Every once in a while some small setting thing will pop up -- either I'll get confused about which floor I'm on, I'll be looking at an older version of the composite model and forget.

...when that happens I give my ticker a little impromptu stress test.

One such occurrence happened recently kudos to Navisworks handling of the NWCs created from Revit via the API module (I call it NWC OUT, since thats what it was called in ACAD back in the day).

 Anyhow the problem is specifically related to a new feature in 2010: The ability to use (and in my case abuse) shared coordinates.

The problem goes something like so:

 As you can see, the green export, prepared via a lengthy (like, 24 hours of processing on a 3.0 GHz box w/ 8GB of RAM) Revit to DWG ripping process.  The solid is the fast NWC out from Revit (Tools --> External Tools) option.

As you can see, both files, appended with no additional steps for some reason are off in both the X & Y direction.  Since my trade contractors were well on their way modeling for the purpose of MEP coordination (and doing epic battles with the laws of physics), I felt my stomach drop to somewhere around my shoes.

I quickly discovered that I couldn't move the revit-created NWC file (the solid one).  It was locked and simply wouldn't move

After looking through the various options, I discovered the fix: switch the NWC export tool from it's default setting of using shared coordinates to using project internal...  Apparently the navisworks team assumed that most Revit teams don't bother to make sure they all start of the same base model in the same location.  I guess my motley band of characters is an exception to that rule.

 An important note: if you're using shared coordinates, your NWC will be locked -- you can't bump it around at all... a huge pain.  And if a designer has true north set different from project north, well that'll be a headache too.  Not fun.

So, to fix that setting, follow along:

 1) Open your project in revit.  Click Tools --> external options --> Navisworks 2010

2)click on this box:

 3) ...and change it to project internal.

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Comments (1)

• |2009-11-09 13:40:21 Chase
  Good info Man! Can't wait to be a master like you!
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