title: MeshLab : How to achieve the information of each component
body: <p><strong>What am I going to do?</strong></p>
  
  <p>I have a stl file which has two connected components.</p>
  
  <p><a href="https://i.stack.imgur.com/TH25W.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/TH25W.jpg" alt="img1"></a></p>
  
  <p>I am trying to calculate the volume, surface and curvatures of each component.</p>
  
  <p><strong>What's my question?</strong></p>
  
  <ol>
  <li><p>How to identify which vertices or facets belong to each component?
  I noticed MeshLab can identify the number of components, which seems each component has a ID. Hence, the vertices and facets should be related to each component(ID).</p></li>
  <li><p>How to calculate the volume and surface of each component?
  The filter "Compute Geometric Measures" can calculate the whole volume, but how to calculate the volume of each component?</p></li>
  </ol>
  
  <p>Thanks for your help.</p>
  
  <p>Brian</p>