Chapter 11: Creative Shape Interpretation in Paper Scribbles

The virtual product data model in its different stages is an essential prerequisite for the virtual modeling of processes and their virtual simulation. Product design starts with conceptual design including the concepts for the future productpsilas shape and function - the gestalt. In this stage, the designers work on fuzzy product data interpreted in so-called scribbles and applied to perception modeling and shape creating. In the paper we will suppose methods to analyze paper scribbles for the creation of fuzzy-spline pre-CAD shape models. In particular, the paper discusses special geometrical issues that are concerned with the interpretation of the future productpsilas contours within paper scribbles and virtual pre-CAD models. Examples of curve and closed region modeling strategies based on a blurred 2D description will be presented. The implemented algorithms combine image-based modeling methods with usual computer-aided design (CAD) modeling strategies.