ok. Coincidentally I have a zbrush question today, so I'll drop it in here....


Mask by Cavity

Not something i've used loads...but have done a couple of times recently and found it really handy for helping to produce an overlay/multiply colour map to help accentuate the details in my normal maps.

But...Im sure some of you will have come across this before....on a couple of models ive had recently, and my current one...when i click 'mask by cavity'...it masks the entire model. Rather than that camo-like look it usually produces when it works how you'd expect. Ive tried playing with the intensity of the cavity - -100 all the way up to 100, and played around with the cavity curve....but I still cant get a mask that isnt either nothing masked at all...or everything masked entirely. Its not like my model doesnt have any cavities.
Are there any reasons people know of that stop zbrush producing good cavity masks on certain models?