GPU and CPU rendering - COMPLETELY different.

[hve]

I did some more tests this times with caustics (something I don't use that much) but I must admit that indeed there's quite a bit of difference in both renders

[ivuzem]

I'm in jewellery rendering, and I use caustics all the time. At least I try. And I have also noticed a big difference in caustics on GPU/CPU... Also, Spotlight color map seems to have different positions on GPU vs CPU. I'm thinking it is the similar problem as with caustics, it seems like the HDRI position is different, so that is why we're getting different caustics results.

[hve]

Not sure if this is of any help but I noticed that it's especially an issue with some floor materials in this examples, not all materials have the above issue

[Will Gibbons]

Not sure if this is of any help but I noticed that it's especially an issue with some floor materials in this examples, not all materials have the above issue

Good point. I think this is part of the issue unfortunately. It's the unpredictability that can be problematic. It's a bit easier when the rules are quite rigid, but when there are some things that work and some that don't... it's hard to keep track of what can be relied on and what can't be.

[hve]

Good point. I think this is part of the issue unfortunately. It's the unpredictability that can be problematic. It's a bit easier when the rules are quite rigid, but when there are some things that work and some that don't... it's hard to keep track of what can be relied on and what can't be.

yes indeed Will, now I know of the problem I try to compare more between both renders and there's definitely something going on that's strange