RTX producing shading/GI artifacts compared to CUDA and CPU

[Alex_M]

I'm observing shading/GI problems when using RTX and VrayDirt map in an interior scene I'm working on currently. It seems that RTX produces shading/GI artifacts when I use VrayDirt map with the option "Ignore for GI" turned on. The issue doesn't seem to be there with CUDA and CPU.

Please check the screenshots below. With RTX the white window frames come out darker than they should be whereas CUDA and CPU render them properly lit from the bounced lighting. You can also see a similar issue happening on the ceiling which also exhibits strange shading in RTX.

The issues go away if I turn off "Ignore for GI" in the VrayDirt map used in the diffuse slots of the wood paneling and the ceiling. Let me know if I should send the scene.

[hermit.crab]

Best send the scene via the contact form so we can take a look. Address it to me in the subject and include a link to this thread in the message.

[Alex_M]

Scene sent! The ticket number is 347-482-8679.

[hermit.crab]

Thanks for the provided scene. It seems the artifacts are directly related to the VRayDirt's effect when a VRayTriplanarTex is involved (I managed to reproduce it on a fresh scene with two neighboring objects, the bitmap textures of which go through a VRayDirt's unoccluded slot, while one of them goes through a VRayTriplanarTex as well). The issue, however, seems to be fixed in the internal nightlies. Could you confirm?

[Alex_M]

I can confirm that this has been fixed with the nightly I'm using.

[Alex_M]

Oops. I spoke too soon. The problem is still present with the stable nightly build I have installed (see signature) and the latest stable one from today.