title: How do I get the orientation from a open3d.geometry.OrientedBoundingBox?
body: <p>I've created a Oriented Bounding Box from a clustered sub point cloud of a Velodyne Lidar (rotating laser sensor). I want to get the orientation of the Bounding Box (preferable as a quaternion).</p>
  <pre><code>subpcd_o3d = o3d.utility.Vector3dVector(np.array(subpcd))
  o3d_bbox = o3d.geometry.OrientedBoundingBox.create_from_points(subpcd_o3d)
  </code></pre>
  <p>The Documentation has no such method: <a href="http://www.open3d.org/docs/latest/python_api/open3d.geometry.OrientedBoundingBox.html" rel="nofollow noreferrer">http://www.open3d.org/docs/latest/python_api/open3d.geometry.OrientedBoundingBox.html</a></p>
  <p>This is confusing. Why is there apparently no orientation of the oriented bounding box?</p>