|Pros|Cons| |---|---| |1 Manifold object, 1 Material, No clutter|Can't change pupil size| |100% Real-time, BGE friendly|Low res (not for close up viewing)| |Colorable iris|Inaccurate reflections around eye's cornea| |Iris refraction|Cornea is sensitive to any geometry deformation|
Real-time eyeball with faked reflections and iris refraction. Big thanks to Binary on Blender Artists for his amazing IBL node setup, thanks to which I was able to get object space reflection mapping. Also thanks to proxe here on Blendswap for his awesome CC-Zero Eye Texture Pack.
I'd like to credit the author of the enivronmental equirectangular church image, but I can't figure out where I got it, since I've had it for a very long time. If anyone knows who made it, I'd appreciate if you told me so we can credit the author.
Note: If you've put the eye into your scene and the textures are glitching out for you, be sure to turn off World space shading under the shading options panel.