Seeking a good procedural material for eyes, I’ve been following an excellent tutorial at http://blenderartists.org/forum/showthread.php?t=85722
With an eye made in this method, you end up with a flat iris, and a clear bubble of a lens bumping out from the eyeball, just like real.
What I’m wanting to do is animate an eyelid which can open and close around the lens bump. My eyelids are simply half spheres. Normally Eyelids don’t need to be hollowed out because the “gap” is taken by the eyeball… but in this case the eyelid can be seen penetrating the lens right down to the flat iris.
The method I initially tried to fix this with was to add a boolean modifier taking the difference of the eyeball shape from the eyelid (the eyelid is just a half sphere). This worked but it added a terribly long render time.
So, as shown here, I decided to make an invisible boolean shape, just for the lens part. Being smaller that subtracting the whole eyeball, it’s a little faster in render time, but not much.
I’m thinking booleans are too much of a killer to animation time to be practical. Are there other methods animators would use which I should consider?