Abstract: The invention provides a computer-implemented method and system intended for designing an assembly of a plurality of objects. The assembly is modeled by a directed acyclic modeling graph having nodes and arcs. Each node represents an object of the assembly. Each arc represents the use of an end node by an origin node. At least one arc is uniquely identified by an identifier. The assembly is further modeled by at least one relation having at least one tuple containing a first chain of at least one identifier. The method comprises determining at least one mapping between the first chain and a second chain of at least one identifier as well as substituting at least one occurrence of the first chain in the tuple of the relation with the second chain. The invention provides a means to repair broken tuples automatically and thus to facilitate design.

Abstract: A three-dimensional solid geometry modeling method is described that can move or modify any piece of solid or surface geometry, such as a protrusion or depression, when faces are changed in a way that is not obvious or predictable from the original data. The method involves a combination of local changes and a context-based process that uses simplification, detaching, modification, and reattaching algorithms. The method is invoked automatically when a modeling tool (such as Move or Pull) is used to move or modify a piece of geometry. During the movement or modification, the geometry reflects the changes dynamically as the user interacts with the modeling tool. When performing the modification, simplification of the faces and edges can be manually or automatically invoked.

Abstract: The invention provides a computer-implemented method and system intended for designing an assembly of a plurality of objects. The assembly is modeled by a directed acyclic modeling graph having nodes and arcs. Each node represents an object of the assembly. Each arc represents the use of an end node by an origin node. At least one arc is uniquely identified by an identifier. The assembly is further modeled by at least one relation having at least one tuple containing a first chain of at least one identifier. The method comprises the step of determining at least one mapping between the first chain and a second chain of at least one identifier as well as the step of substituting at least one occurrence of the first chain in the tuple of the relation with the second chain. The invention provides this way a means to repair broken tuples automatically and thus to facilitate design.