First, Revit is not an AutoCAD based product as the previous answer suggested. It is owned by Autodesk which makes AutoCAD, but it's in no way based on AutoCAD, infact it was designed as an alternative program to AutoCAD or AutoCAD Architecture to design buildings.
Revit can both do building designs and decent rendering output. It can't do photo-realistic design work, but more than good enough renderings to get your design intent across.
That being said... to use Revit correctly you really need to understand how a building goes together. Have you thought about the free download, SketchUp? It can do some interesting things and many architects use it to define the initial design of their structures before moving into construction documentation. Content provided by Yahoo Answers.
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