Wasn't it Orchid XP v2 who wrote:
>I tried to do this:
>
>pigment {function {f_bozo(x, y + frame_number, z)}}
>
>...and got an error message. Seems POV-Ray doesn't think "frame_number" 
>is a valid token. (Was expecting ",".)
>
>Anybody wanna take a guess why this is happening? I just want the 
>function to change slightly each frame...

This works:

#declare F = frame_number;
...
pigment {function {f_bozo(x, y + F, z)}}

-- 
Mike Williams
Gentleman of Leisure

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