GWB: A Solid Modeler with Euler Operators

In Helsinki, a Small but General Set of Manipulative Operations for Boundary Models of Solid Objects Has Been Used to Construct a Comprehensive Solid Modeling System.     

HutWindows: an improved architecture for a user interfacemanagement system

The design of HutWindows, a user interface management system intended for applications in mechanical CAD, is discussed,. HutWindows features a three-layered internal architecture, where the presentation, dialogue-control, and application-processing layers are clearly separated from each other. This leads to increased simplicity and flexibility in user interface design over the more traditional situation where all of these layers are closely coupled