Its all relative. If you model all at 1/10 of their size it will look real. Same goes if you double everything's size. It starts to look of if you model for example the plane at 1/10th of its size and the airfield at twice it`s size. Of course its not only about the models but for example the height of the player`s camera…
Work in real size Units. Set your Units to CM Character Height is usually approx 6ft. 6ft = 182.88cm Model everything in accordance to this scale. You know for example, if something is "waist height" itll be 3-4 foot high. If a rooms ceiling is 12ft or 2 people high, then work out a 2 storey building to be 24/25ft with…
By Bluerays I think you mean blue prints. Games do not model to Cm precision on anything really its more like an approx scale and with cars and planes, its merely finding out the size of the car and working around it. A quick example. I want to create a small plane, I research and find its size is 10M by 3M. I make a box…