[vtkusers] VTK 6 vtkCompositeDataDisplayAttributes

[Chao Liang]

Hi,

>From this example,
http://vtk.org/gitweb?p=VTK.git;a=blob;f=Rendering/OpenGL/Testing/Cxx/TestMultiblockDisplayProperties.cxx
It shows how to color each block on a multiblockdataset, but this dataset
is get from a reader:
vtkXMLMultiBlockDataReader

Then the key line is:
mapper->SetInputConnection(reader->GetOutputPort());
then it works, i can see different colors on different blocks.

But in my case, say, I already have a vtkMultiBlockDataSet *mb in my code,
so I don't need to use any reader. Then this is what I did:

vtkCompositeDataGeometryFilter *sgfilter =
vtkCompositeDataGeometryFilter::New();
sgfilter->SetInputData(mb);
sgfilter->Update();
mapper->SetInputConnection(sgfilter->GetOutputPort());

But it doesn't work, I cannot see different colors as I expected.

So, what should I do in my case in order to use
vtkCompositeDataDisplayAttributes class to show different colors in
different blocks.

Thanks in advance.

Chao
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