[vtkusers] Render/mapping progress

[Amy Squillacote]

Hi Patrick,

vtkFixedPointVolumeRayCastMapper may be the only one that directly 
invokes a vtkCommand::ProgressEvent. However, several mappers call 
UpdateProgress (implemented in vtkAlgorithm), which also invokes a 
ProgressEvent. Not necessarily all mappers have progress events, but 
several of them do. In VTK 5.0, the mappers that have progress events are:

vtkFixedPointVolumeRayCastMapper
vtkProjectedTetrahedraMapper
vtkUnstructuredGridVolumeRayCastMapper
vtkUnstructuredGridVolumeZSweepMapper
vtkOpenGLPolyDataMapper

- Amy

Patrick D. Emond wrote:
> Hello all,
>
> I was looking into how to add observers to a mapper's progress and 
> from what I can tell the only mapper class that invokes progress 
> events is vtkFixedPointVolumeRayCastMapper through a macro in 
> vtkFixedPointVolumeRayCastHelper.h called 
> VTKKWRCHelper_IncrementAndLoopEnd()
>
> I was wondering if anyone out there knows why there are no progress 
> events invoked in any other mappers.  My first thought was to go ahead 
> and try to figure out how to implement them, but before I go to the 
> trouble I wanted to know if there is a good reason why this has never 
> been done.
>
> Cheers,
> Patrick
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