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OrnluWolfjarl -> RE: How much rainfall on a single hex usually results in a forest appearing? (1/31/2021 10:23:07 PM)
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Oh wow, I didn't know that CO2 was a factor. I expected as much for temperature though. Temperature also seems to affect the appearance of Cloud Forests.
I've run a few experiments since posting this with saves that I had left unfinished when I was learning the game.
It seems that Forests will usually appear on hexes that have 300+ Rain and at least 15 degrees temperature. That's individual hexes, not overall rainfall as appears on Surface generation stage.
Anything over 400-500 will usually generate Cloud Forests, if the temperature is also over 25 degrees. Otherwise it generates Heavy Forests.
Between 200-300 and 20-30 degrees it can generate a Savannah.
Anything of less than 200 will likely turn out to be Grass or Bushes, and anything under 100 will vary between Grass and Rocky Plain.
I've found that Farmland hexes generated by open air farms (Earth plants) can be used to terraform Forests and Cloud Forests. However, the hexes will appear very slowly if rainfall is less than 300. More rainfall generates faster terraforming. Since you mention CO2, I'm guessing that can also have an effect.
Farmland can also be used to terraform Rocky Plains. However, since these generally tend to have very low rain values, they only tend to work with Alien plants, and even then, they tend to be quite slow.
The Defense value of trees (as seen in Auxillary info during planet generation) seems to impact the rate of terraforming. I suspect it is so, but I couldn't prove it conclusively, since I didn't feel like going through many more planet generations.
(By the way, I'm glad to see you just posted your 1999th post here zgrssd. I find the number funny :)
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