Hi,
There are potentially several things at play:
- Shadow map type: What type of shadow are you using? SM/VSM/RT? In your 5.0 / 5.1 comparison are you using Virtual Shadow Maps in both cases (vs. regular Shadow Maps)?
- Thickness: The thickness evaluation, used for computing the light transmission for ‘diffused’ SSS (i.e., SSS Diffusion or SSS Profile Diffusion) it not handle similarly for the Profile vs. non-profile version. The profile version will use the SSS Radius, while the non-profile version will use its ‘max’ MFP value. This is an known issue on our side that we need to address.
- Type of light: Does this happen for both local light and directional light? Or just with local light? We could be missing some logic on point light.
Thanks.
/Charles.