No the trees are not procedurally generated. They were made in ZBrush, then placed individually.
However we have since updated them, you can see the updated versions on our newer pictures.
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LordSmash - - 2 comments @ Player Camp
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LordSmash - - 2 comments @ Elyot and the Island Of Pongo
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Long delayed response here. Thank you for the well wishes. I'm fairly certain this was filmed in Unity, but to be honest I can't quite remember anymore.
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LordSmash
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