using the built in zbrush models I can create displacements and then us tool>masking.create cavity map, then I can hit the create alpha button. All good.
This does not work with imported .obj files.
What do I do to get it to work?
sounds like you need UVs for your meshes
tool>uv map> pick a size, and then a type of unwrapping, you should be all good.
It has UV’s before importing…
Is there a way to “activate” them?
Okay my bad…I imported from another file before redoing the UV’s