make me an extremely logically and mechanically and visually simple single html code structure for 3D fire escape BIM simulator as 3d first person AAA game experience - explore efficient and light libraries make use of most of local stuff and implement some basic logic to it - maybe use metrics as score to make it as a scientific instrument of a sort - to perform case studies in VR - very light be resourceful with code with want simplicity and getting more experience from least code possible - smoke escape procedural labyrinth can be a more specific version of same idea - maybe split the simulation in different types of experience testing - fire x smoke (as visual) - smoke as breathing - fire equipment use - different modes maybe