In the Unreal Engine NvRTX Caustics version, when path tracing is turned on, specular light cannot be seen

Gaming and Visualization Technologies Engines Unreal
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The first image is in normal lighting mode, with normal light reflection. The second image is after turning on path tracking, and the reflected light cannot be seen

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Hi there @Jaxxx, welcome to the NVIDIA developer forums.

Can you please share which Caustics branch you are using?
And when you say “path-tracing”, do you mean the UE built-in path tracing option?

Thanks!

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My Caustics branch version is NvRTX_ Caustics 5.1, “path tracing” is UE built-in path tracing, and its activation method is shown in the image.

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Thank you!

One thing to try is to upgrade to the 5.2 version of the Caustics branch if possible, it was recently updated.

And then i am also not sure how well our Caustics integration plays with the UE path-tracing implementation. It is very well possible that there are internal conflicts.

Maybe @jackwang1 knows more about this?

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Hi @Jaxxx We’ve never touch the relevant code in path tracing module, I’ve double checked the vanilla UE 5.2.1 behavior that is identical with our NvRTX Caustics branch. Cheers.

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Thank you. I will try it.

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