What is the name of the sub-field within spacial Data Science where the data relates in some way to physical objects viewed as 3D (graphics) Models?
There are many possible answers to this question.
Data science applied to mechatronics and cybernetics can involve physical information, which I believe is what you are describing. The DS side of mechatronics often involves IoT and engineering cybernetics principles. More specific sub-fields include design optimization and control theory.
Edit to add a few more examples:

Fault detection
Anomaly Detection
Simulations

Monte Carlo


Modeling and Simulation