<div dir="ltr">Matthew, <div><br></div><div>* Can you send us the exact number you are putting in for the transfer function? Make sure that you have values for the entire range of scalar values? </div><div><br></div><div>* Are you using OpenGL2 version? </div><div><br></div><div>- Aashish</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Sep 23, 2015 at 1:18 PM, Mathew Guilfoyle <span dir="ltr"><<a href="mailto:mrguilfoyle@gmail.com" target="_blank">mrguilfoyle@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word">Thanks for the suggestions. After looking into it further the type of visualisation I am after is volume rendering of the data with an opacity transfer function based on the scalar data values.<div><br></div><div>I have set up my volume rendering to have full (i.e =1) opacity through the range of scalar values I’m interested in, reducing to near transparency either side of this. I also want specular highlighting of the opaque tissues.</div><div><br></div><div>However, despite these settings Paraview does not seem to render any voxels as fully opaque and there is certainly no specular highlighting. Is this a known limitation?</div><div><br></div><div>Many thanks<br><div><blockquote type="cite"><div>On 21 Sep 2015, at 15:10, David E DeMarle <<a href="mailto:dave.demarle@kitware.com" target="_blank">dave.demarle@kitware.com</a>> wrote:</div><br><div><div dir="ltr">Two suggestions:<div>* try contour filter instead of threshold if contour isn't available, apply cell to point first.</div><div>* try the clip filter with the clip type set to scalar.</div><div>hth</div></div><div class="gmail_extra"><br clear="all"><div><div>David E DeMarle<br>Kitware, Inc.<br>R&D Engineer<br>21 Corporate Drive<br>Clifton Park, NY 12065-8662<br>Phone: <a href="tel:518-881-4909" value="+15188814909" target="_blank">518-881-4909</a></div></div>
<br><div class="gmail_quote">On Mon, Sep 21, 2015 at 9:40 AM, Mathew Guilfoyle <span dir="ltr"><<a href="mailto:mrguilfoyle@gmail.com" target="_blank">mrguilfoyle@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I would be grateful for some advice on volume and surface rendering in Paraview.<br>
<br>
I am trying to generate 3D skull models from CT data. The reason for using Paraview is to take advantage of the detailed fly-through/movie capability. I can generate an acceptable 3D model that I can interact with in OsiriX and 3D Slicer, both of which I believe use VTK. However, in Paraview I am struggling to create a 3D model that looks any good.<br>
<br>
When I apply a threshold filter and view as a ‘Surface’ the image is a lot more ‘blocky’ than in the other two applications. The image is dominated by the artifactual lines due to the original data being acquired as axial slices; whereas in OsiriX and 3D Slicer this gets smoothed out and the ‘genuine’ surface skull features (sutures etc) stand out.<br>
<br>
I realise this is probably question of apply the correct series of filters and that the other two apps do this ‘under the hood’. However, i have tried to apply Decimation and Smooth to the extracted surface and am not making any headway.<br>
<br>
Any pointers would be very welcome<br>
<br>
M<br>
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<br></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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