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For projection mapping to work properly in Zbrush, you need 2 things. First... the object you are working on must be subdivided to the point that it can accept the detail you are trying to project on to it. second...your alpha brush must be high rez enough for projection master to displace it properly.
If you are trying to project onto a simple plane you will need to subdivide to to about a million pollys or more to get good detail
here is a little example I just did in about 5 min in Zbrush 2. using projection master. my tree alpha is too low res, but Zbrush has enough detail that you can see the JPG artifacts in my alpha brush.
this is 924,160 polys
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