goBIM which was released for the iphone, yes you read that right is running on the ipad. It is a BIM viewer that has an exporter APWe that will let you translate Revit and Rhino models into its own format. Why's it's own format
By signing up for the service and downloading their app, you can transform your iPad into a media viewer with content from all over the web. With access to over 1000 content channels, you can create a custom presentation of media
ipad viewer iPAD : BIM : Game Changer  BIM, the Built Environment and Stuff

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