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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.
0 by default. Enabling it causes the game to freeze (tested for until about 10 minutes). Will managing to enable it make parallax maps work?
"$parallaxmap" <texture path> "$parallaxmapscale" <float> // Scales the $parallaxmap Y value by this amount