It certainly is possible. But it doesn't come just at the click of a button.
If you know what you are doing, you can get way beyond the graphics of BIMx. If, on the other side, you are pressed in time and simply need to click/bang have a nice real-time model, BIMx delivers nicely (if you do the Radiosity pre-calculation, that is).
Unity is like an open-ended custom 3D environment, where you can do anything. But it takes a good mastery of the tools.
FWIW, I did write a book on it:
Unity for Architectural Visualization
and a video course:
Building an Architectural Walkthrough using Unity
Both slightly outdated since Unity 5 was released, but it gives you the basics of getting models into Unity and do some basic interactive programming.
I'm planning to update my learning material to cover the new Unity 5 Realtime GI and Shaders, but it'll take time.
--- stefan boeykens --- bim-expert-architect-engineer-musician ---
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