Boxes

[glorybound]

V-Ray 5 with Forest gives me these boxes. I am using an HDRI.

[Joelaff]

Are you perhaps using VrayEnvironmentFog?

Either way try disabling Adaptive Lights.

[glorybound]

Yeah, disabling adaptive was my first idea, which didn’t help. No fog and only on my Forest Pro grass.

[DJSLRP]

I just posted something similar, but the blocks in my render are isolated to specific areas, not randomly like yours.

[glorybound]

This hasn't happened since.

[rusteberg]

I've got them too, but I'm on build 4.30.00 using Bucket sampler with default settings (adaptive lights on, vray sky as gi). I'll try turning off adaptive - had forgotten about that.... What does "Light Tree" do in comparison to Full evaluation/Adaptive?

[glorybound]

Have you disabled denoiser?

[rusteberg]

No, I have denoiser enabled (default settings). I switched from adaptive to light tree (after looking it up in the docs), which appears to have solved the issue at the expense of additional render time.

[a7az0th]

If the problem is reproducible, please send a scene over for investigation. I've seen such issues with adaptive lights from time to time, but I believe these have already been resolved, so this is strage.