Operation of a computer system is enhanced by means of a three-dimensional tactile control unit interactively coupled by a software package to the computer. By means of a sticklike mechanism, which is mechanically controlled by a servomotor system and energized by computer-generated signals proportional to a stored definition of a three-dimensional object, the hand of an operator is restrained to move over the surface of the object. Hence, surfaces of a three-dimensional object, otherwise virtually impossible to display, may be "felt" by the operator.
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