World of Warships uses photo-sourced panorama textures for its skies, which means the sky never changes as time or location changes in the game. So what they do then is use the same panorama texture for environment reflections, which is very fast as all you have to do is sample a 6-sided cubemap. I used the same technique when I did the water in Atlantic Fleet. The thing about reflections and why everybody makes their oceans very reflective simply boils down to 'because it looks better'.
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