Omg guys, I just found a way that works and looks much better than my old egg mask method and can be used with @guest.r 's shader, and probably all the others! Zero brightness lost 
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The humble Gaussian function has been paying dividends for me. There is something very naturalistic about it and you can compound it together over and over and it won’t ever lead you astray with weird effects like ringing or halos. It’s also relatively cheap if implemented correctly.
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