Time ago, I created an eye shader to work with offline render like Renderman, Mental Ray and Arnold.
Now the unreal version is FREE for comercial use - Creative Commons CC0, but If you have the means I'd appreciate any donation, even if it's $1, just for the coffee ;)
Right now Real-Time render has been using for production short-films and visual effects, with this shader you can create a big variety of eye configuration very easy.
I hope you enjoy :), any comments are welcome.
Features:
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Cat eye effect.
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FULL procedural, you can change the look of the eye in a few minutes (size of the iris, size of pupil, size of border eye and others).
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Can create an eye with the color that you want.
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Can apply texture to the iris, sclera and pupil, template is in the package.
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Clean Geometry.
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If you want, you can't use texture and use only color for cartoon characters.
NOTE: It needs to activate the "Clear Coat Enable Second Normal" to work properly.
Compatible with Unreal +4.15.