Wrong glass ior on gpu

[Karol.Osinski]

Hi,
V-Ray GPU seems adding the glass ior values when passing through multiple refractive surfaces.
On CPU objects behind all the windows are not distorted.

regards,
Karol

[hermit.crab]

Are any of those single-sided? You may need to turn on the "Thin Glass" option for them. Otherwise, you're saying that CPU produces different results? Could you simplify the scene (only glass planes should suffice) and attach it here?

[Karol.Osinski]

Hi, it does not allow me to upload the .mb file so here is the link with a very simple scene. All glasses have real life thicknes. It is true that the problem does not appear with a single-sided glass, but it is not a solution in many cases.

https://drive.google.com/file/d/1Qf_...ew?usp=sharing

kindest regards,
Karol

[hermit.crab]

Thanks for the provided scene. The issue is a common one and it's caused by the fact that, currently, the IPR trace depth settings (Render Setup> IPR > Shading) in GPU act as a global override. Simply increase the value to resolve the issue. Otherwise, we've already started working on improving the trace depth workflows in general, where resolving the IPR override is part of the fix.

[Karol.Osinski]

The thing is that those renders weren't done in IPR but in production mode. In fact, in IPR the CPU results are wrong as well.

[hermit.crab]

The thing is that those renders weren't done in IPR but in production mode. In fact, in IPR the CPU results are wrong as well.

Yes, since the default global trace depth for IPR in your scene was 5, which was not enough. In GPU, that parameter controls both IPR and Production, which should not happen as mentioned in my previous post.

[Karol.Osinski]

Ahhhh, I misunderstood your previous post then! Thanks a lot. I will give it a try today!!!!