Shading Models for Scan-Line Graphics

Introduction

A shading model is a method of applying a local illumination model to an object, usually an object modelled as a polygon mesh. There are four shading models we will consider: Constant, Faceted, Gouraud, and Phong. They give increasingly good images and are increasingly computationally expensive.

Constant shading model

Faceted shading model

Gouraud shading model

Phong shading model

Scan Line Graphics
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Last changed October 21, 1999, G. Scott Owen, owen@siggraph.org