Feature recognition from surface models of complicated parts is becoming increasingly important in the development of efficient computer-aided design (CAD) systems.

The article “A Computationally Efficient Approach to Feature Abstraction in Design-Manufacturing Integration”

(J. of Engr. for Industry, 1995: 16–27) contained a graph of log10(total recognition time), with time in sec, versus log10(number of edges of a part), from which the following representative values were read:

Log(edges) 1.1 1.5 1.7 1.9 2.0 2.1 Log(time) .30 .50 .55 .52 .85 .98 Log(edges) 2.2 2.3 2.7 2.8 3.0 3.3 Log(time) 1.10 1.00 1.18 1.45 1.65 1.84 Log(edges) 3.5 3.8 4.2 4.3 Log(time) 2.05 2.46 2.50 2.76