>> It'd have to be a situation like sklearn and numpy where all the actual functionality is implemented in c/c++ and you're just using it as a glue language It

>> It'd have to be a situation like sklearn and numpy where all the actual functionality is implemented in c/c++ and you're just using it as a glue language It sounds like this engine is not implemented in 100% python. See also Panda3D https://www.panda3d.org/ https://www.panda3d.org/, which was used in commercial games back in the day, and is exactly what you are describing!