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This book proposes a feature-based design approach for three dimensional block structured components with generalized orthohedral geometry. The component is viewed as a collection of blocks connected by topological links. The geometry and topology are explicitly de ned. The geometry of the feature consists of an external shape and an internal shape, while the topology is modeled using a graph. The basic external shape of each block in a component is a rectangular parallelopiped which xes overall size and location of the block. Using the idea of encapsulation, families of blocks with di erent...