# Get CAD Overlapped Polycurves **URL:** \ **Category:** Revit\ **Tags:** revit, python, dynamo\ **Created:** [November 8, 2023, 7:37am UTC](https://forum.dynamobim.com/t/get-cad-overlapped-polycurves/95304 "2023-11-08T07:37:07Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![vishalghuge2500](https://avatars.discourse-cdn.com/v4/letter/v/7ea924/32.png) [@vishalghuge2500](https://forum.dynamobim.com/u/vishalghuge2500)\ **Post date:** [November 8, 2023, 7:37am UTC](https://forum.dynamobim.com/t/get-cad-overlapped-polycurves/95304/1 "2023-11-08T07:37:07Z")
hello all, I’m trying to get both the rectangles separately (polycurves) from the cad file. all objects are in one layer. [overlaped lines.dwg](https://forum.dynamobim.com/uploads/short-url/rkRQtAdclqnefP5lilv3xcrXnB3.dwg) (67.5 KB) ![Screenshot 2023-11-08 131354](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/8/c/8cef0696282509c88e9e7cc12385e871f7cb9e07.png) ![image](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/8/f/8f7c49e5d91dd0b471456913cfe524a9b85e6005.png) ---
**Author:** ![Andrej](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/andrej/32/172909_2.png) [@Andrej](https://forum.dynamobim.com/u/Andrej)\ **Post date:** [November 8, 2023, 8:58am UTC](https://forum.dynamobim.com/t/get-cad-overlapped-polycurves/95304/2 "2023-11-08T08:58:31Z")
try to group curves first. Use Group Curves node and see if it helps… ---
**Author:** ![vishalghuge2500](https://avatars.discourse-cdn.com/v4/letter/v/7ea924/32.png) [@vishalghuge2500](https://forum.dynamobim.com/u/vishalghuge2500)\ **Post date:** [November 8, 2023, 9:29am UTC](https://forum.dynamobim.com/t/get-cad-overlapped-polycurves/95304/3 "2023-11-08T09:29:39Z")
null ![image](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/0/f/0fde4a2c0d0fec784a02560db28d9478e808aae7.png) ---
**Author:** ![Andrej](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/andrej/32/172909_2.png) [@Andrej](https://forum.dynamobim.com/u/Andrej)\ **Post date:** [November 8, 2023, 10:45am UTC](https://forum.dynamobim.com/t/get-cad-overlapped-polycurves/95304/4 "2023-11-08T10:45:39Z")
Connect \_groupedCurves with the node PolyCurve.ByCurves, and see if that helps. EDIT: use level @1 in Group Curves node ---
**Author:** ![sovitek](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/sovitek/32/116237_2.png) [@sovitek](https://forum.dynamobim.com/u/sovitek)\ **Post date:** [November 8, 2023, 10:55am UTC](https://forum.dynamobim.com/t/get-cad-overlapped-polycurves/95304/5 "2023-11-08T10:55:11Z")
Hi keep in mind group curves expect a flatten list… ![Skærmbillede 2023-11-08 115414](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/f/d/fdf33a06a8431cfea17b0711bbea19373a2f6945.png) or try set level to L2 in group curves ![Skærmbillede 2023-11-08 115414](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/7/3/732c8500574252a2c742745f7fb3b51c09ca1e23.png) ---
**Author:** ![vishalghuge2500](https://avatars.discourse-cdn.com/v4/letter/v/7ea924/32.png) [@vishalghuge2500](https://forum.dynamobim.com/u/vishalghuge2500)\ **Post date:** [November 9, 2023, 3:54am UTC](https://forum.dynamobim.com/t/get-cad-overlapped-polycurves/95304/6 "2023-11-09T03:54:28Z")
@sovitek did you try with overlapped lines? ![Screenshot 2023-11-09 092502](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/c/2/c240f8a3ea8aa4401f61b0e88b8b2c6cc1d21409.png) ![null](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/0/e/0ef4315f0eaa3d9e8ddf6ced88d2a2d8df09f17f.png) ---
**Author:** ![sovitek](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/sovitek/32/116237_2.png) [@sovitek](https://forum.dynamobim.com/u/sovitek)\ **Post date:** [November 9, 2023, 4:56am UTC](https://forum.dynamobim.com/t/get-cad-overlapped-polycurves/95304/7 "2023-11-09T04:56:00Z")
nope, seems you have other issues as well… but here is a rough way there probably could work on your unordered cad files ![Skærmbillede 2023-11-09 070807](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/2/d/2d5c6f2853e3694f418a15c4e93b862f352d0268.png) ---
**Author:** ![sovitek](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/sovitek/32/116237_2.png) [@sovitek](https://forum.dynamobim.com/u/sovitek)\ **Post date:** [November 9, 2023, 6:26am UTC](https://forum.dynamobim.com/t/get-cad-overlapped-polycurves/95304/8 "2023-11-09T06:26:56Z")
btw there are something wrong with you cadfiles you have uploaded i guees… ![Skærmbillede 2023-11-09 072513](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/7/b/7bc7c8590fac29305e97e7030049ccef5e517564.png) ---
**Author:** ![vishalghuge2500](https://avatars.discourse-cdn.com/v4/letter/v/7ea924/32.png) [@vishalghuge2500](https://forum.dynamobim.com/u/vishalghuge2500)\ **Post date:** [November 9, 2023, 9:23am UTC](https://forum.dynamobim.com/t/get-cad-overlapped-polycurves/95304/9 "2023-11-09T09:23:38Z")
wow, thank you very much @sovitek If someone is looking for the same, it’s here for reference. ![image](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/e/b/eb6f8661873eaa64faa1a6e69fbe3d429b84036a.png) ![reference](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/4/b/4bd3cc88e13019db3def3e9d0ea6e1093f0f9164.png) ---
**Author:** ![c.poupin](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/c.poupin/32/89152_2.png) [@c.poupin](https://forum.dynamobim.com/u/c.poupin)\ **Post date:** [November 9, 2023, 1:00pm UTC](https://forum.dynamobim.com/t/get-cad-overlapped-polycurves/95304/10 "2023-11-09T13:00:59Z")
Hi, during import Revit converts the curves into polylines when they are attached (which follow each other) ![test import instaance](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/2/b/2bc6712562727629f6f074c6db657fd72b5aca9f.gif) so here another solution with Python ![image](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/7/6/76b9f966e4fc1af16ca36071139df1e4d84653d6.png) ```auto import clr import sys import System clr.AddReference('ProtoGeometry') from Autodesk.DesignScript.Geometry import * import Autodesk.DesignScript.Geometry as DS clr.AddReference('RevitAPI') import Autodesk from Autodesk.Revit.DB import * import Autodesk.Revit.DB as DB clr.AddReference('RevitNodes') import Revit clr.ImportExtensions(Revit.GeometryConversion) clr.AddReference('RevitServices') import RevitServices from RevitServices.Persistence import DocumentManager doc = DocumentManager.Instance.CurrentDBDocument out = [] def get_CAD_polylines(importinstance, layer_Name=""): """ get import instance polylines and create closed polygons """ out = [] opt = Options() geoSet = importinstance.get_Geometry(opt) for geo in geoSet: if isinstance(geo, GeometryInstance): for g in geo.GetInstanceGeometry(): if isinstance(g, DB.PolyLine): gStyle = doc.GetElement(g.GraphicsStyleId) gstyleName = gStyle.GraphicsStyleCategory.Name if System.String.IsNullOrEmpty(layer_Name) or layer_Name == gstyleName: ds_polygon = DS.Polygon.ByPoints([p.ToPoint() for p in g.GetCoordinates()]) out.append(ds_polygon) return out importinstance = UnwrapElement(IN[0]) layerName = IN[1] OUT = get_CAD_polylines(importinstance, layerName) ```