Helping Zbrush to shoot my normal map correctly?

mdeforge

What are some tips for getting ZBrush to shoot ears, or other tricky meshes, properly? I thought I was in the clear by making sure my low res mesh was detailed enough to match the high res, but apparently not. Otherwise, to my understanding, Zbrush would have to shoot rays around corners which traditionally displacement/normal maps don't do.

My displacement comes out fine. It's just the normal that is all wonky. See attached for several images.

Should I expand the high res over the base mesh further? Is this because the shells my ears are on is seperate from the head?

mdeforge

It looks like it's doing that everywhere a seam is. I recall now that shell borders do that. I'm looking around to see what I can do about that.

mdeforge

Bump

EarthQuake

Generally the key to ears is to:
A, have the high and low match up very well
B, since there is little surface difference between the high and the low, use a really short ray distance

mdeforge

Thanks EQ, problem solved.