title: Why is Meshlab identifying self-intersecting faces incorrectly?
body: <p><a href="/questions/tagged/meshlab" class="post-tag" title="show questions tagged &#39;meshlab&#39;" rel="tag">meshlab</a> occassionally finds spurious self-intersections that don't seem to be correct - see this minimal example of just <a href="https://drive.google.com/open?id=1lg00B9hx0abekV-F4TUg8ogU70T2Cd6r" rel="nofollow noreferrer">two faces</a>. <a href="/questions/tagged/meshlab" class="post-tag" title="show questions tagged &#39;meshlab&#39;" rel="tag">meshlab</a> identifies the faces as self-intersecting. If I save the file as an ascii <a href="/questions/tagged/stl" class="post-tag" title="show questions tagged &#39;stl&#39;" rel="tag">stl</a>, the file no longer shows to be self-intersecting. </p>
  
  <p>I've checked the binary content of the binary file to see if there are non-displayed triangles in case zero-area triangles are simply not shown but there don't seem to be.</p>