The integration of sculptured surface and solid modelling techniques across a common geometric domain continues as an active source of research and development in computer aided geometric design. Although much progress has been made, fundamental difficulties remain due to the differing approaches to shape representation and subsequent evaluation found in the two modelling paradigms.

The first part of the paper reviews some of the issues arising when addressing the integration of existing sculptured surface representations into a Constructive Solid Geometry (CSG) based solid modeller. The second part describes work at Leeds which proposes the use of a new evaluation technique known as ISOS (Inner Set Outer Set) for CSG defined objects which incorporate both quadric and B-spline surface geometry.

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