Transcription of 5 Geometric Modeling.ppt - UVic.ca
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Geometric ModelingIntroduction Geometric modelingis as important to CAD as governing equilibrium equations to classical iifildhi dth lengineering fields as mechanics and thermal fluids. 9intelligent decision on the types of entities necessary9intelligent decision on the types of entities necessary to use in a particular model to meet certain Geometric requirements such as slopes and/or of unexpected results9evaluations of CAD/CAM systems9innovative use of the tools in particular applications9innovative use of the tools in particular of new attributes, or modify the obtained models to benefit new engineering of terminology The Role of Geometric modeling in aThe Role of Geometric modeling in a CAD SystemComputerDisplayMathematicalreprese ntation(Database)UserInterfaceDrawingGen erationGeometricGenerationAli dDetermineDetermineModelingTechniqueAnal ysis andManufacturingGeneral RequirementsGeneral Requirements Complete part representation includingtopologicalComplete part representation including topological and geometricaldata Geometry: shape and dimensions Topology: the connectivity and associativityof the object entities; it determines the relational information between object
• In 3D wireframe model , an object is not recorded as a solid. ... • Sweeping of a 2D crossof a 2D cross-section in the form ofsection in the form of extrusion and revolving are used to define the 3D shape (for ... • The modeling approach uses sweeping to form the main shape of the part,
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