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

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Light Transport III: Bidirectional Methods

The integrators in the previous two chapters have all been based on finding light-carrying paths starting from the camera and then only trying to connect with light sources at the last vertices of the paths. This chapter introduces algorithms based on sampling paths starting from both the camera and the lights and then connecting them at intermediate vertices. These algorithms can be much more efficient at finding light-carrying paths than approaches that only construct paths from the camera, especially in tricky lighting situations.

The foundations of bidirectional light transport are fascinating. On one hand, the physics of light scattering are generally reversible with respect to the direction ...

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