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<p class="MsoNormal"><span style="font-family:Consolas">Dear All,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas">I need to render a 3D grid which is horizontally structured but vertically unstructured (a corner-point grid with vertical pillars).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas">This is made of columns on a regular grid, each column is made up of a possibly different number of voxels whose Z coordinates are different from the neighboring columns. Voxels are displaced only in Z,
so their faces are always perfectly vertical and touch the adjacent columns. <o:p>
</o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-family:Consolas"> *-----*<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-family:Consolas">/ /|<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-family:Consolas">*-----* o-----o<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-family:Consolas">| |/ /|<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-family:Consolas">| o-----o |<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-family:Consolas">| | | |<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-family:Consolas">*-----* | o<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-family:Consolas">| | |/<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-family:Consolas">| o-----o<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-family:Consolas">| |/<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-family:Consolas">*-----*<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas">I am using vtkUnstructuredGrid with VTK_VOXEL cells to represent this. In each column I have (Nz+1)*4 points to represent the voxel edges, so that 4 points are shared between two vertically adjacent voxels.
I cannot share points laterally because the Z values are different.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas">My problem is that I get very bad surface rendering artifacts at the boundaries between two columns, probably because both faces are rendered (see attached screenshot).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas">The only way I could get the correct rendering is by using OSPray in Paraview, but it's very slow on my hardware.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Consolas"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-family:Consolas">Is vtkUnstructuredGrid the best way to do this?<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Consolas"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-family:Consolas">Is there a way to hint VTK that some faces are partially coincident, as to avoid double rendering?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas">I can provide code samples or data if needed.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas">Thank you for your help,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas">Best Regards<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas">Federico<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<p class="MsoNormal"><i><span lang="EN-GB" style="font-size:7.0pt;font-family:"Arial","sans-serif";
color:#6A737B;mso-ansi-language:EN-GB">This email and any accompanying attachments are confidential. If you received this email by mistake, please delete<br>
it from your system. Any review, disclosure, copying, distribution, or use of the email by others is strictly prohibited.<o:p></o:p></span></i></p>
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