[vtkusers] Rendering multiple volumes

[Aashish Chaudhary]

Yes, you could combine two one component data into one two component data
and apply the transfer function appropriately. You can also chose to do
independent or dependent components then.

Have a look at these tests:
https://gitlab.kitware.com/vtk/vtk/blob/master/Rendering/Volume/Testing/Cxx/TestGPURayCastTwoComponentsDependent.cxx


and here:
https://gitlab.kitware.com/vtk/vtk/blob/master/Rendering/Volume/Testing/Cxx/TestGPURayCastThreeComponentsIndependent.cxx

Thanks,

On Wed, Nov 18, 2015 at 11:13 AM, Dženan Zukić <dzenanz at gmail.com> wrote:

> Hi David,
>
> you could work around the issue by having one image, where low values
> represent normal brain tissue and high values represent a lesion. Then make
> a transfer function which assigns gray color to low values, and red color
> to high values. And please report back with the outcome and possibly some
> screenshots.
>
> Regards,
> Dženan
>
> On Sun, Nov 15, 2015 at 6:08 PM, dewarren <davideugenewarren+vtk at gmail.com
> > wrote:
>
>> Weiguang, thanks for the tip — that's interesting.  It's possible such a
>> solution could work for my needs.  Unfortunately, my first attempt to
>> implement it didn't work.  I think that the answer may lie in VTK's
>> definition of a volume.
>>
>> Briefly, the back-to-front rendering solution could work for me depending
>> on
>> what the following means: "multiple volumes do not overlap in 3D space".
>> If
>> that means that two "volumes" (I'm using the term loosely because of my
>> ignorance) can be rendered correctly so long as they don't occupy any
>> common
>> voxels, I think it can work.  If it instead means that two volumes can be
>> rendered correctly only so long as their bounding boxes do not intersect,
>> then it won't work.
>>
>> For example, if I have a brain template and a map of a brain lesion on
>> that
>> template, I could create two arrays that represent the intact and lesioned
>> parts of the brain, and then apply unique transfer functions to each for
>> display (coloring the intact brain in grayscale and the lesion in red,
>> say).
>> The intact and lesioned brain regions would not overlap in space, but they
>> would be adjacent, have a complex boundary, and have overlapping bounding
>> boxes.  Would it be possible to render this scene with VTK currently?
>>
>> Many thanks!
>>
>>
>>
>> --
>> View this message in context:
>> http://vtk.1045678.n5.nabble.com/Rendering-multiple-volumes-tp5734685p5734986.html
>> Sent from the VTK - Users mailing list archive at Nabble.com.
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-- 



*| Aashish Chaudhary | Technical Leader         | Kitware Inc.            *
*| http://www.kitware.com/company/team/chaudhary.html
<http://www.kitware.com/company/team/chaudhary.html>*
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