Object models for computer aided design

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59 f􁪽􋵥elds 􁪽􋵡ay be 􁪽􋵡a􁪽􋴚􁪽􋴚􁪽􋴚􁪽􋵬lated. For exarr.r:le, the ore reserves "c:tribute", anc "field" as r arre s c f c a t a s t r uc t u r e s r a c r.e r 􁪽􋵮n the fcl:c􁪽􋵩in; sectic􁪽􋵳s :hese str􁪽􋵣cture5 􁪽􋵩ill be 􁪽􋵯orrrally defined. In creer tc 􁪽􋵡ain a􁪽􋵩 intui:ive fee: for the flavor of the 5che􁪽􋵥e to rr.ake this fcr􁪽􋵡al defi􁪽􋵩itic􁪽􋴸 80re 􁪽􋵡alatatle, :he reaoer may wa􁪽􋵴t :0 refer to fig􁪽􋵲re 􁪽􋴮.l 􁪽􋵴tich shows a ·sc􁪽􋵥erratic diagrarr cf a􁪽􋵯 object 􁪽􋵨hich rri9h: be The rr.o6el is defined by specifyin9 the fcr􁪽􋵯 of the ctjects, attribctes, 2nc fields. The access and update 􁪽􋵵unctio􁪽􋵳s are 2t the object level. Once an object has been traGsferred to the prograrr 􁪽􋵯orkspace, the attributes and 􁪽􋴺:c;rarr considered in the first chapter rright perform the 1. invcke :􁪽􋵥e defin:tions of excavation, drill hole, and ere body cbj@cts, 2. 􁪽􋵣ccess the excavation object, ore body o􁪽􋵪jects for those ?crtions of the ore body which intersect the excavatior., and the drill hole objects for drill holes in the vicinity of the excava:ion, 􁪽􋴮. calc􁪽􋵬la':.e the reserves for the excavation and store therr as an attribute of the excavation object, 􁪽􋴮. u􁪽􋴶6ate the excavat:cr. Object.