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what does phong exponent texture do?

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what does the phong exponent texture do?
what is it suppose to do?
how do they work?
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    $phongexponenttexture <texture>
    A global exponent value, or a per-texel exponent texture map. In an exponent map:
    • Red channel: Exponent (size of highlight, 0-255, where a value of 0 is a large highlight, 255 small.)
    • Green channel: Albedo tint (if $phongalbedotint 1, higher is more tint)
    • Blue channel: Nothing
    • Alpha channel: $rimlight mask.
     Note:LightmappedGeneric and WorldVertexTransition do not have support for $phongexponenttexture. You must use $phongexponent instead.

    https://developer.valvesoftware.com/wiki/$phong
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