EyeRefract
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This article is about the shader. For the preceding shader, see Eyes. For the QC property of $model, see Eyeball./ For the tool, see qc_eyes.
EyeRefract is a Vertex shader available in all 
Source games since 
Source 2007. This shader is a successor to the Eyes shader from Source 2004. Like it, EyeRefract is used to create life-like eyes, with more realistic shading, cornea parallax, and a wider set of supported effects than Eyes.
Bug:Although this shader has support for $emissiveblend, it is not fully implemented and does not work properly. [todo tested in ?]Bug:The shader doesn't work in 
Counter-Strike: Global Offensive, where eyes are always directed to the map's center. Standard models use static eyes. [todo tested in ?]
Confirm:is this just CS:GO, or is it all CS:GO engine branch games?Bug:On Source 2013, it's been observed to cause issues when used in scenes with expensive water, causing flickering and tears or disappearing of the water itself. It is advised to stick to the more stable Eyes shader, unless you're sure you can avoid these issues. [todo tested in ?]Shader Parameters
$iris
$irisframe
$corneatexture
$corneabumpstrength
$parallaxstrength
$dilation
$lightwarptexture
$envmap
$glossiness
$ambientoccltexture
$ambientocclcolor
$ambientocclusion
$halflambert
$raytracesphere
$spheretexkillcombo
$eyeballradius
Other Parameters
$eyeorigin
$irisu
$irisv
$intro
$warpparam
$entityorigin
Todo: Include cloak parameters in here?
Todo: Can this shader be used outside of a model with qc eyes, by using proxies (or in SFM override materials) to modify these shader values?