Vray 6 GI flicker

[Twist]

Hello. I have a problem with GI flickering. This is the GI pass.

Vray version 6.00.02

Settings:



What is causing the flickering? I have followed the recommended settings.

[stezza]

Turn off Reflective and Refractive caustics
Switch to brute force.
But what are your V-Ray tab setings?

[Twist]

Turn off Reflective and Refractive caustics
Switch to brute force.
But what are your V-Ray tab setings?

Thank you for your suggestion.

Here's the vray tab settings



What should I set the brute force GI depth to? Default is 3.

I just find it weird that flickering is still an issue. I thought Hash Maps made it a thing of the past.

[stezza]

Thats what I would have used so looks fine to me. Keep BF depth to 3 if it's external render or bump it up to 4-6 if interior.

[Twist]

Thats what I would have used so looks fine to me. Keep BF depth to 3 if it's external render or bump it up to 4-6 if interior.

Thank you, I'll try it

[intercard]

Hummm this is not normal !!
Hey bro !! do you can update the full scene ?
I will need check it !!

[Twist]

Hummm this is not normal !!
Hey bro !! do you can update the full scene ?
I will need check it !!

I can’t share the scene because of NDA, but maybe i Can make a example scene that mimics the conditions

[yolov]

Can you check what does it read in Render Settings > Overrides > Lighting > Light evaluation?
See if using the Light Tree mode helps in any way? If it does, it would help to get a scene whenever possible to debug and fix this.

[waaazoo]

I have a similar flicker now with Vray6 (Maya). I tried adaptative lights and Light tree. I'm doing right now a test with BF+BF to see if that flicker disappears, but it's quite curious.

[Morbid Angel]

without looking at the scene, my bet would be that the geometry of the walls is not thick. If unchecking reflective caustics didn't solve it, see if you can isolate it down to which light is causing the flickering (if there is a light), if the gi is emitted from geometry instead of a light that can also be a reason.

[waaazoo]

Hi Dmitry,

In my case, it is/was a ocean scene. After stripping down and testing a lot, it came out that it was also a mesh that generated this flickering/pumping, even with BF+BF. Putting a VrayObjectProperty on this mesh and unchecking GI, made things work again. It was not a double mesh issue or similar.
So, my conclusion is at least, if you get such problems, always look at the meshes

[vlado]

Would it be possible to get a scene for this? Ideally there shouldn't be flickering, whatever the cause.

Best regards,
Vlado

[waaazoo]

Would it be possible to get a scene for this? Ideally there shouldn't be flickering, whatever the cause.

Best regards,
Vlado

Hi Vlado,

The project has been submitted yesterday (65819). I would be happy to know why this flicker occurred.

cheers

[waaazoo]

Would it be possible to get a scene for this? Ideally there shouldn't be flickering, whatever the cause.

Best regards,
Vlado

Hello Vlado,

did you have a chance to look why this flickering occurred in my scene ?

best,

Olivier