Flickering in reflections

[GregCooper]

I'm currently getting a lot of flickering in reflections in my animated renders. Its like certain frames don't pick up lights in the scene. I'm using adaptive lights and brute force GI. I also tried rendering a sequence with adaptive lights and light cache but this still gave me flickering. Using Full Evaluation lights seems to fix the problem but its also making my renders about 5x longer (8-10min compared to 2min per frame) so I'd prefer to not go that route.

I've seen a few similar topics but I'm wondering whether there are recommended settings to fix this issue when rendering on GPU? Should I be using Brute Force or light cache with adaptive lights?

I'm using Vray Next for Maya

[matanov]

What are your LC settings?

[GregCooper]

I’ve tried quite a few different settings but seem to get the same result. Subdivisions at 1920 and also tried it at 3000. Use retrace threshold set to on. Filter size 0.15. Should I be using light cache instead of brute force for GI?

[matanov]

Retrace should be set at 8 for animations. Actually are you saying you got flickering with BF as well? If you do - then it's a bug.

[GregCooper]

Yes I’m getting flickering with Brute Force and adaptive lights. Brute Force with full evaluation lights gets rid of the flickering.

[yolov]

Can you get us a scene? That would be the easiest way for us the see what the problem is and figure out a fix or a workaround.

[GregCooper]

Hey Yolov, yes I will get a scene over to you when I can. Its such a large scene at the moment that it actually takes me a while to prepare something that I can even send over but will do this when I get a chance