Setting 3D for a movie is all about adequately squeezing the real world inside the 3D screen space. That screen space is created by the interaction of the 2D screen and our eyes, and can be somewhat transformed using very specific visual effects.
HOW THE CAMERA SETUP CONTROLS THE 3D EFFECT
Interocular distance
The distance between the cameras is the single most important parameter in ste- reoscopy. It will regulate the strength of the 3D effect. Pull the cameras apart and your subject will grow. Push the cameras together and it will shrink. Setting this value is an artistic and technical decision linked to lens choice, desired 3D effect, ...
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