$masks2

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$masks2 is a material shader parameter available in Counter-Strike: Global Offensive Counter-Strike: Global Offensive. Used in Character (shader). It specifies various lighting effects in each of the 4 layers.

The purpose of each layer is:

Red channel - Shadow saturation mask
Green channel - Angle and Amount of Anisotropy
Blue channel - $envmap light scale
Alpha channel - Retroreflectivity