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Item A CSG LIST PRIORITY HIDDEN SURFACE ALGORITHM(The Eurographics Association, 1985) Jansen, F.W.; C.E. VandoniSeveral algorithms exist for visualizing geometric models defined by constructive solid geometry (CSG). Each of these algorithms is based on standard hidden surface methods, such as ray tracing, scan-line and z-buffer algorithms. In this paper a CSG list priority algorithm is described that is combined with a ray tracing algorithm in the use of a spatial subdivision technique and a CSG list structure to exploit CSG coherence. The combined algorithm is designed for interactive viewing and high quality rendering of CSG models with faceted primitives.Item Some Issues in Designing User Interfaces to 3D Raster Graphics(Blackwell Publishing Ltd and the Eurographics Association, 1985) van Wijk, J.J.; Jansen, F.W.; Bronsvoort, W.F.Now that raster graphics has become a common tool in CAD/CAM systems, animation and many other applications, the need has arisen for user interfaces to graphics packages for these new applications. On the basis of a typology of the users, an analysis is presented of some of the choices which have to be made in developing these interfaces.