[vtkusers] Volume overlay problem

[Sara Rolfe]

Hello,

I'm trying to overlay two volumes for display.  I have not been able  
to find an example like this, and while I did find several questions  
regarding this in the email archives, none of them had answers.   
However, this seems like something that would be commonly used.  If  
there are examples of this somewhere that I have missed, could you let  
me know?

My approach is to map both objects onto the same image in different  
value ranges, and then use a piecewise color map to differentiate  
between them.  I am attaching pictures of the object to be displayed  
in black and white and the color patches to be displayed on top.   
However, my display does not look like I had expected, as seen in the  
third image attached.  I am also including my code.

If you have any suggestions for me, please let me know!

Sara
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