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<li class="toctree-l1 current"><a class="current reference internal" href="#">Convention</a><ul>
<li class="toctree-l2"><a class="reference internal" href="#okada-vs-poly3d">Okada vs Poly3D</a></li>
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<section id="convention">
<h1>Convention<a class="headerlink" href="#convention" title="Link to this heading"></a></h1>
<section id="okada-vs-poly3d">
<h2>Okada vs Poly3D<a class="headerlink" href="#okada-vs-poly3d" title="Link to this heading"></a></h2>
<p>As opposed to <a class="reference external" href="https://en.wikipedia.org/wiki/David_D._Pollard">Poly3D</a>, we use the <a class="reference external" href="https://pubs.geoscienceworld.org/ssa/bssa/article-abstract/75/4/1135/118782/Surface-deformation-due-to-shear-and-tensile?redirectedFrom=fulltext">Okada</a> convention where x-axis represents the normal
direction of a triangular element, the y-axis the strike direction and the z-axis the dip-direction
pointing upward for positive value:</p>
<img alt="_images/convention.png" src="_images/convention.png" />
<p>As the convention is related to the triangular elements making the discontinuities,
and specifically the displacement discontinuity also called <strong>Burger</strong> vector, you can
switch from <strong>Okada</strong> to <strong>Poly3D</strong> (or any convention of your choise) by using the
<a class="reference internal" href="api/burger_filter.html#burgerfilter"><span class="std std-ref">BurgerFilter</span></a> class. Here is an example of using the filter while gathering the
computed burger vectors from a surface discontinuity:</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="c1"># Switch to the Poly3D convention</span>
<span class="nb">filter</span> <span class="o">=</span> <span class="n">BurgerFilter</span><span class="p">()</span>
<span class="nb">filter</span><span class="o">.</span><span class="n">setAxisOrder</span><span class="p">([</span><span class="s1">'dip'</span><span class="p">,</span> <span class="s1">'strike'</span><span class="p">,</span> <span class="s1">'normal'</span><span class="p">])</span>
<span class="nb">filter</span><span class="o">.</span><span class="n">setAxisRevert</span><span class="p">([</span><span class="n">true</span><span class="p">,</span> <span class="n">false</span><span class="p">,</span> <span class="n">false</span><span class="p">])</span>
<span class="n">displ</span> <span class="o">=</span> <span class="nb">filter</span><span class="o">.</span><span class="n">apply</span><span class="p">(</span> <span class="n">surface</span><span class="o">.</span><span class="n">displ</span><span class="p">()</span> <span class="p">)</span>
</pre></div>
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</section>
<section id="engineer-vs-geologist">
<h2>Engineer vs geologist<a class="headerlink" href="#engineer-vs-geologist" title="Link to this heading"></a></h2>
<p>As opposed to <strong>Poly3D</strong> which is based on geologist convention (for which compression is positive),
we use the engineer convention, i.e., where compression is negatif.</p>
<p>Any positive value is extension, not compression. Therefore, a normal to a joint will be parallel
to the minimum compressive stress, i.e., the maximum eigen value <span class="math notranslate nohighlight">\(\sigma_1\)</span>, not the minimum <span class="math notranslate nohighlight">\(\sigma_3\)</span>
as in geologist convention.</p>
</section>
<section id="local-vs-global">
<h2>Local vs global<a class="headerlink" href="#local-vs-global" title="Link to this heading"></a></h2>
<p>For discontinuities, burger’s vectors are computed at triangle’s center and in triangle local
coordinate system.</p>
<p>However, when displaying (using OpenGl) iso-contours of Burgers on fault surfaces, this displacemment
field has to be defined <strong>at vertices</strong> and in <strong>local coordinate system</strong>.</p>
<p>Similarly, when displaying vector field on fault surfaces, this
displacemment field has to be defined at <strong>vertices</strong> and in <strong>glocal coordinate system</strong>.</p>
<p>This is why the object <a class="reference internal" href="api/postprocess.html#postprocess"><span class="std std-ref">Postprocess</span></a> provide the method <cite>burgers</cite> with 2 booblean parameters:</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="n">postprocess</span><span class="o">.</span><span class="n">burgers</span><span class="p">(</span><span class="n">local</span><span class="p">:</span> <span class="nb">bool</span><span class="p">,</span> <span class="n">atTriangles</span><span class="p">:</span> <span class="nb">bool</span><span class="p">)</span>
</pre></div>
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