I think I get you.
Except for the fact that, what I'm thinking about is, since there is no csg 
taking place and all the objects are set to hollow (meaning the sphere 
hollowness should be unchanged regardless) why then isn't it still just a 
totally invisible object? It ought to be as a container object should be for 
media and not ever become visible when an external object encounters it.
I remind you of the fact that *all* objects are set to hollow and inversing 
any would still make for all hollow (or is this the thing, hollow turns 
off???). Reason of course being that the outside of any is already hollow 
anyway, and setting them to hollow is like making the entire scene hollow.
Right? or am I still not convincing anyone?

Message <36660FC3.9D17DED0@Kopp.com>, Nathan Kopp  typed...
>
>> // refraction seems to jump into an external object
>> // which itself does not have an ior
>> // 98.91, bob hughes
>> 
>> // when 1 (inverse used) refraction jumps into sphere, 2 does not
>
>Actually, this is technically not true.  The sphere DOES have an IOR... it is
>1.0 by default.  Because this is the same as the air (empty space), when
>you don't use inverse, you don't see any effect.  However, when you do
>use the inverse, as Ken mentioned, the camera is inside the water plane, so
>there is a change in IOR values when the light beam passes from the water
>(ior 1.23) into the sphere (ior 1.0).  Therefore, POV calculates the
>refraction angle properly.
>
>-Nathan

-- 
 omniVERSE: beyond the universe
  http://members.aol.com/inversez/POVring.html
=Bob

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