Author:
Bishop Gary,Weimer David M.
Abstract
Computer image generation systems often represent curved surfaces as a mesh of planar polygons that are shaded to restore a smooth appearance. Phong shading is a well known algorithm for producing a realistic shading but it has not been used by real-time systems because of the 3 additions, 1 division, and 1 square-root required per pixel for its evaluation. We describe a new formulation for Phong shading that reduces the amount of computation per pixel to only 2 additions for simple Lambertian reflection and 5 additions and 1 memory reference for Phong's complete reflection model. We also show how to extend our method to compute the specular component with the eye at a finite distance from the scene rather than at infinity as is usually assumed. The method can be implemented in hardware for real-time applications or in software to speed image generation for almost any system.
Publisher
Association for Computing Machinery (ACM)
Subject
Computer Graphics and Computer-Aided Design,General Computer Science
Reference5 articles.
1. Smoothly shaded renderings of polyhedral objects on raster displays
2. Continuous Shading of Curved Surfaces
3. Newman W. N. and R. F. Sproull. 1979. Principles of Interactive Computer Graphics McGraw-Hill New York NY. Newman W. N. and R. F. Sproull. 1979. Principles of Interactive Computer Graphics McGraw-Hill New York NY.
4. A Software Testbed for the Development of 3D Raster Graphics Systems
Cited by
42 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献