L11 - Solid Modeling Data Structures GE101 Engineering...

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    Solid Modeling Data Structures GE101 Engineering Graphics and Design
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    Types of Solid Modelers Categorization based upon the way data is  stored in database   Constructive solid geometry (CSG)   Boundary representation (B-rep)  Hybrid of CSG and B-rep
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    Constructive Solid Geometry ( CSG ) Uses Boolean operations to create complex  solids from primitives Primitives, Boolean operations stored in  database Can make changes to primitives Tree structure    Range of shapes limited (only primitives and  Booleans) Since primitives stored (not surface boundaries),  must recalculate model each time it is shaded Calculation of NC tool paths for machining is a  problem (surface info required)
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    CSG Tree Structure Tree structure  represents model  history Shows which  primitives (leaves)  and operations  (nodes) were used,  and their order
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    Boundary Representation Modeling ( B-rep )
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