Silicon Graphics

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(-) OpenGL Programming Guide
(-) Chapter 6Lighting
(-) A Simple Example: Rendering a Lit Sphere

Define Normal Vectors for Each Vertex of All the Objects

An object's normals determine its orientation relative to the light sources. For each vertex, OpenGL uses the assigned normal to determine how much light that particular vertex receives from each light source. In this example, the normals for the sphere are defined as part of the auxSolidSphere() routine. See "Normal Vectors" for more details on how to define normals.

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OpenGL Programming Guide

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