[vtkusers] Rendering multiple volumes

[Aashish Chaudhary]

On Thu, Oct 29, 2015 at 3:25 PM, Lisa Avila <lisa.avila at kitware.com> wrote:

> Do you mean that the volumes overlap in 3D space, or just overlap in image
> space? If the volumes overlap in image space (two disjoint volumes where
> sometimes one is in front of the other) VTK does render this correctly (you
> need to turn back to front rendering on in the culler in the renderer). It
> is true that VTK does not correctly handle volumes that overlap in 3D
> space, unless they are aligned and part of the same volume (multiple
> components in one vtkImageData).
>

My understanding (based on some previous emails) is that they overlap in 3D
space.

- Aashish

>
>
> Lisa
>
>
> On Thu, Oct 29, 2015 at 11:59 AM, Weiguang guan <guanw at rhpcs.mcmaster.ca>
> wrote:
>
>> There were a few posts in the past about this topic. The conclusion
>> seemed to be that VTK didn't support multi-volume rendering in terms of
>> proper visibility sorting/blending. I'm not sure it is still true.
>>
>> I've done a test where two partially overlapped volumes are used. I've
>> found that only the texture mapping mapper can render them correctly. All
>> the other mappers (GPU based or ray casting) always have one volume occlude
>> the other one no matter what direction the camera is viewing.
>>
>> Is vtkImageOcclusionSpectrum designed for handling multiple volume
>> rendering? Any comments will be appreciated. Thanks.
>>
>> Best,
>> Weiguang
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>
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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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