Subsurface scattering /translucency render preview

Would be great being able to preview subsurface scattering and translucency, like it s possible in Substance painter.

Justification

Subsurface scattering can substantially change the look of roughness/normal maps and

Implementation Details

We don´t need full glass translucency rendering capabilities, although having that in the raytrace renderer would be nice.
Basic transparency doesn´t work well right now, even at opacity 0 the mesh still shows transparency.
For subsurface scattering it would be nice to have basic control over the depth/world scale.