IPhone 4's display also saw an upgrade to "retina display", featuring an increase pixelcount making individual pixels invisible to the human eye.
iPhone 4的显示屏也升级为“视网膜显示屏”,增加了人眼无法识别的单独像素的密度。
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Adjust pixel light count in quality Settings. Essentially only the directional light should be per pixel, everything else - per vertex. Certainly this depends on the game.