Volumetric error

[larry.vasquez]

I'm using 'V-Ray Environment Fog' with a Directional Light set to Physical Sun & Sky. But I'm getting a some type of shadow in the upper right corner of the render and there isn't anything there

[boyan]

Hey, Larry,

Thank you for the post, Yes, this came from Sun - directional light. We have this one in our system, anyway as a workaround -- Increase the "Size Multiplier" option to a value of 100 for example.

Cheers,

[larry.vasquez]

Thank you Boyan. Keep up the great work with the Modo version.

[larry.vasquez]

P.s. the only problem I have when I up the Size Multiplier on the Direction Light is that I lose the 'God Rays' that I'm going for.

[boyan]

Well, thank you for the feedback, as a workaround -- I think, you have to use 2 "Direction lights" (the rotation channels of the second one is linked to the "SUN") one for env. fog and SUN. BTW, If your scene file is suitable for V-Ray GPU, the behavior is not reproduced on GPU.

Cheers

[larry.vasquez]

Thank you Boyan. I'll give that a try.

[Chabb]

That's probably too late, but I had the same artifacts with VRay Next when using similar setup (V-Ray Environment Fog with a Directional Light set to Physical Sun and Sky).
It looks like something invisible is clipping the Fog and this artifact is camera-angle-dependent, also only appears after applying Physical Sun and Sky to Directional Light.
Also the godrays I was trying to create were barely visible and only at the top edge of a Fog (with Height specified) and completely invisible when camera was inside the Fog.

I found that disabling "Bumped normal check" in Directional Light was enough to fix the issue. Is it safe to disable?

[boyan]

Hey, Chabby,

Thank you for the post. If you don't have a reflection bump visible to the camera you can disable it indeed. Otherwise, this will affect the whole render.

Cheers,