Chapter 13. Volumetric Light Scattering as a Post-Process
Kenny Mitchell Electronic Arts
In this chapter, we present a simple post-process method that produces the effect of volumetric light scattering due to shadows in the atmosphere. We improve an existing analytic model of daylight scattering to include the effect of volumetric occlusion, and we present its implementation in a pixel shader. The demo, which is included on the DVD accompanying this book, shows the technique can be applied to any animating image of arbitrary scene complexity. A screenshot from the demo appears in Figure 13-1.
Figure 13-1. Volumetric Light Scattering on a Highly Animated ...
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