wolfman wrote:
> Sorry,
> 
> I found this in the beginner's newsgroup (hadn't looked there before):

Come on - if you have read Mike's reply you probably have read mine as 
well so i don't need to repeat it...

Note that according to the most common definitions of the index of 
refraction a negative one is not possible (this has nothing to do with 
physics but mere mathematics).  So if you want to know if POV-Ray 
correctly handles what you call negative ior you first have to decide 
what a negative ior actually is.

And just for the record: for refraction (which is not the only place 
where ior is used) POV-Ray uses Heckbert's method, see 'Derivation of 
Refraction Formulas' on:

http://www.cs.cmu.edu/~ph/


Christoph

-- 
POV-Ray tutorials, include files, Landscape of the week:
http://www.tu-bs.de/~y0013390/ (Last updated 24 Jul. 2005)
MegaPOV with mechanics simulation: http://megapov.inetart.net/

Post a reply to this message