[vtkusers] Rendering multiple volumes

[Weiguang guan]

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.

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 <mailto: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
>     _______________________________________________
>     Powered by www.kitware.com <http://www.kitware.com>
>
>     Visit other Kitware open-source projects at
>     http://www.kitware.com/opensource/opensource.html
>
>     Please keep messages on-topic and check the VTK FAQ at:
>     http://www.vtk.org/Wiki/VTK_FAQ
>
>     Search the list archives at: http://markmail.org/search/?q=vtkusers
>
>     Follow this link to subscribe/unsubscribe:
>     http://public.kitware.com/mailman/listinfo/vtkusers
>
>
>
>
> -- 
> /| Aashish Chaudhary
> | Technical Leader
> | Kitware Inc.
> /
> /| http://www.kitware.com/company/team/chaudhary.html/

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://public.kitware.com/pipermail/vtkusers/attachments/20151029/c5a87728/attachment.html>