Abstract
GEMS is a solid modelling system running on CAD workstation or 32 bits microcomputer with graphics terminal. Complex solid objects are built from transformation and set operations upon box, cylinder, cone, sphere, torus, sweeping object and other primitives. CEMS has explicit features, e. g. hierarchical modular structure, interactive user interface, intuitional input, screen menu driven by data table, defining and instancing object in network construction, storage bases on CSG (Constructive Solid Geometry) and BReps (Boundary Representations), regularized set operations, transformation pipeline consistent with PHIGS graphics standard, various transformations, cutting object with two sections in arbitrary angle, patrolling to view the inside of an object, mapping patterns onto surfaces of an object etc.. Not only can it be used for the fields of spatial planning, architectural plan, CAD/CAM for machining, structure analysis, but it is also fundamental for developing the practical system of simulation, computer vision, robotics and so on.
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