I had similar issue with 3d code in threejs. Models used to be quite bad over a year ago. got ok around year ago. the latest are quite good at it.

so i made a simple ab testing eval on fixed prompts: https://threejseval.com

There is a 7 degree o freedom robot arm that is really telling of the improvements in coordinates reasoning:

https://threejseval.com/gallery?eval=robot-arm