PHONG SHADING BY BINARY INTERPOLATION

This paper presents a new vector interpolation method for Phong shadin g, referred to as binary interpolation. It can calculate the reflectio n model by a scalar method. A pre-defined table is used to convert sca n lines into segments, each of which is a power of two in length. Then binary interpolation is carried out in each segment. The new method h as been tested in two situations; firstly with various sizes of right angled triangles, secondly with the Utah teapot. The results show that , excluding plot to screen time, binary interpolation can decrease the calculation time for a reflection model by about 20%. Copyright (C) 1 996 Elsevier Science Ltd.