adding a set of axes to a SelectionPolygonVolume

[runra]

Hi All

It is pretty easy to add some axes or other primitives to a render
of a point cloud, using o3d.visualization.draw_geometries:
https://www.open3d.org/docs/latest/tutorial/visualization/visualization.html#Geometry-primitives

However, if I need to use a open3d.visualization.SelectionPolygonVolume object....
how do I display a set of axes centered at the origin?

Thanks