I tried to bake AO with the default settings and it yielded strange results. it gives some dark spots as shown in the images. The only thing I changed is to "use low poly mesh as high poly" and size to 2048.
Ps. I'm only using a high poly mesh (around 1 million points), as I couldn't find a nice way to obtain a low poly mesh out of a high poly one in ZBrush. I used the decimation master but the normal map generated was very messy for some reason, so I gave up using the low/high poly workflow as I'm only interested in a static render and my system could handle it well enough.
I'm fairly new to SP and ZBrush. Not using a low poly mesh could produce those artifacts?
Thanks in advance.