You could have downloaded Unity for Autodesk Revit 2.0.0.0 from our software library for free. Unity for Autodesk Revit is categorized as Photo & Graphics Tools. The following versions: 2.0 and 1.0 were the most frequently downloaded ones by the program users. This free tool was originally developed by AMC Bridge.
From the developer:
Unity for Autodesk Revit is an add-in to connect Autodesk Revit and Unity gaming development platform. The add-in supports export of 3D model geometry from Revit to Unity allowing users to have first person 3D shooter game like experience while using Revit created model as the 3D environment.
You may want to check out more software, such as Autodesk Revit Architecture 2011, eTransmit for Autodesk Revit or Autodesk Revit MEP 2012, which might be similar to Unity for Autodesk Revit.
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