<div dir="ltr"><span style="font-size:small;text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">Hi Folks,</span><div style="font-size:small;text-decoration-style:initial;text-decoration-color:initial"><br></div><div style="font-size:small;text-decoration-style:initial;text-decoration-color:initial">I have a 3D data of a scalar which is being advected & diffused. What I need is a volumetric representation/rendering of 3D data similar to the one attached(figure1 and figure2)[1] and [2].</div><div style="font-size:small;text-decoration-style:initial;text-decoration-color:initial"><br></div><div style="font-size:small;text-decoration-style:initial;text-decoration-color:initial">My system's 3D volume rendering is attached (figure3). What I am struggling with is to define the colormap such that the middle ranges become transparent. I hope that by doing this I can reproduce the same figure. </div><div style="font-size:small;text-decoration-style:initial;text-decoration-color:initial"><br></div><div style="font-size:small;text-decoration-style:initial;text-decoration-color:initial">What I have tried at first cut is to create a iso volume of the vtk file which happens to be a rectilinear grid and somehow i couldn't directly render it as a volume. After applying the IsoVolume filter, I apply color map opacity transfer function to make certain range as transparent. The output of this pipeline could be found in figure 4. Even after this the visualisation doesnt look as clean as I expected and it happens after applying the iso-volume filter.</div><div style="font-size:small;text-decoration-style:initial;text-decoration-color:initial"><br></div><div style="font-size:small;text-decoration-style:initial;text-decoration-color:initial">Is there some other way out. Any ideas on how to implement/produce this in Paraview. <br></div><div style="font-size:small;text-decoration-style:initial;text-decoration-color:initial"><br></div><div style="font-size:small;text-decoration-style:initial;text-decoration-color:initial">Attachments(removed): Due to size limitations I am sharing all the figures on this Imgur link  <a href="https://imgur.com/a/oQaJQr1">https://imgur.com/a/oQaJQr1</a> </div><div style="font-size:small;text-decoration-style:initial;text-decoration-color:initial"><br></div><div style="font-size:small;text-decoration-style:initial;text-decoration-color:initial">[1] <a href="http://www.pnas.org/content/pnas/113/1/69.full.pdf" target="_blank" style="color:rgb(17,85,204);text-decoration:none">http://www.pnas.org/content/pnas/113/1/69.full.pdf</a></div><div style="font-size:small;text-decoration-style:initial;text-decoration-color:initial">[2] <a href="https://arxiv.org/pdf/1605.04161.pdf" target="_blank" style="color:rgb(17,85,204);text-decoration:none">https://arxiv.org/pdf/1605.04161.pdf</a></div><br clear="all"><div><div dir="ltr" class="gmail_signature"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div style="margin:0px 0px 8px"><p style="font-family:Verdana,Arial,Helvetica,sans-serif;font-size:13.3px;margin:0px">---------------------------------</p><p style="font-family:Verdana,Arial,Helvetica,sans-serif;margin:0px">With thanks & regards<br></p><p style="margin:0px"><font face="Verdana, Arial, Helvetica, sans-serif" color="#0000ff"><b>Aniruddha<br></b></font></p></div></div></div></div></div></div></div>