section_polygons" class="anchor"></a><code><span><span class="keyword">val</span> intersection_polygons : <span><a href="#type-t">t</a> <span class="arrow">&#45;&gt;</span></span> <span><a href="#type-t">t</a> <span class="arrow">&#45;&gt;</span></span> <span><a href="#type-t">t</a> list</span></span></code></div><div class="spec-doc"><p>Implementation of Weiler Atherton Algorithm for concave/convexe polygons clipping. Complexity is O(m*n).</p></div></div><div class="odoc-spec"><div class="spec value" id="v