Appeal No. 95-3378
Application No. 08/126,443
combined model;
generating at least one sectioned view of said solid object
as represented by said modified base model and said modified
sectioning object model.
The reference relied on by the examiner is:
Mortenson, “Geometric Modeling,” John Wiley & Sons, 1985, pages
431 through 480.
Claims 1 and 3 through 7 stand rejected under 35 U.S.C.
§ 103 as being unpatentable over Mortenson.
Reference is made to the briefs and the answer for the
respective positions of the appellants and the examiner.
OPINION
Mortenson discloses (page 461) constructive solid geometry
modeling methods that define complex solids as compositions of
simpler solids or primitives. Boolean operators are used to
execute the composition. “Constructive solid geometry
representations of objects are ordered binary trees whose leaf or
terminal nodes are either primitives or transformation data for
rigid-body motions” (page 462). “The most common approach in
contemporary modeling systems is to offer a finite set of
concise, compact primitives whose size, shape, position, and
orientation are determined by a small set of user-specified
parameters” (page 463). “The Boolean operators used by CSG
systems are the familiar threesome: union, difference, and
3
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