Okay, I’ll be quick here to say that unless SSS backscattering is reworked to be able to work on every face in every direction with unlimited lights, certain gas effects like a gas explosion I’ve been working on will remain impossible to do in a way that doesn’t involve faking or really cumbersome object setups to make up for it using dupliverts.
I like the SSS, but the limitation that backscattering only works front to back and not in all directions with all faces is a serious limitation, it makes good VFX work using good SSS techniques next to impossible unless you want faked node setups or other cumbersome setups. Even creating the humble candle falls victim partially to this.
An SSS system like this makes Blender technically still without SSS that looks a lot like a G.I program. I hope the Peach team is aware of this, I’m sure many would like this limitation removed.
To prove what I’m talking about make 4 cubes that are part of the same object, put an omni light in the middle, and set SSS.
EDIT: About faking with nodes, I suppose you can try to make an entire SSS algorithm using lots of vector curves and math nodes to mix in an emit texture, but then you’d have to be a math genious and I don’t even know trigonometry.
ALSO: If you remove the limitation and make it optional, I don’t care if it’s twice as slow with it on but for certain things this is critical.