topic Re: Revit Export to AutoCAD in Revit MEP Forum

Revit Export to AutoCAD

r.francisque — Wed, 26 Dec 2018 16:48:53 GMT

I'm having an issue when I export my 3d Revit model to AutoCAD to post in Naviswork for coordination. My conduits are 5 inches higher then I have in my Revit Model. For example if I have a conduit at the height of 9'-0" in my Revit model when i go into the naviswork model my conduits would be at 9'-5"

Re: Revit Export to AutoCAD

s.borello — Wed, 26 Dec 2018 18:39:58 GMT

Only your conduits are off or the entire model? Are you able to post any files for us to take a look?

Re: Revit Export to AutoCAD

r.francisque — Wed, 26 Dec 2018 18:45:02 GMT

Anything i post is higher by 5 inches in the naviswork model when I'

Re: Revit Export to AutoCAD

SteveKStafford — Wed, 26 Dec 2018 20:41:46 GMT

There is no need to export to AutoCAD first, just export to Navisworks format (NWC) directly from Revit. You might need to install the Export addin depending on the version of Revit you're using.

Have you used/configured Shared Coordinates? Are you exporting using that or Project Coordinates? Are your levels set properly? In other words if Level 1 is at 5" then your pipe is 9'-0" above Level 1 but actually at 9'-5" relative to zero.

Re: Revit Export to AutoCAD

r.francisque — Wed, 26 Dec 2018 20:49:17 GMT

I have to export to AutoCAD because the project manger ask that all trades post their models in DWG files.

I'm using revit 2018 i'm not sure if it has the export addin your referring too.

i'm using Project Coordinates

Re: Revit Export to AutoCAD

SteveKStafford — Wed, 26 Dec 2018 20:55:08 GMT

Okay, I suppose they have their own reasons (probably layer based search sets) but translation from one format to be read into another where native formats are available isn't optimal.

What do you find when you examine the DWG file yourself? Is everything offset by this 5"? If you're responding to their criticism of your file it is possible they are altering it in Navisworks incorrectly. For example, there could a Z axis transform that moves your model or the other models they are using could be wrong instead.

Re: Revit Export to AutoCAD

r.francisque — Wed, 26 Dec 2018 21:20:01 GMT

when i examine the dwg file it says the correct height that i had in the revit model

Re: Revit Export to AutoCAD

SteveKStafford — Wed, 26 Dec 2018 21:22:35 GMT

Do you have Navisworks too? Try appending your DWG file and see what you get.

I suspect your file is getting transformed incorrectly when it is appended to their model. That could be a units issue or the user may have used Units and Transform and shifted your model "up".

Re: Revit Export to AutoCAD

r.francisque — Wed, 26 Dec 2018 21:27:18 GMT

i do have naviswork and i did append my dwg and when i did that my drawings came in still 5" above what i had in the revit model

Re: Revit Export to AutoCAD

SteveKStafford — Wed, 26 Dec 2018 21:35:13 GMT

Have you examined the Options associated with Importing DWG, (under File Readers). After appending the file, select it and right-click on it in the Selection window and choose Units and Transform and see what the values are there.