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Three-dimensional graphics means you are working with three dimensions; in other words, width, depth, and height. If you look around, everything you see is three-dimensional – the desk, the building, the chair, plants, and even your self. However, the term 3D graphics representantion of a virtual three-dimensional world.

When working with 3D Studio Max , you must remember that you are dealing with a virtual computer world, and as such, you must understand how objects are represented and stored in this world.
Understanding 3D Space