[Paraview] Executive Not calling RequestData

[Dean, Kevin]

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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