I'm still working on large-scale terrain. I decided to try a hexagonal grid rather than a square one because it seemed more natural. Plus, it avoided the awkward question of whether or not I should have water flow diagonally. Here's a screenshot. The terrain itself looks more natural, but lakes and rivers no longer form quite as easily, which I have to work on.
Here's a screenshot showing the hexagonal cells. Each vertex is one cell. The lines show the connections between them.
One thing that's changed is that the different layers can now mix together to a degree. I'm not sure if this was a good move. It's more realistic in some ways, but the results aren't quite as interesting. Feels like two steps forward and one step back. There are still a lot of things I want to add (temperature, humidity, snow and ice, plants, etc), but I'm trying to get the parts I have now working as well as possible before adding more complexity.
Interesting fact: the area I'm simulating is roughly four square kilometers, but this can be scaled up.
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