Alternative Approaches in Geometric Modelling

As systems for computer-aided design and production of mechanical parts have developed there has arisen a need for techniques for the comprehensive description of the desired part, including its three-dimensional shape. The creation and manipulation of shapes is generally known as Geometric Modelling, but some misconceptions have arisen as to the true meaning and import of the term. The paper argues for a broad, flexible approach to the subject, allowing the use of many techniques suited to particular applications, unifying them through common data structure