VPython hangs in Jupyter notebook inside VS Code

[ruboerner]

When running VPython inside a Jupyter notebook in VS Code, the code hangs indefinitely.

Minimal working example:

from vpython import *
sphere()

Expected behavior:
A 3D canvas should open and display a sphere.

Actual behavior:
The line with sphere() runs forever without producing output. No error message appears.

Environment:

• Python version: 3.12.6
• vpython version: 7.6.5
• jupyterlab-vpython extension version: 3.1.8
• OS: MacOS
• VS Code version: 1.103.2

Additional info:

• The same code works correctly when run as a standalone Python script in VS Code.
• The same code works in Jupyterlab outside of VS Code.