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The Card is one of the workhorses of Nuke's 3D system and is the main means by which 2.5D compositing is done. It is one of the pre-made 3D geometries that you can place inside of a 3D Nuke scene and in the 3D environment it presents as a simple 2D plane floating in space.

Tip: the card can be distorted via the settings in its 'Deform' tab. Pull the 'type' parameter in the pull-down menu to 'bilinear' and start moving the points on the card around. This last time I used this was when I placed some smoke on a card and needed to wrap it round a burning building.