As Autodesk's flagship product, by March 1986 AutoCAD had become the most ubiquitous microcomputer design program worldwide, with functions such as "polylines" and "curve fitting".
The user can interactively segment 3D entities (with a 2D polyline drawn on screen), interactively rotate/translate one ore several entities relatively to the others, interactively pick single points or couples of points (to get the corresponding segment length) or triplets of points (to get the corresponding angle and plane normal).
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