[vtkusers] Dual Volume Rendering

[Bill Foster]

Hi,

Being able to display two volumes superimposed over each other is valuable
in medical imaging. I've been trying to display 2 volumes in
SimpleRayCast.tcl. What I tried to do was define 2 functions for:
vtkVolume volume
    volume SetMapper volumeMapper
    volume SetMapper volumeMapper2
    volume SetProperty volumeProperty

The problem is that only one volume is displayed, the 2nd one assigned. I
did the obvious setup of the 2 volume mappers with a reader for each one:
vtkVolumeRayCastMapper volumeMapper
    volumeMapper SetVolumeRayCastFunction compositeFunction
    volumeMapper SetInputConnection [reader GetOutputPort]
vtkVolumeRayCastMapper volumeMapper2
    volumeMapper2 SetVolumeRayCastFunction compositeFunction
    volumeMapper2 SetInputConnection [reader2 GetOutputPort]

I wonder if there is another way to go about this problem. Any advice would
be appreciated.

Many thanks,
Bill
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