[vtk-developers] Re: Understanding vtkMultiGroupDataGroupFilter

[Berk Geveci]

Can you post your new pipeline? Are you using 5.0 or CVS?

-Berk

On 5/30/06, Bill McGrory <mcgrory at aerosft.com> wrote:
>
> Responding to my own e-mail.
> I implemented a vtkMultiGroupDataGroupFilter::RequestDataObject, and
> filled the the vtkMultiGroupDataSet with vtkDataSet's that were obtained
> from the input connections to the filter.
>
> this got me past the error listed below, but now I fail, because
> ExecuteDataForBlock doesn't use my created vtkMultiBlockDataSet from the
> request.
>
> In trying to understand this filter, I compared it to other
> vtkMultiGroupDataSetAlgorithm's and I noticed that
> vtkMultiGroupDataExtractDataSets and vtkMultiGroupDataExtractGroup both
> implement ::RequestInformation and fill a vtkMultiGroupDataInformation
> object with information about the children. So I tried to implement a
> similar method in vtkMultiGroupDataGroupFilter, and that didn't seem to
> have any effect.
>
> So, next, I tried to change my pipeline. I filled a vtkMultiGroupDataSet
> with statically created vtkStructuredGrids. I then fed this
> vtkMultiGroupDataSet into a vtkMultiGroupDataExtractGroup and fed that
> filter as input to my pipeline below. When I do this, I get the same
> error as listed below.
>
> So, it appears to me that none of the vtkMultiGroupDataSetAlgorithms
> work correctly with vtkMultiGroupDataGeometryFilter. Is there truth to
> this?
>
> On Sat, 2006-05-27 at 16:09 -0400, Bill McGrory wrote:
> > Trying to get new pipeline set up for a multiblock dataset.
> > Following the suggestions of Berk, from previous thread, I'm now using a
> > vtkStructuredGridAlgorithm as a source to create a vtkStructuredGrid
> >
> >
> > I'm feeding the output ports of the algorithm into a
> > vtkMultiGroupDataGroupFilter in order to create a vtkMultiGroupData
> > which contains only vtkStructuredGrid's
> >
> > my pipeline is below.
> >
> > The problem as this is implemented is this:
> >
> > When vtkCompositeDataPipeline::ExecuteDataObjectForBlock is called,
> > vtkMultiGroupDataGroupFilter::ExecuteData has yet to be called.
> > However, that is where the vtkMultiGroupDataSet has the children loaded.
> > This means that there are no datasets in the multigroupdataset, so the
> > request for a block data object fails, and a simple polydata object is
> > passed down the pipeline. At this point, the vtkStructuredGridOutline
> > filter fails, because, it does a check to make sure the input port is
> > correctly set to vtkStructuredGrid, and it's set to the dummy
> > vtkPolyData.
> >
> > Is this a bug, or am I still trying to do something that's not
> > supported?
> >
> > Regards, Bill
> >
> >
> >
> > MyStructuredGridAlgorithm *sgridsrc0 = MyStructuredGridAlgorithm::New();
> > MyStructuredGridAlgorithm *sgridsrc1 = MyStructuredGridAlgorithm::New();
> >
> > sgridsrc0->myoffset = 0.;
> > sgridsrc1->myoffset = 3.;
> >
> > vtkMultiGroupDataGroupFilter *mbFilter =
> > vtkMultiGroupDataGroupFilter::New();
> >
> > mbFilter->SetInputConnection(0,sgridsrc0->GetOutputPort(0));
> > mbFilter->AddInputConnection(0,sgridsrc1->GetOutputPort(0));
> >
> > vtkStructuredGridOutlineFilter *outlineFilter =
> > vtkStructuredGridOutlineFilter::New();
> >
> > outlineFilter->SetInputConnection(0, mbFilter->GetOutputPort(0));
> >
> > vtkMultiGroupDataGeometryFilter *mgdgFilter =
> > vtkMultiGroupDataGeometryFilter::New();
> > mgdgFilter->SetInputConnection(0, outlineFilter->GetOutputPort(0));
> >
> > vtkPolyDataMapper* mapper = vtkPolyDataMapper::New();
> > mapper->SetInputConnection(0, mgdgFilter->GetOutputPort(0));
> >
> >
> >
> --
> Dr. William D. McGrory    AeroSoft, Inc.
> mcgrory at aerosft.com       Suite 1275
> (540) 557-1904            1872 Pratt Drive
> (540) 557-1919 (FAX)      Blacksburg, VA 24060
>
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