[vtkusers] Help with VolumeRayCast

[Daniel Garcia]

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.

Daniel



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
>> _______________________________________________
>> This is the private VTK discussion list.
>> Please keep messages on-topic. Check the FAQ at: 
>> http://www.vtk.org/Wiki/VTK_FAQ
>> Follow this link to subscribe/unsubscribe:
>> http://www.vtk.org/mailman/listinfo/vtkusers
>
>
>
>