[vtkusers] vtk 6 - multiple outputs filter

[the_shark]

Hello,

first of all my apologies if this is a repost, but after some time looking
here and on the web I got no complete answers...

What I want to do is a filter that has an input (vtkImageData) and I want to
have 2 outputs of types vtkMultiBlockDataSet and vtkHyperOctree. 

my class is now something like 

class my_filter: public vtkImageAlgorithm

and I am a bit confused on some stuff...

First of all, in the RequestData() function do I actually have to perform
the SafeDownCast() for the inputs and outputs?

should the outputs in the main function of the type I want or just:
  vtkAlgorithmOutput* tree_output = filter->GetOutputPort(0); 
  vtkAlgorithmOutput* mbDs_output = filter->GetOutputPort(1);  ?


thank you for your time. If you have some link explaining the filters in
VTK6 thoroughly, I would be thankful.

Best,
Shark 




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