why is the new vray nexthair much brighter on GPU.?
maya2017 and standard xGen
The two engines use different algorithms and their goal is not to match 1:1.
If you want the same result on CPU as on the GPU, enable the C++/CPU device from the V-Ray GPU device list.
Best,
Blago.
That is so much off that isnt acceptable. Sorry.
That are two worlds.
Slightly diffrent looks are ok and understandable but this is to extreme.
Of course it can be a bug, but we can’t really say without the scene as it can be caused by so many different things - different max depth clamps, different max ray intensity clamp, different GI engine, different GI settings, different light settings, etc.
Best,
Blago.
I will upload a repro scene tomorrow.
Thanks.
Thanks!
Best,
Blago.
i had to rebuild the scene in the office… and now now diffrence 
think i had some hair sampler nodes flying around in the old scene, maybe that caused the issue.
nothing to see all is fine. sorry.
but here the file if you like to play with it.
maya2017
groom.zip (1.42 MB)
Thank you for the provided scene file.
I made a few tests and it could be noticed slight difference indeed between CPU and GPU, but the results cannot be compared with your screenshots form the first post. These differences are acceptable.
If you notice any unusual results in the future, let us know so we could have a look.
thanks for double checking! if i get the error from the screenshot above i will upload the scene as well.