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C00002 00002	3.0	GEOMETRIC MODELING THEORY.
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3.0	GEOMETRIC MODELING THEORY.
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3.1	Introduction to Geometric Modeling.
3.2	Time and Space.
3.3	Surface and Solid.
3.4	Polyhedron Representation.
3.5	Camera Modeling.
3.6	Light Modeling.
3.7	Image Prediction - Hidden Line Elimination.
3.8	Mechanical Simulation.
3.9	Semantic, Feature and Predicate Representations.
3.10	Related Modeling Work.
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	The  word  "geometry"  literally  means  earth  measure;  the
classical study  of geometry concerns the properties, measurement and
relationship of points, lines and  figures in space. The notion of  a
geometric model is hardly new;  geometric models were used 5000 years
ago   for  astronomy   and  engineering  by   the  earliest  Egyptian
civilization.

	The geometric world model has three roles: 


Assumption:	The vision world model should be three dimensional.

Assumption:	The vision world model should be able to represent:
			1. surfaces of opaque objects.