Silicon Graphics

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(-) OpenGL Programming Guide
(-) Chapter 10The Framebuffer
(-) The Accumulation Buffer

Soft Shadows

To accumulate soft shadows due to multiple light sources, render the shadows with one light turned on at a time, and accumulate them together. This can be combined with spatial jittering to antialias the scene at the same time. See "Shadows" for more information about drawing shadows.

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OpenGL Programming Guide

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