TinCanMan wrote:

>> 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?  
> 

No, IMO it is not defined (and cannot be defined in a logical and 
consistent way). That is why I think there is something to be changed with 
POV-Ray, e.g. issue a warning.

-- 
http://objects.povworld.org - the POV-Ray Objects Collection

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