Kenneth <kdw### [at] gmailcom> wrote:
> #declare C=1;
> #while(C<=40)
> sphere{0,1
>  scale .1 + .20*C
>  pigment{rgbt <.1,1,.1,.99>}
>  }
> #declare C=C+1;
> #end
> #else
> #end

POV-Ray 3.7 does not increase the recursion count when the object has
an ior of 1 (ie. the direction of the ray doesn't change.)

If you give those spheres an ior different from 1, you should get the
behavior you expect.

-- 
                                                          - Warp

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