$desaturatewithbasealpha

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January 2024

$desaturatewithbasealpha is a material shader parameter for the VertexLitGeneric shader available in all Source games since Alien Swarm.
Setting it to a value above 0 will enable the behavior.
If used, the $basetexture's Alpha channel will be used as a mask to de-saturate the $basetexture's Color.
The amount of desaturation is determined through the same parameter. 1.0 will result in 100%, and 0.5 in 50% desaturation.

Todo: Is this available since ?

Note:Also available for use in and through LUX

Caveats

Bug:This Parameter does not work with

• $seamless_base. (this works in )
• $detail. (this works in )
• $bumpmap or any parameters that requires a $bumpmap. Including $lightwarptexture. (this works in )
• $selfillum and thus $selfillummask (this works in )
• $selfillum_envmapmask_alpha. (this works in )
• $basealphaenvmapmask. (this works in )  [todo tested in?]

Warning:Using the Basetexture's Alpha channel for other effects at the same time might result in unexpected behavior!