Loading a 3D object to the Env

[jerrykeung666]

Is your feature request related to a problem? Please describe.
I am lost at loading a 3D object file (.obj file, the object to be manipulated) into Nimble.

Describe the solution you'd like
The description of relevant API or pointers/instructions to the solution.

Describe alternatives you've considered
I have checked the code and document, but I failed to find one.

Additional context
NA.