Import 3D objects from Illustrator?
The 3D extrusion offered in Illustrator is a 2D rendition of 3 dimensions. It won't have any 3D properties in AE.
As you say, AE only works with 2D objects in 3D space. The third party plugin Zaxwerks 3D Invigorator allows true 3D modelling within AE, with the Pro version supporting import of 3D models.
<http://www.zaxwerks.com>
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