How to use an open source project like Kone Car Designer?

hi,

KONE Car Designer

I want to make a website where I can edit elevators with three js like the example on this site. however, I could not find such an open source in my research. What kind of research do I need to do in order to create such a project? What do I need to know?

Hi! How to hide wall when camera stay back, load models, change models, set mirror to floor, maybe how bake lightMap and ambientOcclusion or using postprocess for ambientOcclusion