title: How do you remove polygons from a pcl::PolygonMesh
body: <p>I would like to remove polygons from a polygon mesh using indices.
  For example i want something like this.</p>
  <pre><code>pcl::PolygonMesh randomMesh;
  int indecyOfUnwantedPolygons [] = {1,2,3,4};
  randomMesh[indecyOfUnwantedPolygon].remove(); // 
  </code></pre>