I am not an expert, but doesn't the workflow normally go the other way? That is create the low poly mesh in maya or zbrush, then subd to a bazillion polys in the sculpting app, then generate the normal map of the high poly sculpt, and then send the normal maps (and the base 0 mesh if you created it in the sculpting app) back to maya?
I have also seen where the sculpt program is used to down rez, by hand painting polys onto the high poly mesh, but I don't recall seeing anything about down rezzing a high poly sculpt inside maya.
But I am not a sculpt modeler so I apologize if I am speaking out of my butt.
"If I have seen further it is by standing on the shoulders of giants." Sir Isaac Newton, 1675
Last edited by ctbram; 10-12-2010 at 02:01 PM.