title: What's the simplest mesh file I can produce?
body: <p>I would like to set a mesh file on Qt
  <a href="https://doc.qt.io/qt-5/qcustom3ditem.html#meshFile-prop" rel="nofollow noreferrer">https://doc.qt.io/qt-5/qcustom3ditem.html#meshFile-prop</a>. The item in the file must be in Wavefront OBJ format and include vertices, normals, and UVs. It also needs to be in triangles.</p>
  
  <p>What's the simplest mesh file I can produce? By simple I mean one that will be cheap in cpu cycles to process. </p>
  
  <p>Should I use Blender to generate such a file? I did so and got the following:</p>
  
  <pre><code># Blender v2.80 (sub 75) OBJ File: ''
  # www.blender.org
  o Cube
  v 1.000000 1.000000 -1.000000
  v 1.000000 -1.000000 -1.000000
  v 1.000000 1.000000 1.000000
  v 1.000000 -1.000000 1.000000
  v -1.000000 1.000000 -1.000000
  v -1.000000 -1.000000 -1.000000
  v -1.000000 1.000000 1.000000
  v -1.000000 -1.000000 1.000000
  vt 0.625000 0.000000
  vt 0.375000 0.250000
  vt 0.375000 0.000000
  vt 0.625000 0.250000
  vt 0.375000 0.500000
  vt 0.375000 0.250000
  vt 0.625000 0.500000
  vt 0.375000 0.750000
  vt 0.625000 0.750000
  vt 0.375000 1.000000
  vt 0.375000 0.500000
  vt 0.125000 0.750000
  vt 0.125000 0.500000
  vt 0.875000 0.500000
  vt 0.625000 0.500000
  vt 0.625000 0.250000
  vt 0.625000 0.750000
  vt 0.625000 1.000000
  vt 0.375000 0.750000
  vt 0.875000 0.750000
  vn 0.0000 1.0000 0.0000
  vn 0.0000 0.0000 1.0000
  vn -1.0000 0.0000 0.0000
  vn 0.0000 -1.0000 0.0000
  vn 1.0000 0.0000 0.0000
  vn 0.0000 0.0000 -1.0000
  s off
  f 5/1/1 3/2/1 1/3/1
  f 3/4/2 8/5/2 4/6/2
  f 7/7/3 6/8/3 8/5/3
  f 2/9/4 8/10/4 6/8/4
  f 1/11/5 4/12/5 2/13/5
  f 5/14/6 2/9/6 6/15/6
  f 5/1/1 7/16/1 3/2/1
  f 3/4/2 7/7/2 8/5/2
  f 7/7/3 5/17/3 6/8/3
  f 2/9/4 4/18/4 8/10/4
  f 1/11/5 3/19/5 4/12/5
  f 5/14/6 1/20/6 2/9/6
  </code></pre>