I don't think we'll have 3D AI art anytime soon. Most if not all AI for 2D works on a pixel basis. 3D is more like SVG, except there is a whole third dimension to contend with. There are AIs that manage to produce SVGs, but I have yet to see a clean one where the objects are actually properly grouped and not just a bunch of random shapes thrown together to do a vector approximation of pixels.

If anyone finds an AI that can do reasonable SVGs, please do let me know.