[vtkusers] Help with VolumeRayCast

Daniel Garcia dgarlor at gmail.com
Fri Jun 10 12:28:17 EDT 2005

Hello Lisa,

Thank you very much, it's slower the vtkFixedPointVolumeRayCastMapper 
than the vtkVolumeRayCastMapper? My volume is quite big and it already 
takes a while to render....thanks.


Lisa Avila wrote:

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