[vtkusers] Help with VolumeRayCast

[Daniel Garcia]

Hello,

I need to get the answer to a little question. Is it possible to
visualise a image with two components using the first component to get
the color and the second to get the opacity?

I want to make a volume render but I have to treat in a different way
one region of interest but the gray intensities more or less the
same....any ideas?

Thank you all

Dani