Illumination for Computer Generated Pictures The quality of computer generated images of three-dimensional scenes depends on the shading technique used to paint the objects on the cathode-ray tube screen. The shading algorithm itself depends in part on the method for modeling the object, which also determines the hidden surface algorithm. The various methods of object modeling, shading, and hidden surface removal are thus strongly interconnected. Several shading techniques corresponding to different methods of object modeling and the related hidden surface algorithms are presented here. Human visual perception and the fundamental laws of optics are considered in the development of a shading rule that provides better quality and increased realism in generated images. CACM June, 1975 Phong, B. T. computer graphics, graphic display, hidden surface removal. 3.26 3.41 8.2 CA750602 JB January 9, 1978 1:46 PM 2751 5 2751 2751 5 2751 2751 5 2751 2816 5 2751 2827 5 2751 2828 5 2751 2913 5 2751 3047 5 2751 1751 6 2751 2004 6 2751 2493 6 2751 2751 6 2751 2751 6 2751 2751 6 2751 2751 6 2751 2751 6 2751 2771 6 2751 2829 6 2751 2829 6 2751 2841 6 2751