hello !!! I have a polymesh sphere, ready to sculpt, and behind it, via the floor in z, a front reference image… The problem is that I need, to match the reference, to work on a seùmi opaque sphere, to see behind it the image… but “ghost” or “thansparencie” doesn’t work, the sphere hide the reference… Thank you for your advice!!!
Hi marcel, 
You need the Fill Mode slider in the Draw palette (next to the Floor button). Set it to 3. You can read about it here:
http://docs.pixologic.com/user-guide/3d-modeling/reference-images/grids/
HTH,