$alphatest: Difference between revisions
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{{MatParam|$alphatestreference|float|Specifies the minimum color value of the alpha channel in which the effect is rounded to 255. A value of ".3" will create a thicker shape while a value of ".7" will create a thinner shape. | {{MatParam|$alphatestreference|float|Specifies the minimum color value of the alpha channel in which the effect is rounded to 255. A value of ".3" will create a thicker shape while a value of ".7" will create a thinner shape. | ||
: {{bug|<code>$alphatestreference</code> cannot be updated in real time with [[Material_proxies|proxies]].}} | : {{bug|<code>$alphatestreference</code> cannot be updated in real time with [[Material_proxies|proxies]].}} | ||
: {{Tip|This limitation can be circumvented by using $alphatestreference 1, and modifying the <code>[[$alpha]]</code> value instead. (requires $alpha to be raised above 1, its normal threshold, this may cause sorting issues)}}}} | : {{Tip|This limitation can be circumvented by using $alphatestreference 1, and modifying the <code>[[$alpha]]</code> value instead. (requires $alpha to be raised above 1, its normal threshold, this may cause sorting issues)}} | ||
: {{Tip|For [[VertexLitGeneric|VertexLitGeneric]] on models you can use <code>[[$detail]]</code> with <code>$detailblendmode 3</code> and modifying the <code>$detailblendfactor</code> value. Detail texture must be a copy of <code>[[$basetexture]]</code> with a different alpha channel.}}}} | |||
{{MatParam|$allowalphatocoverage|bool|Creates transparent steps based on alpha values. Can be used for softer edges. This parameter is incompatible with <code>$alphatestreference</code>. | {{MatParam|$allowalphatocoverage|bool|Creates transparent steps based on alpha values. Can be used for softer edges. This parameter is incompatible with <code>$alphatestreference</code>. | ||
: {{note|MSAA must be enabled in order for this to have effect.}}}} | : {{note|MSAA must be enabled in order for this to have effect.}}}} | ||
Revision as of 16:52, 4 April 2022
$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
LightmappedGeneric { $basetexture "glass\window001a" $alphatest 1 $alphatestreference .5 $allowalphatocoverage 1 }
Additional parameters
$alphatestreference
$allowalphatocoverage
Comparison
$translucent |
$alphatest
|
|---|---|
Notice how the $alphatest right circle hardly changes.