I just need to know that when you make the water; can you add vertices and faces to the model and then apply the material? or do you have to make a new plane and rename that to the water material? same thing for waterfalls.

Offtopic:
-What is the material name for breakable glass? coz im making the player having to get on a cliff edge and to get there the player has to move through a crashed pelican and shoot the glass to get on the cliff edge.