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On Sat, 2010-04-10 at 22:59 +0100, Rhia Knowles wrote: > I did some research on this after watching Avatar 3D at Vue Exeter, it > seems the lenses in the cinema 3d goggles are 'Circularily polarised'. > Basically this means if you take 2 pairs and put the right lens over > the left one of the second pair at 90 degrees it should be blocking > all light, or letting it all through, if you managed 270 degrees. > > Because of the polarisation this is how the glasses are able to act as > shutters,stuff for the right eye is off 90 degrees to the left one. > > They also need a silver layer on the back of the movie screen, as a > normal screen alters the polarisation slightly. > > More info here http://wapedia.mobi/en/Polarized_glasses Having seen both movies and having no idea if the 3D technology is different for each I have to say the Alice looked a lot darker than avatar. The specs came out of the same bin in Taunton Odeon and looked the same to me. Visuals were FAB Scott, shame about Dances With Smurfs and Alice re-written as Lord of The Wrings (find the mcmuffin and free the world!). Simon -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/linux_adm/list-faq.html