Topic: Model appearing as 2D lines in Navisworks

[Hangman]

Morn'n ever-body,
I am in need of some assistance please.

I don't have Navisworks so I can't duplicate this problem I am having, but my model - according to the architect - is showing up as 2D lines when it is brought into Navisworks.
We had a clash detection meeting the other day and everybody's model looked like it should, except mine.  The items I modeled myself appeared as they should, but the default piping was 2D linework and didn't reflect the 12" diameter pipe I was using.

I don't know why, can someone shed some light on this for me?
Is there something I need to adjust or set in my model to make it appear properly?  Let me ask this; When I create a plan of a mechanical room, when the model is viewed in Coarse or Medium, I see 2D lines, when viewed in Fine, I see the true aspect of a pipe.  Could this have anything to do with bringing a model into Navisworks?  Could the BIM guy at the architects office be bringing the model in incorrectly or in a Coarse or Medium mode?  I wouldn't think so as all the other disciplines models appeared to be just fine, but I don't know.
Could Materials have something to do with this?  I have left the materials as default as I haven't had a need to make it look pretty.  Perhaps I am misunderstanding the need of materials.

I am grasping at straws here as I have read through my books and have searched through the Revit settings for something, anything that would help with this, but I can't find a thing or a reason for my model to not show up correctly in Navisworks.

ANY thoughts, ANY idea's, any random ramblings will be accepted here.  Like I said, I'm grasping at straws.

Thank you so very much.

[RobDraw]

I don't know how Navisworks does it but I'm pretty sure it has to do with the view settings as you've stated. Those single lines pipes are actually 3D linework, they have elevation and thickness. I would turn it around to them stating that the piping is indeed modeled and the view setting needs to be set to fine for it to be viewable as 2 line pipes.

[M@yhem]

I don't know how Navisworks does it but I'm pretty sure it has to do with the view settings as you've stated. Those single lines pipes are actually 3D linework, they have elevation and thickness. I would turn it around to them stating that the piping is indeed modeled and the view setting needs to be set to fine for it to be viewable as 2 line pipes.

I've got to agree (don't have NW to confirm) because piping won't show up as 3D pipes until the detail level is set to FINE.  Have them set the level to fine and try it again.