I'm not sure about FLASH but in a true 3d gaming engine the camera (view) can be set to orthogonal or perspective.
Orthogonal will make a 3d room look 2D
Perspective will give you that trapezoid 3d look
Then the FOV (field of view) will alter the effect of the that trapezoid look.
Hope that helps.
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In FP10 any plane rotated will give you a semi 3d perspective(depth) which is good enough for planes but for "3d" objects such as a desk you would need to control multiple primitives(i.e. cubes) and although you could get a reasonable 3d effect you want it will be no where near as "clean" as using a 3d engine.
Away3D have a 'lite" subset of their 3d engine which also is FP10 compatible so it would be worth a look, fp10 is create for basic depth manipulation but not for 3d worlds.
Thanks, that (FP10 limitations) is what I have been discovering so your confirmation is greatly appreciated (I'm pretty noob).
Fwiw I've played around with AlternativaPlatform.com as it seemed the best documented for learning resources.