"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
  }
}

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