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Custom texture mipmaps for roughness

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Found this very helpful. I've also enabled the EXT_shader_texture_lod extension (as Webgl doesn't support textureCubeLod) and I now use textureCubeLodEXT instead of textureCube with a bias. I've taken a look at the default shader and I think it would be better to also use textureCubeLodEXT instead of textureCube for roughness. textureCube creates artifacts and changes with distance. 

more info here: @Deltakosh

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