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Hi,
I've never been using Revit yet, but I'm kind of Blender guy. I have found that Revit can export to ifc file format (Industrial Foundation Class), there is ifc plugin for Blender http://www.blender3darchitect.com/2011/06/import-ifc-files-to-blender-with-ifcopenshell/ and you can download it from graphicall.org This solution should work. By the way, you can work with blender and v-ray, to gest hi-end renderers - vray.cgdo.ru
Regards
Martin