Eyes
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This article is about the older shader. For the succeeding shader, see EyeRefract. For the QC property of $model, see Eyeball./ For the tool, see qc_eyes.

Alyx's eyeball in Episode Two, using this shader.
Eyes
is a Vertex shader available in all Source games. It creates character eyes by defining a white sclera texture and an iris texture to be drawn on top of it.
Parameters
$basetexture
$iris
$halflambert