I've just recently started to follow a game design course and we've started to tinker with ZBrush for hiPoly-to-normal-map baking. We're not supposed to try sculpting, yet, as we're still at an early stage with the lessons....but I just couldnt wait!!
Basically, this is the workflow:
.: LowPoly model w/ UVs in Maya
:. Import lowPoly into ZBrush, subdivide and sculpt
.: Bake normal map from hiPoly and export as PNG
:. Splat normal map onto lowPoly in Maya
Well, let's just skip all the problems I've encountered with understanding ZBrush's quirky workflow *sigh*; now I'm having problems with baking the normal maps.
My teacher told me to use the "Crease" function to maintain certain edges during subdivision, so that they wont get eaten away by the smoothing process. And it works, it really does, but now it seems this thing is also compromising my normal map output.
What I get (or rather dont get!) is that all the faces around the creased edges are missing, in the normal map. The quads around the creased edges are, like, completely ignored!
I tried to "UnCrease All", but I get the same result: [ https://ibb.co/mFHTgS
See the missing teeth and that flat stripe around the temples? It's soooo frustrating! >.<
I've also tried to use XNormal, but the output is....<unusable>, to use a euphemism. I get odd squares in place of the object's details, or I get the right-ish figure but with improbable colors (and still missing strips of details!).
And the funny thing is that I cant tell which settings result in one outcome or the other!
Personally, unless XNormal produces way better normal maps than ZBrush, I'd rather use the latter to bake them. It would mean one step less in my still-evolving-workflow.
Ideally, I would like to have a steady, standard workflow that works independently of what I'm modeling/sculpting. A man is allowed to dream, after all.
Anyway: crease = no normals. Why?!
I've tried googling for hours, but it seems I'm the first human being on this planet that is facing this issue. My luck!
Thus here I am.
Any help, hint and suggestion is very welcome. Thank you!
PS: this is my third sculpture (and third skull too!) EVER. Please be kind with your comments. ^^'