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  1 ©M. S. Ramaiah Universit of Alied Sciences Facult of Enineerin & Technolo Part Design Balappa.B.U  2 ©M. S. Ramaiah Universit of Alied Sciences Facult of Enineerin & Technolo Solid Modeling ã Solid Modeling is the unambiguous representation of the solid parts of an object ã computer can calculate many physical properties of these parts, such as center of gravity and moments of inertia ã models of solid objects suitable for computer processing ã It is also known as volume modeling . ã Primary uses of solid modeling are  – CAD, engineering analysis, product visualization  – computer graphics and animation,  – rapid prototyping,  – medical testing, visualization of scientific research .  3 ©M. S. Ramaiah Universit of Alied Sciences Facult of Enineerin & Technolo Solid Modeling…   Solid model may be constructed ã Sweeping    – An area feature is swept out by moving a primitive along a path to form a solid feature. These volumes either add to the object ( extrusion ) or remove material ( cutter path ).  – Also known as 'sketch based modeling'. ã Boundary representation  (BRep)  – A solid object is represented by boundary surfaces and then filled to make solid.  – Also knowing as 'surfacing'.  4 ©M. S. Ramaiah Universit of Alied Sciences Facult of Enineerin & Technolo Solid Modeling…   ã Parameterized primitive instancing.    – An object is specified by reference to a library of parameterized primitives .  – For example, a bolt is modeled for a library, this model is used for all bolt sizes by modifying a set of its parameters. ã Constructive solid geometry  (CSG)  – Simple objects (primitives) are combined using Boolean operations (union, difference, intersection) and linear transformations.  – A special data structure is called a CSG-tree, where primitives are leaves and operations are nodes.
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