# Patch based world

Per patch we have:

  - tiles
	- water plane
	  - with clickable area

A world consists of a fixed amount of tiles in x and y direction.

Patches are used to stream the world in and out.

# Cross-patch island generation:



# Shaping under water tiles:

for each tile of an island:
  - create inside set I:
	  - add all island tiles to I
	- for steps i = 0, ..., n:
	  - create empty rim sets RI and RN
		- for all tiles in I:
		  - for all neighbours of tile:
			  - if neighbour not in I -> add tile to RI
				- add tile to I

		- for all tiles in RI:
		  - get all neighbours of tile:
			  - if neighbour not in I -> add neighbour to RN
	  - for all neighbours not in I
	-