Is the SSS in v9 an entire shading model or just a surface aspect?
Actually, there are two SSS shader implementations and four SSS materials in v9. Each is an entire shading model, and all have a variety of choices to let the user determine how to balance the look and the level of effect desired versus render time. Two of the materials are specialized for skin – FastSkin and SimpleSkin. All, however, can be adapted to produce a wide range of effects.