[vtkusers] RayCasting through two datasets

[Martin Haidacher]

hi everybody.

I have a problem with Raytracing. I have two datasets (vtkImageData) with 
the same size and at the position where the scalar value of one datasets is 
not zero the scalar value of the other datasets is zero. So, my problem is I 
want to merge the two datasets and raytrace through them, but both datasets 
should have different transfer functions.
how can I make this?

friendly greetings,
Martin.

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