I've done field rendering work in the past for NTSC TV output, but not with 
Povray.

Everyone thinks NSTC TV has 30 full frames per second, but it actually has 
60 half frames per second containing odd and even lines that are 
interlaced.  So YES, you will need to render twice as many frames, but they 
will be half frames, NO they are not combined into a single frame 
afterwards, they are output INTERLACED, first the odd frame, then the even 
one, and so on at 60 (half)FPS.  And get this: each interlaced half frame 
is actually different in time than the previous interlaced half frame.  
NTSC TV actually records movement at 60 (half)FPS, most people do not know 
that.

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