Chris B wrote:
> "Varala" <var### [at] gmailcom> wrote in message 
> news:web.4865f7c585dff5ef25acb1ab0@news.povray.org...
>> Dear Sir/Madam
>>
>> This is R.Varalakshmi and i am doing my year 3 Electrical Engineering at 
>> the
>> National University of Singapore. I am currently working on a research 
>> project
>> under my professor on negative refractive index materials. I have a 
>> certain
>> doubt and don't know anybody else to approach for the same, when by chance 
>> i
>> saw your thread on the net with regard to POV. Sorry for the random 
>> mailing but
>> your help could mean a lot to me.
>>
>> Could you please tell me if there is a way to create pictures using POV 
>> Ray
>> tracing for light with a negative refractive index. And though it is still 
>> not
>> existent in the real world, my job is to produce the effects which can be 
>> seen
>> by the negative refractive index materials in pictures. I want to know 
>> whether
>> this is possible using POV Raytrcaing and if yes please tell me on how to
>> implement the idea.
>>
>> I would be very grateful for any sort of help or advice from you at the
>> earliest.
>>
>> Thanks and Regards
>> R.Varalakshmi
>>
> 
> The IOR setting in POV-Ray does accept negative values. I couldn't tell you 
> whether it is theoretically optically correct, but it does render something 
> different from the equivalent positive value.
> 
> The following complete POV-Ray scene file renders a transparent sphere and 
> box on a checkered plane. The IOR is controlled by the clock so that it 
> passes from 2 to -2 when rendered with animation command-line options such 
> as +kfi0 +kff21 (or ini file settings of: Initial_Frame=0 Final_Frame=21).
> 
> Regards,
> Chris B.
> 
> // Animation options: +kfi0 +kff21
> camera {location <0,3,-5> look_at <-1,1,0>}
> light_source {   <100,100 ,-100>, rgb 1}
> 
> sphere {<0,0,0>,2
>   pigment {rgbt 1}
>   interior {ior 2-4*clock}
>   // or, if you don't want to animate, use:
>   // interior {ior -1.1}
> }
> 
> box {<-4,0,0>,<-2,2,2>
>   pigment {rgbt 1}
>   interior {ior 2-4*clock}
> }
> 
> // A Checkered Plane
> plane {y,-3 pigment {checker}}
> 
> // A Sky
> sky_sphere {
>   pigment {
>     gradient y
>     color_map {
>       [ 0.5  color <0.7,0.7,1> ]
>       [ 1.0  color <0.2,0.2,1> ]
>     }
>     scale 0.2
>     translate -1
>   }
> }
> 
> 
> 
> 
May I point you to a paper published by Dolling, Wegener, Linden and
Hormann on 6 March 2006.
http://www.opticsexpress.org/abstract.cfm?id=88325&CFID=29931998&CFTOKEN=78387185
I believe this may help answer your question

John

-- 
I will be brief but not nearly so brief as Salvador Dali, who gave the
world's shortest speech. He said, "I will be so brief I am already
finished," then he sat down.

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