Peter Popov wrote in message ...
>On Thu, 16 Mar 2000 13:58:57 +0800, Pabs <pab### [at] hotmailcom> wrote:
>>How would it be possible to create a mirage in any current or old
>>version of POV-Ray (I imagine that the interior of an object could
>>modify the direction a ray is traced backwards ??)
>
>Refraction is surely one way to do it. Keep in mind that most if not
>all types of mirages are caused by the variable ior of hot vs. cold
>air, and in POV there's no variable ior

You can fake a continuously variable IOR by stacking a number of very thin
boxes with the desired IORs.  This will approximate a variable IOR, but will
take an extremely long time to render.

Mark

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