Terrible Colorful Noise in Rendering results

[yi_xiang]

Hi, when i using Vray GPU5 default present, some strange colorful noise will appear, then i found that when Vray sun light go through a box which is not receive and cast shadows, the noise will appear. But if i switch back to Vray 5 CPU mode, even i did not change any other set up in the scene, the noise will disappear.

Is some of my set up go wrong? I using Vray 5.00.05, Core I7 10700k, RTX 3090 and 64G RAM

[yi_xiang]

Also, VrayDomeLight will cause the same problem in some case when i still use Vray5 GPU.

[hermit.crab]

Is the noise present in a saved image? Check if you have 'Force color clamping' (in the VFB2, View>Color clamping) disabled.

[yi_xiang]

Is the noise present in a saved image? Check if you have 'Force color clamping' (in the VFB2, View>Color clamping) disabled.

It's definitely disable, i have lots of overexposure area in the image, i will show you the different between Force color clamping able and disable.

[yi_xiang]

Something interested me is that color value of the pixel in noise are less than 0. But it shows red or blue color.

Actually, I had goose bumps when i saw these noise LOL.

[hermit.crab]

Can you attach the scene here or send it to support@chaosgroup.com so we can investigate? If writing an e-mail, mention this thread along with your host platform version.

[Joelaff]

What do you have the texture depth set to for GPU in the target settings?

Do any of your textures have an alpha that is not within 0-1.0?

[yi_xiang]

Can you attach the scene here or send it to support@chaosgroup.com so we can investigate? If writing an e-mail, mention this thread along with your host platform version.

I've sent the email.
Thanks.

[yi_xiang]

What do you have the texture depth set to for GPU in the target settings?

Do any of your textures have an alpha that is not within 0-1.0?

I think i did not, all i have do is making a box which don't receive and cast shadows, if i delete it, everything seems OK.