Adaptive lights causing artifacts in Environment Fog

[kosso_olli]

Hey,
I am pretty sure there already was a thread about this, but I can't find it. The adaptive lights are causing some block type artifacts in the environment fog. I attached two screens. If I set the lights to probabalistic or full light eval, the problem is gone. Adaptive is rendering insanely fast though. I didn't calculate the difference, but it is easily 3 times faster.
This is on Build 3.50.04.

Regards

Oliver

[vlado]

I should have a fix for this next week, email me to vlado@chaosgroup.com if you want to test it.

Best regards,
Vlado

[kosso_olli]

May I send you a scene for testing?

[Bruce Hart]

Hey all
Perhaps this is the same or related problem. The attached link is for a stripped concept model my colleague was working on. As you can see in the Raw Lighting pass also attached, having Adaptive lights turned on results in slightly different lighting in distinct square areas of the image. These squares seem to be independent of the render buckets used, and appear with IR or Brute Force GI. If lights are turned to Full Evaluation the problem goes away. This problem occurs even when DR is off.

https://www.dropbox.com/s/hx0hbs1fyg...blem1.zip?dl=0

[vlado]

Hi Bruce,

I have a fix for that too, so same as above - vlado@chaosgroup.com

Best regards,
Vlado

[vlado]

Actually, Bruce, in your case the issue is with the subpixel mapping option. Turn it off and the problem will go away. V-Ray does print a warning about this... that option is evil.

Best regards,
Vlado

[Bruce Hart]

OK will try that - thanks for your help as always Vlado