V-ray Sun and Volume rendering

[Mikhalenko]

Hi. I have found very strange behavior of the volumetric rendering with sun. See screenshots. On the first and second I use intensity 0.012, and as you can see in final render clouds black, but on Light Cache I see them. On the third screenshot I sent intensity 0.015 and I see cloud on Light Cache and final render

[Mikhalenko]

I also have some artifacts in the volumetric. for lighting I use instanced light underneath volumes and 1 dome light

[Gosho.Genchev]

Hey Mikhalenko ,

regarding the artifacts - those looks like Volume Light Cache artifacts - can you try disabling that option on the Volume Shader -> Smoke tab to check if those will clear up ? If so, you can enable it again and reduce it until the artifacts disappear. There's a page in the documentation on volume rendering that you may find useful:
https://docs.chaosgroup.com/display/...ering+In-Depth

As to the first problem with the Sun intensity - is there any chance you could send the scene to support@chaosgroup.com so we can take a look? I'm out of ideas regarding that one.

Thank you!

[Mikhalenko]

Hey Mikhalenko ,

regarding the artifacts - those looks like Volume Light Cache artifacts - can you try disabling that option on the Volume Shader -> Smoke tab to check if those will clear up ? If so, you can enable it again and reduce it until the artifacts disappear. There's a page in the documentation on volume rendering that you may find useful:
https://docs.chaosgroup.com/display/...ering+In-Depth

As to the first problem with the Sun intensity - is there any chance you could send the scene to support@chaosgroup.com so we can take a look? I'm out of ideas regarding that one.

Thank you!

Hi. Just sent. Also attaching scene here. Also noticed strange behavior of the background in Environment, if it's set not pure black,when value 0.00625 for example in the render background superwhite