In article <3bcec559@news.povray.org>, "Thorsten Froehlich"
<tho### [at] trfde> wrote:

>If you render only 25/30 frames (for PAL/NTSC video
>output) you will not see a difference because the video program will simply
>use the same image and do the necessary conversion to an interlaced format
>automatically.  It is different if you want to output with a framerate that
>does _match_ the interlaced frame rate of your video system.  So if you
>output with 50/60 frames/second you do want to use this option as is allows
>you to reduce render time because POV-Ray will only need to render half as
>many lines.
>Note: The above is only true if you do a full resolution PAL/NTSC output.
>Meaning 768*576 for PAL and 640*480 for NTSC with 50/60 frames per second
>with field rendering.  If you use half of resolution, i.e. 384*288 or
>320*240 you gain nothing with field rendering - only using 25/30 full frames
>per second makes sense for this resolution or any other resolution below the
>native resolution of PAL/NTSC.

Thanks Thorsten!
This is valuable information indeed. Is it wrong to ask if this could be
included in the documentation?

-- 
Tom Stone
Domarebacken 42, 14557 Norsborg, Sweden
Phone: Int+46 8 5318 4318, Tel: 08-5318 4318
http://home5.swipnet.se/~w-52256/index.htm

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