7
Image-Based Lighting
Since HDR images may represent the true physical properties of lighting at a given point, they can improve the rendering process. In particular, a series of techniques commonly referred to as image-based lighting (IBL) provide methods of accelerating the rendering computations lit by HDR images. These HDR images are, almost always, obtained by capturing the entire sphere of lighting at a point in a real scene. IBL methods render content by using the captured HDR image as lighting in shading computations, recreating the same physical lighting conditions in the virtual scene as in the real scene. This results in realistic-looking images that have been embraced by the film and games industries.
Figure 7.1. The Computer ...
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