I'm not entirely familiar with Impression 3, but sometimes when exporting/importing between programs, the units can become an issue. Since Revit is set to "feet" as the default unit, you may want to look at setting up your Impression 3 file to "feet" (if possible) before you try and import your Revit file. If that doesn't work, I'm out of ideas.
Good luck.
Edited by: Discussion_Admin on Feb 28, 2010 8:14 PM
Edited by: rosskirby on Feb 28, 2010 7:24 PM
Ross Kirby
Principal
Dynamik Design
www.dynamikdesign.com