> Okay, like this the refraction is always well defined. But it is rather
> unlogical to refract from 1.2 -> 1.0 even though though the ray has never
> been in space with ior 1.2.

But can you tell me conclusively what the interior ior of the intersection
object is, 1.0 or 1.2?  Sort of schrodinger's fridge*.

>
> Of course, a feature not a bug ;). What has the effort of moving ior from
> finish to interior been worth if it is still possible that a ray enters at
> one ior and leaves at another? IMO at least a warning should be issued.
>
I don't know why it was moved other than in reality it is a property of the
interior rather than the surface regardless of how POV treats (calculates)
it.
yes, perhaps it would be helpful for debugging puprose to have POV warn you
when an object has more than one ior applied.

-tgq

*http://angryflower.com/schrod.gif

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