Here is the head of Backlights README.TXT ....


>       BACKLIGHT Relativistic Raytracer v2.9
>         COPYRIGHT (C) ANTONY SEARLE 1997-1999
>         www.anu.edu.au/Physics/Searle
>               <Win32 Release 1>
> 
> [ This documentation is not complete. Due to the currently
>   small user base, interaction with the author is encouraged,
>   so that a FAQ can be written, and relevant problems ironed
>   out. Please send your questions using the e-mail address on 
>   the BACKLIGHT website (see above)     ]
> 
> - INTRODUCTION ------------------------------------------------
> 
> Thank you for downloading the BACKLIGHT Relativistic Raytracer.
> This program will allow you to produce relativistically correct
> images, demonstrating the effects of special relativity, using
> a photorealistic raytracing algorithm.
> 



Steven Waddell wrote:
> 
> Does anyone know of a a version of POVRAY that takes account of the effects
> of general relativity?
> 
> Also suggestions of any other relativistic raytracers would be appreciated

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