<div dir="ltr"><span style="font-size:16px">Hi Weiguang, </span><br><div><span style="font-size:16px"><br></span></div><div><span style="font-size:16px">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. </span><span style="font-size:16px">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 </span><span style="font-size:16px">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. </span></div><div><span style="font-size:16px"><br></span></div><div><span style="font-size:16px">- Aashish </span></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Oct 29, 2015 at 11:59 AM, Weiguang guan <span dir="ltr"><<a href="mailto:guanw@rhpcs.mcmaster.ca" target="_blank">guanw@rhpcs.mcmaster.ca</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">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.<br>
<br>
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.<br>
<br>
Is vtkImageOcclusionSpectrum designed for handling multiple volume rendering? Any comments will be appreciated. Thanks.<br>
<br>
Best,<br>
Weiguang<br>
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</blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature"><div dir="ltr"><font face="trebuchet ms, sans-serif"><i>| Aashish Chaudhary <br>| Technical Leader <br>| Kitware Inc. <br></i></font><div><i><font face="trebuchet ms, sans-serif">| </font><a href="http://www.kitware.com/company/team/chaudhary.html" target="_blank">http://www.kitware.com/company/team/chaudhary.html</a></i></div></div></div>
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