Abstract
SUMMARY A system which allows the computer to capture sketches made by a mechanical designer is described. The system not only recognizes basic design features as they are sketched, but it also builds a feature-based solid model of the artifact. The temporal nature of the capture, one feature at a time, serves to form a feature graph that allows for parametric redesign. The system is composed of three inference systems: a two-dimensional freehand primitive recognition system, a three-dimensional feature recognition system and a spatial reasoning system. Each is described in the paper.
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