title: instancedMesh: the vertex will lose precision
body: <p>Using THREE.InstantMesh, when the size of the geometry box is 2, and the position is placed at a distance of about 8000000 from the origin, the vertex will lose precision.
  <a href="https://i.stack.imgur.com/hxhoP.png" rel="nofollow noreferrer">lose precision</a>    <a href="https://i.stack.imgur.com/JFtF1.png" rel="nofollow noreferrer">normal</a></p>