Bidirectional path tracing added!

[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 ;)

[michaltimko]

Seen it on fb, looks awesome. Looking forward ;)

[Ondra]

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 ;)

No, it won't probably help with this...

[maru]

Awesomeness!

[Ondra]

I've moved the offtopic discussion about localization here: http://forum.corona-renderer.com/index.php/topic,164.0.html

[lacilaci]

incredible...

[woshilvba]

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)

It can improve the the diffuse reflection rendering speed?

[Ondra]

It can greatly improve various configurations, with diffuse or specular materials

[maru]

Does it have any disadvantages?

[Ondra]

yes, its slower in simple scenes (with no caustics or highlights), and does not handle SDS (specular-diffuse-specular) paths well - you can see that in the glossy cornell box - the reflection on the left box of the caustics on the floor

[lacilaci]

Will it be possible to disable caustics themselves but still use bidir for complex interior like scenes, expecting some rendering speed gain?