I've just implemented a (hexagonal) DOF effect into our game :
(as always, click to view in full resolution, you can't really see the effect in the downscaled picture)
The DOF effect looks good. The only thing, I do not like in this scene, are the bright lights in the background. They do not look blurry enough. The border of the lights in the foreground (left side of the screenshot) looks much smoother than these bright lights in the center of the screenshot.
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