[vtkusers] Rendering multiple volumes

[Weiguang guan]

Have just tried it out --- It works great! Thanks, Lisa.

Best,
Weiguang

On 30/10/2015 10:02 AM, Lisa Avila wrote:
> Weiguang,
>
> That should work - if you run into issues let us know.
>
> Lisa
>
>
> On Fri, Oct 30, 2015 at 9:24 AM, Weiguang guan 
> <guanw at rhpcs.mcmaster.ca <mailto:guanw at rhpcs.mcmaster.ca>> wrote:
>
>     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.
>>     /
>>     /| http://www.kitware.com/company/team/chaudhary.html/
>
>

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