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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy">Hello Nicholas,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy">The two views on the videos are not marked. I know what is isosurface, so the volumetric is apparently segmentation, but for someone else it may be not so obvious.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy">The isosurface view is generally clearer and easier to understand. But it’s clear that some part of information is lost, for example, objects of low density. Experts
on the subject should decide whether the lost information is important. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy">From the 3D graphics point of view, I have noticed that the volumetric view has only one set of textured layers, and the objects become transparent and disappear
when the view is rotated 90œ to the camera. I would recommend creating three sets of textured layers, orthogonal to each other, and changing their transparency in real time depending on the viewpoint position. You will have to choose the angle-transparency
relationship by trial and error to eliminate artifacts such as “wobbling” and abrupt changes of transparency.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy"> Sergey Bederov<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:navy"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> X3D-Public [mailto:x3d-public-bounces@web3d.org]
<b>On Behalf Of </b>Nicholas Polys<br>
<b>Sent:</b> Saturday, December 22, 2012 1:47 AM<br>
<b>To:</b> med@web3d.org; HCI-Students; x3d-public; x3d@web3d.org<br>
<b>Subject:</b> [X3D-Public] Online graphics survey: volume rendering techniques<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Greetings all~<br>
<br>
This email is an invitation to participate in an online study we are conducting. We have processed a set of multi-channel microscopy stacks (from
</span><a href="http://cellimagelibrary.org" target="_blank"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">cellimagelibrary.org</span></a><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">) with two different pipelines and X3D
techniques, Segmented Volume rendering and ISOSurface Volume rendering. </span>We would like your help in comparing these two techniques!<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:black">Please visit the following link to the survey and submit your answers. Viewing the six examples and and answering the questions should take about 25 minutes:</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><a href="https://survey.vt.edu/survey/entry.jsp?id=1355866408333" target="_blank"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">https://survey.vt.edu/survey/entry.jsp?id=1355866408333</span></a><o:p></o:p></p>
<p><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Thanks in advance for your participation!</span><span style="font-size:10.0pt"><o:p></o:p></span></p>
<p><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">You are welcome to email me with any questions.</span><span style="font-size:10.0pt"><o:p></o:p></span></p>
<p><span style="font-size:10.0pt"><o:p> </o:p></span></p>
<p><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> _nicholas</span><span style="font-size:10.0pt"><o:p></o:p></span></p>
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<br>
-- <br>
Nicholas F. Polys, Ph.D.<br>
<br>
Director of Visual Computing <br>
Virginia Tech Research Computing <br>
<br>
Affiliate Professor<br>
Virginia Tech Department of Computer Science<o:p></o:p></p>
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