I read this a little while ago, on rendering for TV output. The resolution for PAL is 768×576 pixels, NTSC is 768×480, D1 is 720×576 and the pixel aspect ratio is ‘(the vertical resolution ÷ the horizontal resolution) × 4/3’. Here are some websites I came across, back in November 2000 on XML co-inventor Tim Bray and his views on 3D rendering. ::: http://news.cnet.com/news/0-1005-200-3670541.html