Quick test on DiggerPro (unity asset store)
Super quick test.. Notes:
That example camera controller seriously needs Lock Cursor toggle!
Otherwise it seems ok and cool how it keeps original unity terrain (only builds voxels at the modified parts). Sample settings are way too sensitive for digging and the help textbox is unreadable (unless stretch inspector half screen width) Pro version supports Runtime editing, the regular version is editor only i guess?
Pro version: https://assetstore.unity.com/packages... (referral)