[vtkusers] Fixing Python examples; question about best practice...

[diego0020]

Great work

My understanding is that mapper.SetInputConnection( source.GetOutputPort() )
creates a pipeline connection. This means that any changes in the input will
be propagated to the mapper. This is used for example to connect several
filters in a chain, and have changes propagate across the pipeline.

mapper.SetInputData( source ) is used where source is a static object, like
some polydata read from a file.

mapper.SetInput( source.GetOutput() ) could be used to connect the mapper to
the output of a filter, but without creating a pipeline connection. In this
case the current output will be the one the mapper will see. This would
usually be used after calling source.Update(); and if you know the filter or
its input will never change again. I think it is better to stay away from
this.

For me, the best practices would then be:
Use mapper.SetInputConnection( source.GetOutputPort() ) for connecting to
filters
Use mapper.SetInputData( source ) for connecting to static objects 

This is only my opinion though. 

Best regards




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