This link shows the steps Disney goes threw to render realistic cgi eyes. first off they start off with an actual picture of an eye so they can get the shape and size right, next they recreate the sclera which is unique to each eye. next they reconstruct the cornea even know it is transparent. next the iris is constructed threw the cornea , showing fine details on the iris's surface. last they add all of the steps together and add in colors and details. they also add in different lights and glossiness to make the eye look more realistic.
I found this link super interesting, all of the steps that's must be done to make an eye realistic looking. Disney is now able to make eyes look really realistic even being able to show how eyes react to different types of light with dilating pupils. until now Disney had to estimate how the eyes looked and were shaped.
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