<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">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 class=""><br class=""></div><div class="">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 class=""><br class=""></div><div class="">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 class=""><br class=""></div><div class="">Many thanks<br class=""><div><blockquote type="cite" class=""><div class="">On 21 Sep 2015, at 15:10, David E DeMarle <<a href="mailto:dave.demarle@kitware.com" class="">dave.demarle@kitware.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class="">Two suggestions:<div class="">* try contour filter instead of threshold if contour isn't available, apply cell to point first.</div><div class="">* try the clip filter with the clip type set to scalar.</div><div class="">hth</div></div><div class="gmail_extra"><br clear="all" class=""><div class=""><div class="gmail_signature">David E DeMarle<br class="">Kitware, Inc.<br class="">R&D Engineer<br class="">21 Corporate Drive<br class="">Clifton Park, NY 12065-8662<br class="">Phone: 518-881-4909</div></div>
<br class=""><div class="gmail_quote">On Mon, Sep 21, 2015 at 9:40 AM, Mathew Guilfoyle <span dir="ltr" class=""><<a href="mailto:mrguilfoyle@gmail.com" target="_blank" class="">mrguilfoyle@gmail.com</a>></span> wrote:<br class=""><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 class="">
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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 class="">
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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 class="">
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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 class="">
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Any pointers would be very welcome<br class="">
<br class="">
M<br class="">
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