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Autodesk Standard Surface Thin Walled no SSS AOVS?

Unread postPosted: Wed Oct 06, 2021 11:13 am
by machieb
Hello,

I have a question regarding SSS and AOVs.
When enabling "Thin Walled" on the autodesk standard surface shader the AOVs pbr_subsurface_k, pbr_subsurface_i_direct and pbr_subsurface_i_indirect are black. When disabling Thin Walled on the autodesk standard surface shader they are as expected.
Is that a limitation?

I have trees and grass geometry that has no thickness and want to use SSS and get the SSS AOVs.

Thanks Marcus

Re: Autodesk Standard Surface Thin Walled no SSS AOVS?

Unread postPosted: Wed Oct 06, 2021 2:02 pm
by Lucas
Hey Marcus,
SSS by definition only works with volumes/closed surfaces so actually when using Thin Wall and SSS, the SSS is faked as Transmission Diffuse.
You can get the AOV by using a custom LPE like : C<TD>+L

Re: Autodesk Standard Surface Thin Walled no SSS AOVS?

Unread postPosted: Wed Oct 06, 2021 3:05 pm
by machieb
Thank you very much for your fast answer.
I will try the LPE.

Cheers Marcus

Re: Autodesk Standard Surface Thin Walled no SSS AOVS?

Unread postPosted: Thu Oct 07, 2021 6:22 am
by sam
You can also use the builtin pbr_diffuse_transmission using the AOV editor

Re: Autodesk Standard Surface Thin Walled no SSS AOVS?

Unread postPosted: Fri Oct 08, 2021 9:03 am
by machieb
Thx Sam!