I don't think it is as simple as "copying" SOW. Game development these days means that deveolpers can experiment with a lot of things. I would imagine that if you are a developer and sit around all day working on different ideas you are bound to have similar ideas to other development teams working in a similar genre.
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The grass will move in the breeze just as the trees will or so has been reported. I also suspect that, just as it is in IL2's ancient engine, different surfaces will affect aircraft in different ways.
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Brigstock
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