How do you make walls on @pumpkinhead's 3d engine

ik its the second time i ask this and that his engine is kinda old but i just wanna know so @pumpkinhead or anyone else that knows how to do this please tell me

it’s only a 3d rendering engine, so it doesn’t have physics. you’ll have to program 3d physics on your own.

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oh well too bad then cause idk advanced coding