Not sure how it could be used within a subsim though, i have physx enabled on my desktop pc, so far the only game ive found that uses it is batman:aa and all it does there is add a few more physics enabled objects rattling round the environments.
I guess it would be cool to have stuff rolling around the interior of the boat in heavy seas, cupboards opening and spilling their contents etc... but frankly that could be done easily enough with good old havok, no need for and fancy hardware solutions.
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