Sometimes when artist generates normal maps from hi-poly model to low-poly, maps don’t come out right. xNormal has solution for that called “cage”. Cage is just like low-poly model (same amount of vertices/edges/polys) but it’s bigger in volume (it is kind of offset outwards from original low-poly model).
Is there an easy way to create outwards offset copy of original low-poly model other that pulling each vertex manually?
here are some link on that subject: