><a class="header" href="#extract-shapes-1">Extract Shapes</a></h1>
<p>Once we apply boolean filter to <a href="overlay/extract/../overlay_graph/overlay_graph.html">Overlay Graph</a>, we can begin extract contours.</p>
<h2 id="build-contour"><a class="header" href="#build-contour">Build Contour</a></h2>
<h3 id="outer-contour-1"><a class="header" href="#outer-contour-1">Outer Contour</a></h3>
<p><img src="overlay/extract/extract_outer_contour_clockwise.svg" alt="Extract Contour" /></p>
<h3 id="inner-contour"