<div dir="ltr">Eugene,<div><br></div><div>I am pretty sure the community will be interested in this! While I'll need to look into the reader to understand, to get things going, do you have a sample dataset to demonstrate the issue?</div><div><br></div><div>Utkarsh </div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Jul 5, 2016 at 10:28 AM, Eugene de Villiers <span dir="ltr"><<a href="mailto:e.devilliers@engys.com" target="_blank">e.devilliers@engys.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"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Hi,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">When importing STL format geometry or similar, where connectivity information is not implicit in the data structure, it appears that the connectivity is reconstructed
via an octree search. This is very inefficient when surfaces with large differences in edge length are imported – we have had a recent case where an STL took 45mins to load. If the same input geometry is converted to OBJ format via an external tool, the load
time reduces to minutes.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">A generally more efficient method is to calculate the distance of each point from a location outside the point cloud bounding box and then to bubble-sort the
resulting list. Unless you are dealing with a pathological case your local search neighbourhood of identical distance points will be small and the algorithm very fast. More complex, multi-origin algorithms are also possible to counter pathological instances.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">I can provide more details and sample code if you are interested.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Best regards,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Eugene de Villiers<u></u><u></u></span></b></p>
<p class="MsoNormal"><i><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Managing Director<u></u><u></u></span></i></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><a href="mailto:e.devilliers@engys.com" target="_blank">e.devilliers@engys.com</a><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Mob: <a href="tel:%2B44%20%280%29%2077%2089748490" value="+447789748490" target="_blank">+44 (0) 77 89748490</a><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Tel: <a href="tel:%2B44%20%280%2920%2032393041" value="+442032393041" target="_blank">+44 (0)20 32393041</a> (ext. 102)<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Fax: <a href="tel:%2B44%20%280%2920%2033573123" value="+442033573123" target="_blank">+44 (0)20 33573123</a><u></u><u></u></span></p>
<p class="MsoNormal"><a href="http://www.engys.com/" target="_blank"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;text-decoration:none"><img border="0" width="136" height="30" src="cid:image001.png@01D1D6C9.FC475980" alt="logo_red-black_fonts_signature"></span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u><u></u></span></p>
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