$alphatest: Difference between revisions
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! <code>$translucent</code>||<code>$alphatest</code> | ! <code>$translucent</code>||<code>$alphatest</code> | ||
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| [[File:Alphatest_preview_original.png|thumb|50%|center|Original image, rendered with $translucent]] || [[File:Alphatest_preview.gif|thumb|50%|center|Animated preview of the same image, but with $alphatest. The first image shows the effect of $allowalphatocoverage 1 (at 4x MSAA). The rest show $alphatest with $alphatestreference ranging from 0.1 to 0.9]] | | [[File:Alphatest_preview_original.png|thumb|50%|center|Original image, rendered with $translucent]] || [[File:Alphatest_preview.gif|thumb|50%|center|Animated preview of the same image, but with $alphatest. The first image shows the effect of $allowalphatocoverage 1 (at 4x MSAA). The rest show $alphatest with $alphatestreference ranging from 0.1 to 0.9. Click image if not animating.]] | ||
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Revision as of 21:00, 9 March 2025
$alphatest is a material shader parameter available 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, unless $allowalphatocoverage is also used. This effect is similar to $translucent, except that it can not be semi-opaque (without 
banding), is much faster to render, and the engine can always sort it properly when layered (instead of only on non-detail worldspawn).
Syntax
VMT example
Additional parameters
Comparison
$translucent |
$alphatest
|
|---|---|
Notice how the $alphatest right circle hardly changes.