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Bidirectional path tracing added!

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Ondra:
I've finally completed the bidirectional path tracing implementation. It is new unbiased GI method, much faster in certain difficult scenes.

Comparison with path tracing:


Caustics-heavy scene (the patterns on ceiling are caustics)

racoonart:
new toys available in the daily builds soon? ;)
Looks awesome btw! :)

Ondra:
soon ;) - as soon as I decorrelate direct lighting, and make it work with ideally specular materials

alieneye:
great!

racoonart:
Do you think "fancy lots-of-small-windows-cathedral scenes" will be faster with the new bidirectional path tracing? Tried some animation tests today and I came to the conclusion that i will have to wait for faster sampling stuff ;)

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