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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Edge loop</span></span>
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<p>An <b>edge loop</b>, in <a href="Computer_graphics" title="Computer graphics">computer graphics</a>, can loosely be defined as a set of connected edges across a <a href="Computer_representation_of_surfaces" title="Computer representation of surfaces">surface</a>. (More specifically, the edges can form an <b>edge ring</b> and be one side of a <b><a href="Face_(geometry)" title="Face (geometry)">face</a> loop</b>.) Usually, the last edge meets again with the first edge, thus forming a loop. The set or string of edges can, for example, be the outer edges of a flat surface or the edges surrounding a 'hole' in a surface.
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<p>In a stricter sense, an edge loop is defined as a set of edges where the loop follows the middle edge in every 'four way junction'.<sup id="cite_ref-CG_Society_1-0" class="reference"><a href="#cite_note-CG_Society-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> The loop will end when it encounters another type of junction (three or five way, for example). Take an edge on a mesh surface for example, say at one end of the edge it connects with three other edges, making a four way junction. If you follow the middle 'road' each time, you would either end up with a completed loop or the edge loop would end at another type of junction.
</p><p>Edge loops are especially practical in <a href="Life" title="Life">organic</a> models which need to be animated. In organic modeling, edge loops play a vital role in proper deformation of the mesh.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> A properly modeled mesh will take into careful consideration the placement and termination of these edge loops. Generally, edge loops follow the structure and contour of the muscles that they mimic. For example, in modeling a human face, edge loops should follow the <a href="Orbicularis_oculi_muscle" title="Orbicularis oculi muscle">orbicularis oculi muscle</a> around the eyes and the <a href="Orbicularis_oris_muscle" title="Orbicularis oris muscle">orbicularis oris muscle</a> around the mouth. The hope is that by mimicking the way the muscles are formed, they also aid in the way the muscles are deformed by way of contractions and expansions. An edge loop closely mimics how real muscles work, and if built correctly, provides control over contour and silhouette in any position.
</p><p>"Edge loop" was first coined as a modelling term in 1999 by <a href="3D_printing" title="3D printing">3D</a> artist <a href="Bay_Raitt" title="Bay Raitt">Bay Raitt</a>, in an article called <i>Digital sculpting techniques</i> for <i>3D Design</i> magazine.
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<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>
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<li id="cite_note-CG_Society-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-CG_Society_1-0">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">
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</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20110324081434/http://wiki.cgsociety.org/index.php/Edge_Loop">"Edge Loop"</a>. <i>CG Society</i>. Archived from <a rel="nofollow" class="external text" href="http://wiki.cgsociety.org/index.php/Edge_Loop">the original</a> on 2011-03-24<span class="reference-accessdate">. Retrieved <span class="nowrap">2017-07-04</span></span>.</cite></span>
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<li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://zoomy.net/2008/04/02/modeling-with-edge-loops/">Modeling With Edge Loops</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20150426033233/http://zoomy.net/2008/04/02/modeling-with-edge-loops/">Archived</a> 2015-04-26 at the <a href="Wayback_Machine" title="Wayback Machine">Wayback Machine</a>, <i>Zoomy.net</i></span>
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<div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2></div>
<ul><li><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.theminters.com/misc/articles/derived-surfaces/derived-surfaces.pdf">"First appearance of Edge loops in an 3D world magazine article 'Digital Sculpting techniques'"</a> <span class="cs1-format">(PDF)</span>. <i>Bay Raitt</i>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20170516170023/http://www.theminters.com/misc/articles/derived-surfaces/derived-surfaces.pdf">Archived</a> <span class="cs1-format">(PDF)</span> from the original on 2017-05-16<span class="reference-accessdate">. Retrieved <span class="nowrap">2017-04-16</span></span>.</cite></li>
<li><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20110324081434/http://wiki.cgsociety.org/index.php/Edge_Loop">"Edge Loop"</a>. <i>CG Society</i>. Archived from <a rel="nofollow" class="external text" href="http://wiki.cgsociety.org/index.php/Edge_Loop">the original</a> on 2011-03-24<span class="reference-accessdate">. Retrieved <span class="nowrap">2017-07-04</span></span>.</cite></li>
<li><a rel="nofollow" class="external autonumber" href="https://web.archive.org/web/20160218133259/https://www.ualberta.ca/~cwant/blender/derived-surfaces.pdf">[1]</a>, <i>Another Description from 2000</i></li></ul>
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