I think it would be hard to implement fog of war in a full 3D game .
Many players would (rightfully) complain if the view distance is short like in some old games.
what could be done maybe:
- You cannot move the camera very far away from your char. You can click on the map to send characters far away but the camera does not scroll to this position and stays with the player.
- You cannot see whats inside a building or another room if the door is locked. When interacting with a door you can try to open it or try to make a perception check to hear whats inside.

Prof. Dr. Dr. Mad S. Tist

World leading expert of artificial stupidity.
Because there are too many people who work on artificial intelligence already