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Tricks
Cards can exactly represent only perfectly flat surfaces, since they are themselves flat. It is relatively common to use flat cards in 3-D compositing setups because the amount of perspective shift that should occur, if the item on the card was more accurately modeled, is not discernable. You can extract and build up composites with multiple levels of cards with extracted textures, if you build appropriate alpha channels for them.
If the camera moves a lot, a single card can start to present an inaccurate view, one that shows its essential flatness. You can create multiple cards, oriented differently
to match different parts of the shot, compute the texture based on the correspondingly limited portion of the shot, and fade them in and out over the duration of the shot (in your composition or 3-D animation app).
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