$alphatest

$alphatest is a material shader parameter avaliable in all Source games. It specifies a mask to use to determine binary opacity. White represents fully opaque, while black represents fully transparent. Any values in-between are rounded to either 0 or 1. This effect is similar to $translucent, except that it can not be semi-opaque, is much faster to render, and the engine can sort it properly when layered.

Syntax

$alphatest <bool>

VMT example

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LightmappedGeneric { $basetexture "glass\window001a" $alphatest 1 $alphatestreference 0.5 $allowalphatocoverage 1 }

Additional parameters

$alphatestreference

$allowalphatocoverage

Comparison

$translucent	$alphatest
Original image, rendered with $translucent	Animated preview of the same image, but with $alphatest. The first image shows the effect of $allowalphatocoverage 1. The rest show alphatest with $alphatestreference ranging from 0.1 to 0.9

Notice how the $alphatest right circle hardly changes.

See also

• $alpha
• $distancealpha
• $vertexalpha