> Quote - > Good looking eyeball render, but I really don't understand why the iris geometry is shaped like a dish.

Thanks, and we already had this discussion several pages ago:
www.renderosity.com/mod/forumpro/showthread.php

I don't think that's going to link to the correct page though, since for me that's page 172...

Les had asked about real eye anatomy and I replied by posting this picture above and then adding this link:
images.google.com/images
Then in my next post I said,

Quote -
Actually, going by the above image it looks like the iris should be a little more convex towards the outer edges, but concave towards the center.

And the subject just kinda died there. ;-)

It was that which made me curious, so I tried the render experiment. I actually modeled a lens and put it behind the pupil, to see if I could use it to make more realistic refraction and absorption, using LW's dielectric node, since polygons have no real thickness like a cornea, iris and lens would. A pupil is just a hole, but the reason it looks dark is because the retina absorbs all light. I wanted to try to simulate that effect with refraction, and the pupil in my render is mostly transparent.