User Interface for Surface Pasting

Surface pasting is a composition method that applies B spline surfaces called features to any number of other B spline surfaces called base surfaces in order to add details on the base surfaces The locations as well as the size of the features are determined by transformations of feature domains By modifying the domain layout of pasted surfaces we can manipulate the appearances of features interac tively in a Domain Space User Interface However this domain user interface is inadequate because the user cannot interact with the three dimensional model di rectly In this thesis I propose a World Space User Interface that attempts to map three dimensional user actions to two dimensional domain operations and aims at providing a more intuitive and e cient modeling interface for surface pasting