Substance Painter Shader - Unreal Engine 4(update)

A little update : filtering(de-noise) should properly work with any env texture size now
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Hey folks! I've just found an outstanding solution for a noise problem, the idea is to read mips for low-probability samples, it worked surprisingly well:

this method was used in Frostbyte 3 engine games later SW Battlefront and described in [Lagarde2014] and GPU Gems 3

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