[vtkusers] MultiBlock & vtkContourFilter

[Randall Hand]

Takes 2 weeks and finally a non-kitware reponse.  Gotta love all that $$ we
shell out for VTK Support here...

Thanks for the tip Berk.  I finally got it to work by loading all the
outputs into vtkHierarchicalBoxDataSet, and connecting my vtkContourFilter
to that.  I then did the following:

    vtkHierarchicalDataSetGeometryFilter *hdsgf =
vtkHierarchicalDataSetGeometryFilter::New();
    hdsgf->SetInputConnection(0, filter->GetOutputPort(0));

And connected the "hdsgf" to the Mapper.  This works pretty well.  But it
seems that it doesn't work for all filters.  I tried adding a
vtkArrayCalculator in the mix to compute the Vorticity Magnitude, and I kept
getting errors about input ports.  I finally had to construct 14
ArrayCalculators and load their outputs into the starting
vtkHierarchicalBoxDataSet.

Should I have been able to insert the vtkArrayCalculator into the pipeline?
Is there a better way of dealing with multiblock datasets like this
(Including AMR & such)?  A more generic way that I can use across multiple
dataset formats, similar to how paravew "transparently" makes it work.

As for just using Paraview, it's not an option until the WebVis stuff is
rolled out, so a year or two.

On 12/13/05, Berk Geveci <berk.geveci at gmail.com> wrote:
>
> You have a few choices:
>
> 1. Use vtkPLOT3DReader. This reader will produce one output per block. You
> have to create multiple pipelines to process them.
> 2. Use ParaView.
> 3. Use vtkMultiBlockPLOT3DReader and the multi-block pipeline. Look at
> VTK/Graphics/Testing/Cxx/TestMultiBlock.cxx
>
> -Berk
>
> On 11/29/05, Randall Hand <randall.hand at gmail.com > wrote:
>
> > I'm reading a plot3d file (XYZ & Q) with the vtkPLOT3DReader object.
> > The file seems to load just fine, but when I analyze it and try to do
> > Isosurfaces it doesn't work.  Closer inspection seems to indicate that using
> > the ->GetOutput method returns only  one block of the entire dataset.  How
> > do I get the entire dataset, and how do I get this into a
> > vtkContourFilter-like object for isosurfacing?
> >
> > --
> > Randall Hand
> > Visualization Scientist,
> > ERDC-MSRC Vicksburg, MS
> > Homepage: http://www.yeraze.com
> > _______________________________________________
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> >
> >
>


--
Randall Hand
Visualization Scientist,
ERDC-MSRC Vicksburg, MS
Homepage: http://www.yeraze.com
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