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I am working on a simulator to project a realistically scaled object onto the screen. Eg. The person stands 3.8 M away from the screen, so a 1 meter cube placed 3.8M in front of the camera should measure out to be 1M on the projector screen.
Is there any formula I can use to prove that the perspective is properly scaling, eg. If I move the object back to 4M from the camera I can use a formula to prove that it is the proper scaling to the human eye?