assets/mjcf/billiard.xml

<?xml version="1.0" ?>
<mujoco model="billiard">
  <asset>
    <mesh name="mesh_billiard" file="../obj/billiard.obj"/>
  </asset>
  <worldbody>
    <body name="billiard">
      <geom name="billiard_geom" type="mesh" mesh="mesh_billiard"/>
    </body>
  </worldbody>
</mujoco>