Black dots

[Tycane]

Hi!

I'm having this problem with my render i can't seem to figure out, i'm getting all these black dots all over my render.
I'm using VraynextGPU, progressive (coz bucket just seems to hard crash max with this scene), the scene used to be redshift, but i replaced the materials, merged all the assets into a fresh scene and did a scene convert to make sure nothing RS was left
Furthermore there is environment fog in the scene and Ornatrix, but the dots appear even if i render the scene with everything hidden.

The dots become more numerous as the progressive rendering adds more passes, and only seems to appear with environment fog turned on.
It also appears when I switch off the GPU for rendering, but it doesn't seem to appear when i use vraynext instead of vraynextGPU

Anybody any ideas, this is a new one for me.

[kosso_olli]

Is the pixel value of these black spots something weird or even negative?

[Miro]

Can you share the scene to support@chaosgroup.com with a link to this thread and we'll check it out.

[Tycane]

@kosso_olli

I checked, here is the result, doesn't look great.

@ miroslav.ivanov

Great!, I sent it over, thanks for taking a look, cause i'm stumped.

[kosso_olli]

I had this a number of times before. There is nothing you could do, this is a V-Ray bug. To me it always happened either on reflection pass, or specular pass.

[Vizioen]

Had this issue too in the past with vrayenvironment fog. Stopped using it altogether.

[Tycane]

I hope they can figure it out, luckily its only in GPU and not in normal vray, will just take a lot longer to render

[Miro]

I looked at the scene and here it seems to be happening in hybrid mode only. Can you check if it’s the same story on your end?

[Tycane]

Well then, that seems to work, hadn't tried that.
When the progressive render is solving in only GPU in the first few passes it throws up bright green fireflies, but then after the 200th pass or so they quickly fade out.
Just using cpu gives a lot of black dots..

Would still be nice if it didn't do that, any idea why this happens?

But can definitely work with this!
Thanks!

[Miro]

I'm not sure so I've logged it as a bug for our dev team to look at and I'll post here when we have news.
The reference ID is VGPU-3895

[Muhammed_Hamed]

Any news on this issue?
I'm having the same behavior now with VRscans using Vray Next standalone
It only happens with hybird mode

[Miro]

Muhammed_Hamed Nothing yet, sorry. The issue is still open, but I'll let you know when we have updates.

[Miro]

Muhammed_Hamed This has been fixed for a next V-Ray service pack.

[Muhammed_Hamed]

Miro Thanks so much!

[GregCooper]

This issue appears to be back