Quote - > Quote - Displacement is also limited to deforming a surface along its normals, so the types of baked deformations would be limited.

stewer (Stefan Werner - SM's maintainer of Firefly) told me that Firefly displacement is actually 3-dimensional. It accepts a vector, much like normal maps do. But only a simplified form (equivalent to bump mapping) was exposed in the material room.

I'm not 100 % sure about this, it's been several months since I saw the thread at DAZ...

In DAZ Studio normal maps can be used to control the direction of displacement. I.e. you'd use a regular displacement map and a normal map together. I don't remember exactly how this works; I don't use DS so it was just a curiosity quickly (almost) forgotten.