I create a Rock with Zbrush , I retopoly it with 3Ds max. next step , I UVunwrap lowpoly mesh complete . but I dont know how i can use UV (lowpoly mesh ) accept to highpoly mesh . So I want use highpoly mesh make NormalBump + ambient Occlution . I know it with zbrush . but I don’t want use zbrush make it . I want it with 3Dmax and mental ray
When I was learning how to do this I found this website:
http://www.poopinmymouth.com/tutorial/normal_workflow.htm
Hi there!
You can always use xNormal too. Best tool there is 
Basically, you just export your low- hi-res meshes from 3dsmax import them into xNormal for baking. Works like a charm!
Roald
What a coincidence… just saw this found this tutorial while browsing cgtalk earlier today:
http://eat3d.com/free/xnormal_overview
Should explain how stuff works pretty well