[vtkusers] Writing MultiBlock datasets

[Utkarsh Ayachit]

Oh another thing, you cannot directly instantiate 
vtkXMLCompositeDataWriter since it's an abstract class. So,

...
vtkXMLCompositeDataWriter* mbw  = vtkXMLMultiBlockDataWriter::New();
...

Utkarsh

Utkarsh Ayachit wrote:
> You don't have to "get the output" from a vtkMultiBlockDataSet. 
> vtkMultiBlockDataSet is itself the dataobject that can be set as the 
> input to a filter/writer.
> 
> To reiterate Amy, try:
> 
> vtkMultiBlockDataSet* mb = vtkMultiBlockDataSet::New();
> ...
> vtkXMLCompositeDataWriter* mbw = vtkXMLCompositeDataWriter::New();
> mbw->SetInput(mb); // directly set "mb" as the input no need to do        
>            // somethign like mb->GetOutput().
> 
> Utkarsh
> 
> Renato N. Elias wrote:
>>
>> yes, in fact, it was my first try. The problem is that I don't know 
>> how to get the output from vtkMultiBlockDataSet. How should 
>> classvtkXMLCompositeDataWriter and vtkMultiBlockDataSet be connected?
>>
>> Renato.
>>>
>>>
>>> Have you tried calling mbw->SetInput(mb)?
>>>
>>> - Amy
>>>
>>> Renato N. Elias wrote:
>>>> Hi folks,
>>>>
>>>> does anybody could give me a hand in writing a vtkMultiBlockDataSet. 
>>>> I saw there's a  vtkXMLCompositeDataWriter 
>>>> <http://www.vtk.org/doc/nightly/html/classvtkXMLCompositeDataWriter.html#f2b96e41718dcb0bc93db39ad82675ad> 
>>>> and a derived vtkXMLMultiBlockDataWriter 
>>>> <http://www.vtk.org/doc/nightly/html/classvtkXMLMultiBlockDataWriter.html> 
>>>> the problem is that I can't do something like:
>>>>
>>>> // creating a multiblock object
>>>> vtkMultiBlockDataSet* mb= vtkMultiBlockDataSet::New();
>>>>
>>>> // Assign some stuffs
>>>> mb->SetBlock(0, ???)
>>>> mb->SetBlock(1, ???)
>>>> mb->SetBlock(2, ???)
>>>>
>>>> // Create the writer
>>>> vtkXMLCompositeDataWriter* mbw = vtkXMLCompositeDataWriter::New();
>>>>
>>>> // Set the filename
>>>> mbw->SetFileName("test.vtm");
>>>>
>>>> // Setting up the connection <--- HERE'S MY DOUBT
>>>> mbw->SetInputConnection(mb->GetOutput());
>>>>
>>>> // Write the data
>>>> mbw->Write();
>>>>
>>>> since vtkMultiBlockDataSet does not have a "GetOutput" method.
>>>>
>>>> Does anyone could supply an example?
>>>>
>>>> Thanks
>>>>
>>>> Renato.
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>>>>
>>>
>>
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>