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<div class="moz-cite-prefix">Actually both. However, rendering
disjoint volumes is most needed in our application. I'll try the
"back to front" rendering option. Thanks.<br>
<br>
Best,<br>
Weiguang<br>
<br>
<br>
On 29/10/2015 3:28 PM, Aashish Chaudhary wrote:<br>
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cite="mid:CAEw35Z_7S0c4U7pqYsWSFcu7dHvLhpw_ds+m6sfMs=PO0ahcbg@mail.gmail.com"
type="cite">
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<div class="gmail_quote">On Thu, Oct 29, 2015 at 3:25 PM, Lisa
Avila <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:lisa.avila@kitware.com" target="_blank">lisa.avila@kitware.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
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<div>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).</div>
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<div>My understanding (based on some previous emails) is
that they overlap in 3D space. </div>
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<div>- Aashish </div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
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<div><span class="HOEnZb"><font color="#888888"><br>
<br>
</font></span></div>
<span class="HOEnZb"><font color="#888888">Lisa<br>
<br>
</font></span></div>
<div class="gmail_extra"><br>
<div class="gmail_quote"><span class="">On Thu, Oct 29,
2015 at 11:59 AM, Weiguang guan <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:guanw@rhpcs.mcmaster.ca"
target="_blank">guanw@rhpcs.mcmaster.ca</a>></span>
wrote:<br>
</span>
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<div class="h5">
<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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-- <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
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