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<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy">Hello Cris and all,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy">Apparently X3DOM is having problems rendering large non-convex polygons, even if convex=“false”. Try triangulating the red polygon or separating it
into smaller pieces.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy">A note to X3DOM developers. In the source code I have found the following line:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;font-family:"Lucida Console";color:navy">while(linklist.length >= 3 && count < 15) {<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy">Apparently the “15” was added to avoid infinite recursion. In fact, it is limiting the number of “ears” clipped from the non-convex polygon. If a polygon
is too complex, the algorithm tessellates a number of “ears” and then stops, leaving the remaining “ears” and the interior of the polygon empty. Increasing this value to 30 renders Cris’s polygon correctly. Anyway, I think it’s not a good solution because
the polygons can have arbitrary complexity. Probably a different mechanism of detecting infinite recursion should be used?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy"><o:p> </o:p></span></p>
<p class="MsoNormal" align="right" style="text-align:right"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy"> Sergey Bederov<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> x3d-public [mailto:x3d-public-bounces@web3d.org]
<b>On Behalf Of </b>Roy Walmsley<br>
<b>Sent:</b> Wednesday, December 02, 2015 6:23 PM<br>
<b>To:</b> 'Cris Lacumba'; 'x3dom mlist'; x3d-public@web3d.org<br>
<b>Subject:</b> Re: [x3d-public] 3D wrong visualization<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Cris,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I don’t know the answer, but I can suggest some questions.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Are your polygons being drawn on both sides? When you look at the X3DOM visualization, are the polygons being drawn on the other side?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">How are you specifying the polygons in your model? Are you able to supply a listing of the model?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Roy<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> x3d-public [mailto:x3d-public-bounces@web3d.org]
<b>On Behalf Of </b>Cris Lacumba<br>
<b>Sent:</b> 02 December 2015 11:44<br>
<b>To:</b> x3dom mlist; x3d-public@web3d.org<br>
<b>Subject:</b> [x3d-public] 3D wrong visualization<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-GB">Hi all,<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-GB">I'm visualizing some polygons in X3DOM and they are not correctly visualized.<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-GB">In InstantReality (black background) is correctly visualized, however, in X3DOM I get an incorrect visualization.<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-GB">Is there some solution?<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-GB">Thanks in advance<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-GB">Best regards <o:p></o:p></span></p>
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</span><img width="517" height="530" id="Picture_x0020_1" src="cid:image001.jpg@01D12E8F.D875B9D0" alt="Imágenes integradas 1"><img width="397" height="530" id="Picture_x0020_2" src="cid:image002.jpg@01D12E8F.D875B9D0" alt="Imágenes integradas 2"><span lang="EN-GB"><o:p></o:p></span></p>
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