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Lecture 13: Global Illumination and Path Tracing (119)

There's a variety of algorithms that converge faster for caustics than naive path tracing. One method is photon mapping - it uses some tricks on how light paths are interpolated. Another algorithm is Metropolis Light Transport which works by finding the most significant light path in the scene and exploring other paths around it.


It seems like this would be challenging because light is coming in from many areas making importance sampling less effective.


One of the most difficult areas for this scene would be getting the light reflection in the shadowy area to look realistic. Right off the bat, you can see that the lighting in the shadow feels off. Not really sure why this effect happens for path tracing though.

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