
>> (and their data arrays to be copied to the output), is the best way to set
>> the update extents by:
>>
>> executive->SetUpdateExtent( vtkInformation *, int piece, int numPieces,
>> int ghostLevel );
>>
>> I'm not that familiar with updating unstructured datasets. Image data is
>> simple because the extents are based off the size of the image. Also, for
>> understanding the description of "pieces", since they are subsets of
>> unstructured datasets, does a piece correspond to individual cells or other
>> information held within the poly data? And just one more question, is there
>> a good place to find an explanation of what is / how to set up a PRODUCER,
>> because I read that the producer determines what a piece means...
>>
>> Thanks for the help!
>>
>> Kevin
>>
>> On Thu, Jun 25, 2015 at 6:42 AM, Utkarsh Ayachit <
>> utkarsh.ayachit at kitware.com> wrote:
>>
>>> RequestData doesn't get called unless the pipeline determines that
>>> something has changed. This is at core of VTK's demand driven execution
>>> pipeline. You may want to checkout Berk's blog (
>>> http://www.kitware.com/blog/home/post/831) about how you can use
>>> `CONTINUE_EXECUTING` key for "streaming".
>>>
>>> Utkarsh
>>>
>>> On Wed, Jun 24, 2015 at 2:32 PM Dean, Kevin <
>>> kevin.dean at decisionsciencescorp.com> wrote:
>>>
>>>> I was wondering if anyone has run into this problem before. I am
>>>> streaming vtkPolyData objects into ParaView, but for some reason (after my
>>>> UpdatePipeline function is called), the executive does not call RequestData
>>>> upon an Update command. Could there be any reasons for this?
>>>>
>>>> Here is my snippet:
>>>>
>>>> *void* *VTKPolyDataObjectsDDSReader::UpdateMyPipeline*(vtkPolyData*
>>>> poly_data)
>>>> {
>>>>   // DEBUG:
>>>>   // printf("%s\n", __PRETTY_FUNCTION__);
>>>>
>>>>   VTKPolyDataObjectsDDSReader::*UpdateInformation*();
>>>>   vtkStreamingDemandDrivenPipeline* executive =
>>>> vtkStreamingDemandDrivenPipeline::*SafeDownCast*(
>>>> VTKPolyDataObjectsDDSReader::*GetExecutive*());
>>>>
>>>>   *if* (!executive)
>>>>   {
>>>>     *return*;
>>>>   }
>>>>
>>>>   *this*->poly_data = poly_data;
>>>>
>>>>   *for* (*int* i = 0; i < *this*->poly_data->*GetNumberOfPieces*();
>>>> i++)
>>>>   {
>>>>     executive->*SetUpdateExtent*(0, i, *this*->poly_data->
>>>> *GetNumberOfPieces*(), 0);
>>>>     VTKPolyDataObjectsDDSReader::*Update*();
>>>>   }
>>>> }
>>>>
>>>> Any help is appreciated! Thanks guys.
>>>>
>>>> Kevin E. Dean
>>>>
>>>> P.S. - also attached is a screenshot of what some of the output looks
>>>> like.
>>>>
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>>>
>>>
>>
>

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