[vtkusers] Ray cast composite function

[Hellice]

Hi all vtk Pro

I was reading the source code of  vtkVolumeRayCastCompositeFunction and i
found more than 5 different type of ray cast function ; my question is how
we do know whis one have been used on our volume since we just call this on
volume rendring

	vtkVolumeRayCastCompositeFunction  *compositeFunction =       
vtkVolumeRayCastCompositeFunction::New();
	vtkVolumeRayCastMapper *volumeMapper = vtkVolumeRayCastMapper::New();
	volumeMapper->SetVolumeRayCastFunction( compositeFunction );
	volumeMapper->SetInputConnection (imageCast->GetOutputPort());


please i have to know this so i hope you have some answers

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