Interactive design of parameterized 3D models by direct manipulation

Fülszöveg

The practical applicability of a computer-aided design system is strongly influenced by both the user interface and the internál model representation. A well-designed user interface by offering an intuitíve environment for specification and representation of model information. An internál model representation, capable of stofing geometric, topological and hierarchical dependenties between components in a model, increases the efficiency of the system by facilitating modification and elaboration of the model during the different stages of the design process. The subject of this thesis is the integration of a high-level parameterized model representation with direct manipulation interface techniques for the design of three-dimensional objects. A direct manipulation user interface enables the user to specify a model by interaction on a graphical representation, as an alternative for an abstract and error-próne alphanumerical dialogue style. A high-level model representation is obtained... Tovább

Fülszöveg

The practical applicability of a computer-aided design system is strongly influenced by both the user interface and the internál model representation. A well-designed user interface by offering an intuitíve environment for specification and representation of model information. An internál model representation, capable of stofing geometric, topological and hierarchical dependenties between components in a model, increases the efficiency of the system by facilitating modification and elaboration of the model during the different stages of the design process. The subject of this thesis is the integration of a high-level parameterized model representation with direct manipulation interface techniques for the design of three-dimensional objects. A direct manipulation user interface enables the user to specify a model by interaction on a graphical representation, as an alternative for an abstract and error-próne alphanumerical dialogue style. A high-level model representation is obtained by using a procedúrái modeling language with generál purpose control structures, including arithmetic and logical expressions, repetition, conditionals, functions and procedures, and dedicated data types such as coordinate systems, geometric primitives and geometric constraints. The language interpreter is interconnected with a graphical interface, an incremental constraint solver and a geometric modeler, using visual programming techniques. The developed techniques are implemented in a modeling system called GeoNode. The system incorporates paradigms of object-oriented design, with respect to both the user interface and to the system implementation. The applicability of the presented techniques is illustrated by examples in application domains such as solid modeling, kinematic analysis, feature modeling and top-down design. Vissza