topic Re: Polyline in linked dwg file into Revit in Revit Structure Forum

Polyline in linked dwg file into Revit

Anonymous — Thu, 18 Feb 2016 13:57:24 GMT

Hello everyone

I have a short questions that I´ll hope someone out there can answer.

I have a dwg file with a polyline, The polyline is drawned with the start segment width set to 0, and the end segment width set to 500.

When I link this dwg file into Revit the polyline is just a straight line where the end and start segment seems to have the same width.

So I´m wondering why it behaves like that and if theres a solution for this?

See the attached file.

Appreciate all the help

//David

Re: Polyline in linked dwg file into Revit

sureshchotrani — Mon, 22 Feb 2016 11:10:29 GMT

I tried the same, Revit doesn't reads polyline width.

Kindly know the purpose of this, why are you looking to import polyline with width in Revit?

Re: Polyline in linked dwg file into Revit

ennujozlagam — Tue, 23 Feb 2016 02:33:18 GMT

hi, i had tried this also and Revit doesn't read. Try to use QLEADER instead of using polyline with start segment. QLEADER managed to read in Revit. hope it helps. thanks

Re: Polyline in linked dwg file into Revit

alan.quinn — Fri, 26 Feb 2016 15:27:53 GMT

I understand your imported Polylines are not appearing in Revit as expected. This is a known issue that the development team is aware of. A common work-a-round is to use a Filled Region, Detail or Model Lines (depending on needs) in Revit. The development team is looking into ways of addressing this but no indication was given on when the code changes will be made or released. I wish I could offer more but at the moment I'm not sure I can. Please let me know if you have any follow up questions or comments.

As always thanks for posting.

Re: Polyline in linked dwg file into Revit

RDAOU — Tue, 15 Apr 2025 09:16:33 GMT

Behavior:

Polylines are a very old issue with Revit since it was developed...for some reason Revit seems unable to translate the width/type of polylines (in general) on its own. So how if its 1 line with several segments on 1 linetype and various width for each segment maybe because Revit reads lines, layers and coordinates differently than CAD.

Thinking out loud; from that attached photo it appears that you used a lightweight polyline. As such the vertices don't have a Z value where Z is an essential input in Revit. And LW Plines appear to be one of the few if not the only which has no Z Value (not even 0) And this doesn't exist in Revit... ie: missing input => wrong behavior...Nonetheless, this is my personal assumption and best if Autodesk Development would confirm

Suggestion:

One known workaround for polylines with uniform width (example: room boundaries; filled regions...): You can inn AutoCAD place the Polylines of similar width/Linetypes on their own AutoCAD Layer and then under "Object Styles >> Imported Objects" tab assign a specific thickness and line pattern to that specific Layer. Then Revit should be easily able to translate it.

For Polylines with variable width verticies: (I haven't done this personally but I've seen it on several Revit Blogs) one can resort to scripting a code (.NET) to translate the properties of each segment/vertex in the PLine so Revit can then read it...I think it has to be done pre- Revit API...You may want to check in the AutoCAD forums. I know there are for sure coding methods which can introduce functions like Vertices to Points something like Read Geometry in Python to extract/read/translate the info of X,Y geometries (such as LW_PLines) into an X Y Z for each vertex in the geometry readable by other softwares.