ZBrush Normal Map making

Actually it was started from zshpere, but I adjust meshes in 3DSMAX.

It's a simple practice, and I did some mistakes while dividing meshes

So, I re-unwrap the UV after carving.

 Carved enough for normal map 

Using normal map tool in ZBrush to export Normal Map

Note: when it was exported, Y axis would be flipped

test the normal map in Unity