Is transmission / subsuf scattering working correctly?

[Suthriel]

@MostHost_LA

Doesn’t quite seem like the same issue. Sub surface scattering is managed on characters by an opacity texture, which is where the issue comes in.
plug a linear gradient into the materials, and see what happens for you.

If it were to work you would get a gradient effect for the scatter.
As you have it, scatter should just be applied to the whole item - which it is even if it doesn’t work right.

Well, in the RTX scene absolutely nothing happened. The gradient (plus an added multiplier with a parameter) gets completely ignored on both the sss and two sided foliage. In the Non-RTX scene, it works as the doc describes, the mask/opacity input is there to regulate the strenght of the subsurface scattering for different regions and it have a clearly visible effect.