Issue No.06 - June (1971 vol.20)
A procedure for computing shaded pictures of curved surfaces is presented. The surface is approximated by small polygons in order to solve easily the hidden-parts problem, but the shading of each polygon is computed so that discontinuities of shade are eliminated across the surface and a smooth appearance is obtained. In order to achieve speed efficiency, the technique developed by Watkins is used which makes possible a hardware implementation of this algorithm.
Coons patches, curved surfaces, halftone, hidden-line removal, shading.
H. Gouraud, "Continuous Shading of Curved Surfaces", IEEE Transactions on Computers, vol.20, no. 6, pp. 623-629, June 1971, doi:10.1109/T-C.1971.223313