Subsurface Profile Materials do not Respect Opacity

Setting a material to subsurface profile causes it to stop respecting the opacity value when applying subsurface scattering.

Repro steps:

Create a subsurface profile material with a valid subsurface profile.
Assign to a mesh and place the mesh under a bright point light
Assign a constant of 0 to the opacity input of the material, and note the appearance of the mesh.
Assign a constant of 1 to the opacity input of the material, and note the appearance of the mesh.
There is no difference.

Because of this bug, it is impossible to mask the subsurface effect to limit it to only parts of the material.

Hi BlackRang666,

The opacity input is used with Translucent Blend Mode. Did you make sure to set the Blend mode of your material to Translucent? When I try to reproduce this issue using the steps you provided, it is working as intended.

Not accurate.

Hi BlackRang666,

Thanks for providing that link. I was able to reproduce this bug and I have logged JIRA UE-51569.

Our developers will be investigating the issue further. Please follow that link to monitor the status of the report.