<div dir="ltr"><div class="markdown-here-wrapper" style="font-family:"Lucida Sans",Cantarell,Verdana,sans-serif;color:rgb(11,83,148)"><p style="margin:0px 0px 1.2em!important">Hi Andras,<br><br></p><p style="margin:0px 0px 1.2em!important">Note that the vtkGPUVolumeRayCastMapper already supports labeled data rendering.<br><br></p><p style="margin:0px 0px 1.2em!important">Take a look at <code style="font-size:0.95em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(218,218,218);background-color:rgb(232,232,232);border-radius:3px;display:inline">TestGPURayCastCompositeMask</code> and <code style="font-size:0.95em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(218,218,218);background-color:rgb(232,232,232);border-radius:3px;display:inline">TestGPURayCastCompositeMaskBlend</code>.<br><br></p><p style="margin:0px 0px 1.2em!important">Sankhesh<span style="font-size:0em"></span></p></div></div><br><div class="gmail_quote"><div dir="ltr">On Thu, Jun 7, 2018 at 12:08 PM Andras Lasso <<a href="mailto:lasso@queensu.ca">lasso@queensu.ca</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal"><span style="color:#1f497d">I would be interested in a good solution to this, too.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d">In 3d Slicer, we’ve been using flying edges filter, which creates usable (non-blocky) surfaces very quickly (suitable for interactive editing). The limitation is that we still need a smoothing filter to avoid
all staircase artifacts, and that it increases update time by about a magnitude.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d">We’ve been evaluating using multi-volume rendering for displaying segmentation in 3D, to achieve faster updates and nicer transparent renderings. Multi-volume rendering is good because we can apply Gaussian smoothing
on each input volume to get correctly reconstructed (non-blocky) surface and we can display overlapping segments. However, this Gaussian smoothing takes some time (still competitive with surface smoothing) and multi-volume renderer does not support shading
yet (this is the blocking issue right now).<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d">Andras<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d"><u></u> <u></u></span></p>
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<p class="MsoNormal"><b>From:</b> vtkusers <<a href="mailto:vtkusers-bounces@public.kitware.com" target="_blank">vtkusers-bounces@public.kitware.com</a>> <b>
On Behalf Of </b>Bertram Sabrowsky-Hirsch<br>
<b>Sent:</b> Thursday, June 7, 2018 3:54 AM<br>
<b>To:</b> <a href="mailto:vtkusers@vtk.org" target="_blank">vtkusers@vtk.org</a><br>
<b>Subject:</b> [vtkusers] Smooth label-map volume rendering<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><span lang="EN-GB">Hi all,<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB">I am working with volume data before and after a classification algorithm.
<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB">The input volume has ushort intensity values, the output volume is a label-map where the values indicate each voxels class/label (background=0, vessel=1, aneurysm=2, …).<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB">I am visualizing the input volume with a opacity transfer function that simulates a threshold filter (e.g. control points: 799=0.0, 800=1.0) and the result is a nice and smooth visualization of the volume.<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB">However, the output volume has this blocky Minecraft style effect. The opacity transfer function has the control points: 0=0.0, 1=1.0 and I use the color transfer function to distinguish the classes/labels.<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB">Is there a way to visualize the output volume in a similar way as the input volume? I considered generating iso-surface meshes and smooth those, but this is not really an option. I also don’t really understand why this
is an issue because the<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB">Input volume is also rendered with a distance of 1 between the two opacity thresholds. Are the volumes handled differently by vtk and how?<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB">Input volume:<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB"><img width="324" height="286" style="width:3.375in;height:2.9791in" id="m_1072328669617055056Picture_x0020_2" src="cid:image001.jpg@01D3FE56.AEDC44B0"></span><span lang="EN-GB"><u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB">Output volume:<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB"><img width="324" height="304" style="width:3.375in;height:3.1666in" id="m_1072328669617055056Picture_x0020_1" src="cid:image002.jpg@01D3FE56.AEDC44B0"></span><span lang="EN-GB"><u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB">Kind regards,<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB">Bertram<u></u><u></u></span></p>
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</blockquote></div>-- <br><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div class="inbox-inbox-inbox-inbox-inbox-inbox-inbox-markdown-here-wrapper" style="font-family:"proza libre",sans-serif;color:rgb(0,56,107)"><h5 id="inbox-inbox-inbox-inbox-inbox-inbox-inbox-sankhesh-jhaveri" style="margin:1.3em 0px 1em;padding:0px;font-size:1.1em;border-bottom-width:1px;border-bottom-style:solid;border-bottom-color:rgb(238,238,238);font-weight:bold;color:rgb(11,65,148)">Sankhesh Jhaveri</h5>
<h6 id="inbox-inbox-inbox-inbox-inbox-inbox-inbox--sr-research-development-engineer-kitware-http-www-kitware-com-518-881-4417" style="margin:1.3em 0px 1em;padding:0px;font-size:1em;color:rgb(11,83,148);font-family:"open sans",sans-serif;font-weight:normal"><em>Sr. Research & Development Engineer</em> | <a href="http://www.kitware.com/">Kitware</a> | (518) 881-4417</h6>
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