title: Meshlab - Get IDs of selected vertices
body: <p>I want to select a region of the mesh and get the IDs of the selected vertices, so that I can use them in my custom c++ processing pipeline. </p>
  
  <p>For example if there is a 3d hand mesh, one can choose the vertices that belong to every fingertip. Getting the IDs of these vertices is very useful for several applications, like tracking, annimating, etc. </p>
  
  <p>Meshlab obviously uses the IDs of these vertices under the hood, but can this info be exposed to the user? There are plenty of tutorials online about how to choose (in various ways) some region of a mesh and apply some processing function, but I didn't find something that talks about getting raw information about the selected area.</p>