Is there a way to extrude a 2D object? Or apply an image as a
projection texture map through the depth of a cube?
For example, say I want to take a 2D image of a picture frame and
give it depth.
I could build such a simple object with cubes and textures, but as
the object got more complex... well, you can only imagine. From an
earlier discussion I'd expect that lots of cubes would be unpleasant.
There's no means to create arbitrary 3D objects in Quartz Composer.
If this is something you want, please file a feature request at
bugreport.apple.com.
On a more general note, let me mention to the list that the period
immediately after a major shipment (like, say, Tiger ;-), is the best
possible time to submit feature requests.