SharkD nous apporta ses lumieres en ce 2007/06/16 14:06:
> I may combine that with another trick I came up with:
> 
> #declare Count = 0;
> #declare Increment = 0.01;
> #declare Exhaust_Plume = union
> {
>  #while (Count < 1)
>   cone
>   {
>    <0,Count * -100,0,>, 6 + Count * 26, <0,(Count + Increment) * -100,0,>, 6
> + (Count + Increment) * 26
>    open
>    material
>    {
>     texture
>     {
>      pigment {color rgbt 1}
>     }
>     interior
>     {
>      ior (1.01 - Count * 0.01)
>     }
>    }
>   }
>   #declare Count = Count + Increment;
>  #end
> }
> 
> object
> {
>  Exhaust_Plume
> }
> 
> 
Remember that hot air have an ior that is inferior than that of the ambient air. 
Ambient air have an ior of 1 (strictly, it's the ior of vacuum, air is about 
1.001 to 1.003 depending on persure ant temperature).
So your hot air should have an ior LESS than 1 by a very small margin:
  0.98< HotAirIOR < 1.0

-- 
Alain
-------------------------------------------------
To define recursion, we must first define recursion.

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