[vtkusers] Rendering multiple volumes

[Weiguang guan]

Actually both. However, rendering disjoint volumes is most needed in our 
application. I'll try the "back to front" rendering option. Thanks.

Best,
Weiguang


On 29/10/2015 3:28 PM, Aashish Chaudhary wrote:
> On Thu, Oct 29, 2015 at 3:25 PM, Lisa Avila <lisa.avila at kitware.com 
> <mailto: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 <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
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> /| Aashish Chaudhary
> | Technical Leader
> | Kitware Inc.
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> /| http://www.kitware.com/company/team/chaudhary.html/

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