How to update geometry using External Visualizer?

[Aryan-Satpathy]

Checklist

• [X] I have searched for similar issues.
• [X] For Python issues, I have tested with the latest development wheel.
• [X] I have checked the release documentation and the latest documentation (for main branch).

My Question

I am using open3d's External Visualizer to visualize point clouds in a remote pc (unfortunately, X forwarding is not allowed). Currently, I have a script in the remote server that draws the point cloud: draw = o3d.visualization.ExternalVisualizer(timeout=timeout).draw and draw(pcl), and on my pc I run python3 -m open3d.visualization --external-vis. However, when I want to view another pointcloud, I have to close the current visualization in my pc and restart it (python3 -m open3d.visualization --external-vis) which is cumbersome when repeating (I am using it to view progress in my training).

I was wondering if there was a better way to do it, perhaps something similar to update_geometry: o3d.visualization.Visualizer.update_geometry() or some way to clear geometries within the renderer gui?

I would be happy to provide more information if that's necessary. Here is some basic info: open3d version in both remote server and local system is 0.18.0.