Raytraced Caustics - possible?

eco_bach2 · October 17, 2020, 2:14pm

Have any RayTracing experts tried to create caustics effects from reflected or refracted water or glass materials?

Is this even possible? Or do you still have to ‘fake’ any caustic effects?
This GDC video seems to indicate it is.

gabor.papp · October 24, 2020, 6:31pm

Nvidia has a UE4 fork with raytraced caustics:

eco_bach2 · October 30, 2020, 1:42pm

I’ve also see it done with the native branch but very little info on how it was accomplished other than light functions were used.

gabor.papp · October 30, 2020, 2:05pm

Interesting. I didn’t think it was possible with the main branch.
The Nvidia one has samples and work nicely, though.

gabor.papp · April 25, 2021, 8:47am

I don’t think it is gone, there is even seems to be a new branch updated for 4.26:
https://github.com/NvRTX/UnrealEngine/tree/NvRTX_Caustics-4.26

Menesis · April 25, 2021, 8:20am

The fork is gone unfortunately. Any tips where to find it or how to do caustics?

awsc · March 30, 2023, 5:34am

Both 4.27 and 5.1 version is still accesable:
427:https://github.com/NvRTX/UnrealEngine/tree/NvRTX_Caustics-4.27
5.1:https://github.com/NvRTX/UnrealEngine/tree/NvRTX_Caustics-5.1
You can find relevant docs and corresponding demo projects from git readme, please register Nvidia developer account first and then link to your git repro.

Cheers