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Physically Based Rendering, 3rd Edition by Greg Humphreys, Wenzel Jakob, Matt Pharr

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06

Camera Models

In Chapter 1, we described the pinhole camera model that is commonly used in computer graphics. This model is easy to describe and simulate, but it neglects important effects that lenses have on light passing through them that occur with real cameras. For example, everything rendered with a pinhole camera is in sharp focus—a state of affairs not possible with real lens systems. Such images often look computer generated. More generally, the distribution of radiance leaving a lens system is quite different from the distribution entering it; modeling this effect of lenses is important for accurately simulating the radiometry of image formation.

Camera lens systems also introduce various aberrations that affect the images that they ...

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