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Cell-decomposition
In cell-decomposition, an object can be represented as the sum of cells into which it can be decomposed. Each cell-decomposition system defines a set of primitive cells that are typically parameterized and are often curved. Cell-decomposition differs from primitive instancing in that we can compose more complex objects from simple, primitive ones as a bottom-up fashion by "gluing" them together. The glue operation can be thought of as a restricted form union in which the objects must not intersect. Further restrictions on gluing cells often require that two cells share a single point, edge, or face. Although cell-decomposition representation of an object is unambiguous, it is not necessarily unique, as shown in Figure 6.39. Cell-decompositions are also difficult to validate, since each pair of cells must potentially be tested for intersection. Cell-decomposition is important for use in finite element analysis.
Transformation Hardening The main features of the laser as a heat source for transformation hardening are: (A) Clean energy source. (B) Energy is localised: no heat spillage.
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Sweep Representations The simplest form of sweep is that produced by sweeping a two-dimensional area along an axis perpendicular to its plane. This form of sweep is most usefu
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