Patel, Manjula2014-10-212014-10-2119891467-8659https://doi.org/10.1111/j.1467-8659.1989.tb00515.xThe Programmer s Hierarchical Interactive Graphics System (PHIGS) is about to become a standard graphics system? which caters for the definition, display and modification of two and three-dimensional graphical data.PHIGS, however, is mainly a wireframe system, and the PHIGS+, extensions to it have been put forward to allow the incorporation of shaded 3D graphics into PHIGS.,One area that is important to a large constituency and which has so far not been considered in PHIGS, and PHIGS+, is that of solid modelling. This paper addresses one aspect of solid modelling by describing a simple method for the representation, evaluation and display of Constructive Solid Geometry (CSG) models in PHIGS, and PHIGS+..10.1111/j.1467-8659.1989.tb00515.x337-345