Most adaptive slicing implementations assume a maximum allowable cusp height which applies to the entire part. Practically speaking, however, most parts do not have uniform cusp height requirements. Some faces are required to be smooth while other faces are relatively unimportant. With a uniform cusp height implementation, users must specify the most stringent cusp height which applies to the entire part. However, with non-uniform cusp height specifications, it is possible that further gains in adaptive slicing efficiency can be achieved. This paper presents an approach to specifying non-uniform cusp height requirements. First, a procedure is developed which uses an edge finding algorithm to identify faces on the part. The faces are then rendered using the OpenGL graphics libraries, and the user is prompted to enter the maximum allowable cusp height for each highlighted face. Implementation details and test results are presented.

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Ribbons may be used for the modeling of DNAs and proteins. The topology of a ribbon can be described by the link Lk, while its geometry is represented by the writhe Wr and the twist Tw. These three quantities are numerical integrals and are related by a single formula from knot theory. This article discusses the meanings of these three quantities, offers an approach for calculating their numerical values, and provides some examples.

This paper investigates the possibility of creating an insert mold using an epoxy resin composite (alurninum, resin and hardener), The properties of epoxy resin composite and rapid tooling techniques are studied and

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