$alphatest: Difference between revisions
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{{MatParam|$allowalphatocoverage|bool|Creates translucent steps based on alpha values. Can be used for softer edges. This parameter is incompatible with <code>$alphatestreference</code>. | {{MatParam|$allowalphatocoverage|bool|Creates translucent steps based on alpha values. Can be used for softer edges. This parameter is incompatible with <code>$alphatestreference</code>. | ||
{{warning|MSAA must be enabled in order for this to have an effect.<br>The granularity of the steps is dependent on chosen amount of MSAA; 2x MSAA will have fewer translucent steps than 8x MSAA.}} | {{warning|MSAA must be enabled in order for this to have an effect.<br>The granularity of the steps is dependent on chosen amount of MSAA; 2x MSAA will have fewer translucent steps than 8x MSAA.}} | ||
{{modernImportant|Alpha to Coverage works best with when the alpha channels of mipmaps are sharpened in a specific way; {{vtex|4}} does this by default, {{VTFEdit|4}} does not.}} | {{modernImportant|Alpha to Coverage works best with when the alpha channels of mipmaps are sharpened in a specific way; {{vtex|4}} does this by default{{cn}}, {{VTFEdit|4}} does not.}} | ||
{{note| At maximum MSAA Level (Tested in {{src13|2}}) there are 7 transparency steps. ( 9 if you include fully Opaque and fully Transparent )<br> | {{note| At maximum MSAA Level (Tested in {{src13|2}}) there are 7 transparency steps. ( 9 if you include fully Opaque and fully Transparent )<br> | ||
The levels should roughly be arranged as such:<br> | The levels should roughly be arranged as such:<br> | ||
Revision as of 19:30, 6 January 2024
$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
VMT example
Additional parameters
Comparison
$translucent |
$alphatest
|
|---|---|
Notice how the $alphatest right circle hardly changes.