<div dir="ltr"><div><span style="font-size:12.8px">Sébastien,</span><br></div><div><br></div><div>This looks like a classic case of z-fighting [1].</div><div><br></div><div>One solution is to offset one of the surfaces by a small amount in z.</div><div><br></div><div>Cory</div><div><br></div><div>[1] <a href="https://en.wikipedia.org/wiki/Z-fighting">https://en.wikipedia.org/wiki/Z-fighting</a></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Sep 25, 2015 at 6:09 AM, PULVERAIL, Sebastien <span dir="ltr"><<a href="mailto:sebastien.pulverail@sogeti.com" target="_blank">sebastien.pulverail@sogeti.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal">Hi there,<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">I am facing an issue that I don’t know how to solve.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">I build my own application based on Paraview just to read my simulation files.<u></u><u></u></p>
<p class="MsoNormal">A simulation is based on three files :<u></u><u></u></p>
<p><u></u><span>-<span style="font:7.0pt "Times New Roman"">
</span></span><u></u>File 1 = list of points + list of cells + extra information,<u></u><u></u></p>
<p><u></u><span>-<span style="font:7.0pt "Times New Roman"">
</span></span><u></u>File 2 = something we called extraction points (an extraction point is based on the points of my model but the associated cells are not necessarily the same as the model ones),<u></u><u></u></p>
<p><u></u><span>-<span style="font:7.0pt "Times New Roman"">
</span></span><u></u>File 3 = extra point data.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Let’s take a very simple example to explain the encountered problem.<u></u><u></u></p>
<p class="MsoNormal">The considered model has only four points and a single cell (a quad basically).<u></u><u></u></p>
<p class="MsoNormal">The extraction point is a triangle cell using the bottom-left point, so half of the quad is in the extraction point.<u></u><u></u></p>
<p class="MsoNormal">As the points are the same in the model and the extraction points, the two cells are superimposed.<u></u><u></u></p>
<p class="MsoNormal">If we consider that the model is colored with default color and the extraction point is colored with blue, the rendering won’t be as expected : it is kind of hatched rendering.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Click on this link <a href="http://imgur.com/7WCxHAz" target="_blank">http://imgur.com/7WCxHAz</a> to see a screenshot illustrating the problem on a more complicated example.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Thank you for your help.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Sébastien<span lang="FR" style="font-size:8.0pt;font-family:"Verdana","sans-serif";color:gray"><u></u><u></u></span></p>
<p class="MsoNormal"><u></u> <u></u></p>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature">Cory Quammen<br>R&D Engineer<br>Kitware, Inc.</div>
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