Rune wrote:

> Ooh, that looks nice! 

Hey, thanks!

> Even knowing the technique, I can't quite figure out 
> how the image must look before the contrast enhancement.

It's a reflective eye which has an outside surface with an ior of 1.33.
A simple gradient z for the sclera, radial for the iris.

> The technique is demonstrated in the POV-Ray demo files 
> \scenes\textures\pigments\transmitfx.pov and scenes\advanced\bwstripe.pov

Hmm, what do you know. I'll have to look at it.

> Unfortunately, since POV-Ray 3.6, when using really high contrast, the 
> effects looks aliased even if antialias is used. This is because of the 
> controversial decision to make POV-Ray do clipping *after* antialiasing 
> rather than before. In POV-Ray 3.5 it looked perfect. However, you can 
> always render at a higher resolution and scale down.
> 
> Rune

Gah, I don't know why it was changed!

Speaking of odd aa behavior, I don't even use +am1 anymore because of 
the strange artifacts. Is that also due to post-clipping of averaged 
samples? It's unfortunate, since method 2 is faster.... at least I think 
it is.

~Sam

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