To ensure your models are aligned I highly suggest seeing the BYU tutorial. http://cmfac.groups.et.byu.net/miller/cm411/help/navisworks/Navis11.php Granted, I am biased as I wrote the tutorial when I was still going to school there, but it still holds true. If you have additional questions feel free to contact me. michaelnsmith86@gmail.com In general, the best way is to ensure your origins truely are in the same location. Revit origins are actually arbitrary where they are formed initially. If you are using a normal CAD system, ensure your ucs is set to the Revit origin.
please check out some of the tutorials that I compiled.
Quick start tutorial on Navisworks http://bit.ly/wjv8ZQ
Clash Detective http://bit.ly/wsXkHG
Navisworks Tutorials - 4D Timeliner http://bit.ly/GGvhhM
cheers,
Jerome
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