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Fundamentals of Computer Graphics, 4th Edition by Peter Shirley, Steve Marschner

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Chapter 23

Global Illumination

Many surfaces in the real world receive most or all of their incident light from other reflective surfaces. This is often called indirect lighting or mutual illumination. For example, the ceilings of most rooms receive little or no illumination directly from luminaires (light-emitting objects). The direct and indirect components of illumination are shown in Figure 23.1.

Figure 23.1

Figure showing in the left and middle images, the indirect and direct lighting, respectively, are separated out. On the right, the sum of both components is shown. Global illumination algorithms account for both the direct and the indirect lighting.

In the left and middle images, the indirect and direct lighting, respectively, are separated out. On the right, the sum of both components is shown. Global illumination algorithms account for both the direct and the indirect lighting. ...

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