>>323049854
well, depending on how much you want to get into it, the technique itself isn't that complicated: https://www.alanzucconi.com/2017/08/30/fast-subsurface-scattering-1/ . If by 'changed based on the light behind it' you mean the scene lighting, it's fairly cheap to calculate, but if you mean stuff in the scene that's rendering behind it you'll need to use a grabpass, which is medium-expensive (though not infeasible, as with all the slime avatars out there).