[vtkusers] Rendering multiple volumes

[Aashish Chaudhary]

On Thu, Oct 29, 2015 at 1:07 PM, Weiguang guan <guanw at rhpcs.mcmaster.ca>
wrote:

> Thanks, Aashish, for confirming it and providing a workaround. Hope my
> post + other related posts would bump it up a bit in the priority list.
>

I am sure it will. Can you send me some sample dataset so that I can play
around? Working with real use-cases is always more fun than using the
wavelet or other sample data we have. Also, if you can share some screen
captures, that would be great (if possible). You can send me an email
privately for those if that's more comfortable. We always like to hear back
from the community.

Thanks,
- Aashish


>
> Best,
> Weiguang
>
>
> On 29/10/2015 12:14 PM, Aashish Chaudhary wrote:
>
> Hi Weiguang,
>
> Yes, a true multi volume rendering is not supported in current GPU
> mappers. This is a interesting task and we talked about implementing it but
> didn't hit high in our priority list. I think there could be some
> interesting questions / answer related to this on blending and mixing. One
> thing you could do (if possible) is that you can combine two volumes into
> one with two components (assuming that each has one) if you need something
> soon. Also, I believe the texture mapping mapper works because it crates
> these polygonal slices but I would imaging that even it would not do the
> right thing completely (it may look right though) in all circumstances
> since its not going to sort slices between two volumes.
>
> - Aashish
>
> 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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>
>
>
> --
>
>
>
> *| Aashish Chaudhary | Technical Leader          | Kitware Inc.
> *
> *| http://www.kitware.com/company/team/chaudhary.html
> <http://www.kitware.com/company/team/chaudhary.html>*
>
>
>


-- 



*| 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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