How to access an already rendered object?

Development
,
1

Operating system: window 11
Slicer version: 4.13.0

Hi, all

Which function should be referenced to access the object in the image rendered on the 3D sclier?

I’m planning a Python extension module, and I want to know the internal function to access information about a specific object (.ply) that has already been rendered on the 3D slicer.