Quote:
Originally Posted by khalleron
Except that 3D computer animation (Toy Story) can easily be converted to quite admirable 3D. It's live action (Clash of the Titans) and cel animation (Beauty and the Beast) that does not convert well.
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It's because all the models are already 3D information in the computer. They basically just need to render the same scenes again from a secondary viewpoint and merge with the already shot scenes.
No such luck with 2D movies, which are not 3D models, just 2D photos... the conversion then proceeds basically by dividing a scene into foreground and background and just slightly shifting such layers away from each other for each camera angle. It's quite like taking a photograph, cutting away foreground and midground and sticking them stacked higher relative to each other to the background with nails. There's no extra 3D information in there: if a scene happens to show a cube whose left side is never shown in the original recording, you'll never see it in fake 3D anyway...