Tim Nikias v2.0 nous apporta ses lumieres ainsi en ce 2004/05/06 18:25... :

>And, if I'm not mistaken, dispersion should be >1 to produce any kind of
>rainbow-effect, try using 1.01 or such.
>
>Regards,
>Tim
>
>  
>
The sphere have distersion=1 and the cylinder have dispersion=1.1. 
"Natural" value goes from >1 to 1.1, but you can use about any value 
!=1, even negative if you want.
Try using  "dispersion_samples" with a value greater than the default of 7
||
Alain

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