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Apologies in advance for not being clear. I'm still trying to define this problem.
I'd like help with a "forest fire" algorithm to support sandbox generation. Suppose you have a large hex-in-hex map. These hexes are numbered (let's say 1 to 100) and they are adjacent to others based on their placement on the map.
Now let's suppose one of these hexes is on fire. You'd like the generator to create a larger area of fire, based say on strength of the initial fire. I'm thinking perhaps Hex A has a chance to set adjacent hexes on fire, which then may spread (but not forever). How might you do this?
Forest fires are one application: a working algorithm could also be used for things like area of influence around an orc nest, direction and length of streams or small rivers or roads in a 1-hex-per-mile map, etc.