Object models for computer aided design

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3 Epec􁪽􋵦fed ex;lic􁪽􋵴tly 􁪽􋵮n terrrs ef the 􁪽􋵯odel an􁪽􋵴 the pro􁪽􋴚􁪽􋵡arrs 􁪽􋵣c 􁪽􋴚􁪽􋴻;lErrent these o;erat􁪽􋵯ons ea􁪽􋵢 be 􁪽􋵲r􁪽􋴺:ten. The p􁪽􋵲rpose of the research reported in th:s tr.es􁪽􋵳s 􁪽􋵡as been to develop en underlying 􁪽􋵯o􁪽􋵥e!􁪽􋵮ng systerr 􁪽􋴚􁪽􋵩ich 􁪽􋵯o􁪽􋵬ld serve as a suitable base for su􁪽􋵰portir.? aF􁪽􋵬licat􁪽􋵯ons 􁪽􋵮n engineering design and scient􁪽􋵦fic analysis; In order to ?:ve substance to this context, we will br􁪽􋵥efly consider the exarrple of a 􁪽􋵩ine design system. It was, in fact, t􁪽􋵥e experience of developing this syste􁪽􋵯 over the last several intervals (e.g. 10 feet). The traditional method of years that has rrotivated and tempered these ideas. 1.3 The Mining Problem The first problem in underground rr.ining 1S to determine the extent and grade ef the ore body. In order to 􁪽􋵡ax􁪽􋵲rrize 􁪽􋴚􁪽􋵯of:ts, one must 􁪽􋵩ine in t􁪽􋵥e ri?􁪽􋵴t places. In order to obtain 􁪽􋵮nfor􁪽􋵡ation for this Furpose, exploratory holes are drilled through the ore body frorr. various places on the surface and under?round (see fi?ure 1.1). The cores from these drill holes are then assayed at regLllar interpret􁪽􋵮n􁪽􋵴 the ore body be?ins by rranually plotting these crill holes en drawings which represent planar sections through the ore bocy (e.g. every 50 feet). Since the drill holes are neither straight, nor confined to the planes of