Gpu vs cpu

[chadstevens]

Hi all.

I was just testing the differences between CPU and GPU.

Attached are 2 images, both with the exact same settings in terms of materials and lights.

I'm just wondering which one is more accurate, as in which one would match reality closest if I had to set up the scene in the real world.
I am surprised that the IOR seems to be different between them which doesn't make any sense to me.

[hermit.crab]

Could you send the scene to support@chaosgroup.com so we can take a look? Mention this thread in the e-mail along with your V-Ray and host platform versions.

[piotrus3333]

isn’t refl/refr trace depth still cut at 5 by default in GPU?

[chadstevens]

isn’t refl/refr trace depth still cut at 5 by default in GPU?

I set the refraction/reflection trace depth to 30 on both, I'm not sure if GPU has an override that cancels this out in the material though, so could be.

[piotrus3333]

gpu’s limit is always active (render settings).
cpu’s limit is off by default.

[chadstevens]

gpu’s limit is always active (render settings).
cpu’s limit is off by default.

Where is the override located? It's not in Global switches as it is in Vray CPU.

[chadstevens]

I just had a look at the help document and it says it's not supported in Global Switches GPU, so how would you change the depth?

hermit.crab Is it really locked to 5 for GPU, that seems like a massive problem for accurate rendering?

I have sent the scene to Chaosgroup Support.

Cheers.

[piotrus3333]

Where is the override located? It's not in Global switches as it is in Vray CPU.

performance tab >> trace depth

[chadstevens]

performance tab >> trace depth

Thanks, it now looks much closer to the CPU image, I wonder why the naming convention and the location for these settings are different from CPU to GPU, very confusing.

Thanks again.