issue with area lights

ZippZopp

i'm having an issue with area lights. it seems to happen almost everytime when i turn a light into an area light. i get this weird checker pattern all over the mesh that flickers and swims all over the mesh. if i capture an image from the viewport it isn't actually there. i had to do a printscreen to get this to show up. check the image out. i seem to have tracked down a few culprits here. it appears to be related to the normal map. if i turn the normal map off, the issue goes away. also, if i uncheck "scale & bias" and then check it back on again, the issue goes away until i move my camera. anyone else experience this? I'm running a GeForce Titan card

added a video to youtube showing the issue

https://www.youtube.com/watch?v=AREZQBn3KYc&feature=youtu.be

almighty_gir

this is interesting...

would you mind sending your scene file and the related normalmap over to support@marmoset.co so we can debug it?

cheers!

ZippZopp

i sent a scene file over. it doesn't seem to be related 100% to the scene i'm working on, i'm noticing it on other files as well, so I don't think it is an issue with my models or textures

almighty_gir

Thanks for sending it over, everyone on the team has tested it (we have a veriety of machine builds/cards) and we're unable to reproduce the issue.

Personally, i tried it with the scene as you sent it, as well as setting up new lights... and i've found no way of introducing the issue:


Do you happen to know which driver version you're running? I'm on 340.52.

ZippZopp

interesting! i'm on 344.75. let me roll back the driver and see what happens

ZippZopp

rolled back to 340.52 and the issue is gone. must be an nvidia driver issue. I'm going to continue installing the driver, one version at a time to see which version breaks it

update: nvidia 344.48 is where it breaks for me, any driver from there on forward seems to be busted. I tested 344.48, 344.60, 344.65 and 344.75 and they all have the same issue. I know there is also an issue with Knald and more recent nvidia drivers as well. with knald, anything before 344.11 seems to be fine, anything newer breaks that too

almighty_gir

Thanks for the confirmation! driver issues are a bit of a pain, we can't do much except bug nVidia to fix it =/

allaze-eroler

All my guess is : you can try contacting nvidia about this issue so, they will try to fix it up since you builded up a very good reputation thank to toolbag marmoset 2!

RC-1290

I just noticed a similar effect with the scene on my GTX 860M.
As a temporary workaround, you could try setting the resolution to half in the render settings. That seems to reduce the effect significantly for me.