Constraint−based modeling of three−dimensional shapes

This paper shows that constraint−based modeling, so far perceived primarily as a graphics technique for man−machine interaction, also provides a viable method for the modeling of complex surfaces. The idea of constraint−based modeling of three−dimensional shapes is described and illustrated by examples. Difficulties related to the practical application of this idea are discussed, and methods for overcoming them are outlined. A potential of the constraint−based approach to the modeling of shapes found in nature is indicated.