Abstract
Contemporary CAD systems do not encourage a designer to change the geometry of free-form surfaces. The lack of flexibility to modify preliminary design objects is, in general, the major obstacle for effective computer support during conceptual modelling. We have studied this problem for the process of fast creation of three-dimensional (3D) free-form product shapes. Any tool in this process must at least offer the speed, flexibility and intuitiveness common for traditional working procedures based on sketching on paper. A feasible way to significantly enhance conceptual shape design is fast and easy entering of paper sketches into 3D model space. Utilizing this principle we have developed a new algorithm for the input and modification of hand-sketched profile curves. The algorithm has been incorporated in a prototype surface modeller in which the profiles, and thus the surfaces in 3D, can be directly modified by sketching. The resulting system has been tested by industrial design professionals. Their opinions were encouraging and led to a number of recommendations for the tool. We describe the algorithm, its implementation and its application in geometrical design. We also present examples and results obtained with the sketching system.
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