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ParallaxTest is an unfinished shader since Alien Swarm (although not available in SDK 2013) which draws parallax mapping on an albedo. Alternative to the disabled $parallaxmap shader parameter. Accepts only a $basetexture, of which the alpha channel is used as the heightmap.

Successful implementation, by placing a surface using Modulate shader, to fake lightmaps ontop of the otherwise fullbright parallax mapped texture. Click to see animated preview.
Bug.png Bug: The material will always be drawn unlit.
Note.png Note: There's a workaround for this bug, as lightmaps can be faked with Modulate shader

To do: Document/test more of this shader!

The texture scale in hammer seems to correspond to the depth of the parallax effect. Higher scale -> deeper parallax. Models with this material will rendered invisible.