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The $parallaxmap VMT parameter specifies the VTF texture to use for the 'sub-vertex modeling' or parallaxmap of the material surface.

Warning: Parallax maps are disabled in every Valve game, although since <Alien Swarm> 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

See Also