Check out the ZRemesher in ZBrush for retopology on the tree. Then your process can be like 1. Sculpt 2. Export High 3. ZRemesh 4. Export Low & UV 5. Bake your maps
I've finished retopoing the tree now. Well, I actually abandoned the retopology tools half way through and modelled it the old fashioned way :D Here's the result I gathered more ref and now I've started to sculpt it in zbrush. Again though, this is the first time I've sculpted a tree, so if anything seems a bit weird or…