[vtkusers] Help with VolumeRayCast

Lisa Avila lisa.avila at kitware.com
Fri Jun 10 10:37:35 EDT 2005

Hello Daniel,

Yes - if you are using the nightly VTK use 
vtkFixedPointVolumeRayCastMapper. Give it input that have two component 
scalars. The first component will be used to lookup color, and the second 
will be used to lookup opacity as long as you set IndependentComponentsOff 
on the vtkVolumeProperty (otherwise two color transfer functions and two 
opacity transfer functions will be used and the final results blended per 


At 08:32 AM 6/10/2005, Daniel Garcia wrote:
>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
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