The generation of 3D solid objects, and more generally solid geometric modelling, is very important in Computer Aided Design (CAD). This paper presents a simple but effective algorithm for automated display of perspective views of Constructive Solid Geometry (CSG) scene models. This algorithm can be implemented as a module in such a way that it is easily integrated, without any modification. to the present systems of "pixel-based Z-Buffer" CSG renderers. An implementation of the algorithm for such a system is also given in the paper.