In orthographic camera mode, a model displays so that all of its points project along lines parallel to their positions on the screen. All same-length parallel edges display as the same length, even when you orient them with one edge closer to you than the other. In orthographic camera mode, a 3D model appears flat and unlike objects observed in the real world.
Note: The term camera mode indicates only the particular view method used for models in the graphics window. You cannot record actions that take place in the graphics window by choosing either orthographic camera mode or perspective camera mode.