Conversion from U3D to Revit is not supported yet :(

U3D

Universal 3D (U3D) is a compressed file format standard for 3D computer graphics data.

The format was defined by a special consortium called 3D Industry Forum that brought together a diverse group of companies and organizations, including Intel, Boeing, HP, Adobe Systems, Bentley Systems, Right Hemisphere and others whose main focus had been the promotional development of 3D graphics for use in various industries, specifically at this time manufacturing as well as construction and industrial plant design. The format was later standardized by Ecma International in August 2005 as ECMA-363.

The goal is a universal standard for three-dimensional data of all kinds, to facilitate data exchange. The consortium promoted also the development of an open source library for facilitating the adoption of the format.

Revit

A .rvt file a three-dimensional model created by Autodesk’s Revit. Revit is a building information modeling (BIM) program that is used to create 3D building designs for floor plans, elevations and sections. It offers complete project lifecyle from conceptual design till fabrication and construction.