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5장전체-old - 1 Introduction An interactive computer...

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1. Introduction ; An interactive computer graphic system used to design complete 3-D parts and assembly Model : data file storing geometric model of parts or assemblies. Modeler : Software which accepts a designer's command and creates or modify the models. - Wire frame modeler - Surface modeler - Solid modeler - Non manifold modeling system Application s/w - mass property calculation - F.E.M preprocessor, postprocessor - NC command generation - interference checking Geometry & topology - Geometry : information containing shape defining parameters, such as the coordinate of vertices. 일일일일일 일일(boundary)일 일일 일일일 일일일 일일 일일. - Topology : connectivity information between geometric components.
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Geometric entities Topological entities point vertex curve edge surface face edge Curve/line
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2. Geometric modeling system 1) Wire frame modeling system ; 일일일일 일일 일일 일일일 일일. 일일> 일일 일일, 일일일 일일일일 list + connectivity information 일일> - 일일일 일일, 일일일 일일 일일. - ambiguous - 일일일 일일, 일일일 일일 일일일 일일. --> No hidden surface removal --> No shaded image --> No mass property --> No NC path generation --> No mesh generation 2) Surface modeling system 일일> wire frame model + list of surface information + (surface connectivity) face 일 일일일 일일일. 일일일 일일일일 일일 - point set - curve net - curve 일 일일 -> 일일 일일 일일 - 일일일 일일일 일일 - 일일일일일 일일 NC tool path generation
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dangling face dangling e dge 3) Solid modeling system 일일> surface model + topology information 일일일 일일 일일일일 일일일 일일/일일 일일일 일일 일일 -> 일일 일일일 일일일 일일 일일 - Mass property - FEM solid mesh generation - 일일일일 일 일일일 일일 -> 일일 일일 일일일 일일 일일 일일 - 일일일 일일일 modeling - 일일 일일일 일일 --> 일일 ==> lifting, sweeping, swinging, Boolean rounding 일일 일일 일일. solid model : mathematical model of objects in real world that satisfy following properties. - Bounded : geometric enclosure - homogeneously 3-dimensional : boundary is always in contact with the interior - finite : finite in size.
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3. Solid model 생생 생생 - CSG : primitive + Boolean operation - Moving surface : Sweeping (Sweeing) & Skinning - Modifying : Rounding & lifting - Boundary Representation (B-Rep) - Feature Based Modeling - Parametric Modeling - Spatial enumeration 1) CSG (Constructive Solid Geometry) modeling approach ; define complex solid as composition of simpler solid (primitives) using Boolean operation.
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