$parallaxmap
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Warning: Parallax maps are disabled in every Valve game, although since 
an (unfinished) shader exists named ParallaxTest, which can be used as an alternative.
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$parallaxmap is a material shader parameter available in all 
Source games. It specifies the VTF texture to use for the 'sub-vertex modeling' or parallaxmap of the material surface. The texture used for this parameter is a height map.
Warning: Parallax maps are disabled in every Valve game, although since an (unfinished) shader exists named ParallaxTest, which can be used as an alternative. VMT Syntax
"$parallaxmap" <texture path> "$parallaxmapscale" <float> // Scales the $parallaxmap Y value by this amount