Extreme noise in VrayLighting pass

[thomascoote]

Hi all,

 

I've been having some trouble with getting rid of noise in my internal renders. External renders come out fine because I rely mostly on GI for the lighting, but using VrayLights on an internal office I'm working on produces huge amounts of noise, which is isolated to the lighting pass.

 

I've made sure the lights don't intersect geometry, I've raised the light subdivs, all the way up to 1000 even and it makes zero difference, I've swapped my original sphere lights out for plane lights, reduced to intensity way down and compensated using the exposure settings... I can't seem to get rid of the noise no matter what I do.

 

Does anyone have any tips or ideas for getting rid of this noise? I'm using a white VrayMaterial with no reflectivity as an override whilst I get the modelling and lighting set up.

 

Thanks!

 

[thomascoote]

After searching through old threads, I'm going to try turning off the "probabilistic lights" option in my render settings and see if that fixes it.

 

I'll report back later when I have had time to try this.

[thomascoote]

Update: That was it.... Disabling probabilistic lights in the Vray tab sorted it instantly. Much longer render times but zero noise.

[Francisco Penaloza]

What type of Gi are you using? Brute force or IRR?

[thomascoote]

Originally brute force, switched to IRR. Same problem occurred with both

[Corey Beaulieu]

Probabilistic is a bad feature for default on. So few scenes have enough lights to cover the spread while simultaneously lighting the scene cleanly. In fact, I would think only their example in the help menu.