title: Closest distance + vertices of two meshes
body: <p>I would like to find two vertices of two meshes (1 vertex per mesh) that define the closest distance between them. Or the two triangles would be fine I guess.</p>
  
  <p>However I'm not sure how to search for this in CGAL's documentation, I'm sure that this is doable with some existing tool (probably based on a 3d distance field and/or AABBs). Could I please get a hint (keywords/link) on what to look for?</p>
  
  <p>I've been pointed to the <a href="http://doc.cgal.org/latest/Polytope_distance_d/group__PkgOptimalDistances.html" rel="nofollow">Optimal Distances</a> CGAL package, but it's not exactly what I want, since it outputs the distance and the coordinates, so finding the vertex ID is an additional computational overhead.</p>
  
  <p>I've already implemented a collision detection with CGAL to find the triangle-triangle intersection in a triangle-soup, using AABB-trees. I guess that I should be somehow close to this, although now a simple soup with all me object-triangles wouldn't do the job.</p>