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Ryzom Core uses a tailing system for the landscape. Tiles are 160 meters by 160 meters and define a basic element you can place on your universe. Then you can create the universe by painting with the mouse.
Display collisions
You can see the server collision. Blue means the space is available and red show the borders. The small circles on the following screenshot are the trees.
Display PACS collisions
You can also see the PACS collision that is used on the client side to detect collision. It uses some detailed geometries to have exact collisions. The system use contour line based on the altitude of the map. Green contour means the player can pass, red lines are collisions.
Place objects
Place zones
Place AI
Place raw material (deposits)
Create missions