I'd say use +KFI1 +KFF4 in the commandline
and add these lines:

#if (frame_number=1)
 #declare UseConserve = true;
 #declare UseFresnel = true;
#end
#if (frame_number=2)
 #declare UseConserve = true;
 #declare UseFresnel = false;
#end
#if (frame_number=3)
 #declare UseConserve = false;
 #declare UseFresnel = true;
#end
#if (frame_number=4)
 #declare UseConserve = false;
 #declare UseFresnel = false;
#end

Attached the source for easy handling.
--
Tim Nikias v2.0
Homepage: http://www.digitaltwilight.de/no_lights
Email: Tim### [at] gmxde

> See thread in povray.general with same subject.
>
>
>

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