You would have to add 3D models to your footprints in your library. Otherwise your 3D export will be the unassembled PCB only. Most models are available on 3DContentCentral.com.
No or Yes, you can only place 3D bodies for components in PCB and get 3D view of your design. I think by placing components are your will. yes you can somehow modelize in 3D. Just an opinion.
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