"Peter Popov" <pet### [at] usanet> wrote in message
news:n5HQOC6KhugVTNYVWcRouktn4iBJ@4ax.com...
| 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.

A possibility might be to use a 'texture_map' in POV-Ray 3.0*, but not in 3.1
(using the #version directive doesn't work).
Before refraction was moved into the 'interior' statement it was possible to use
ior in finishes and thus also in texture maps to 'average' or otherwise pattern
the refractions together.  This would make for a variable refraction.

Bob

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