Get Face from CAD/dwg

Developers
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1

Hello,

I have a dwg file with a lot of hatches without polylines. I’m trying to get the face and from there I would like to get the boundaries because in Revit I have this, by hand:

image
image874×345 9.96 KB

but with my code I can not get it, just lines without order so it’s impossible to use them for creating floors. Any ideas?

Thanks in advance.

2

Why don’t you try to explode imported dwg, then the hatches will be converted as Filled region with boundaries.

3

Yes, you are right and finally I’m doing this. The problem is that the file is huge with a lot of layers, etc. so I’m losing a lot of time separating the dwg in several files (Revit can not explode big files). Thanks.

4

Hi,
The geometry of the hatches of ImportInstance are of type Solid (flat solid)
here is an example to find boundaries

image
image1185×776 57.9 KB 

import clr
import sys
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.ImportExtensions(Revit.Elements)


importinstance = UnwrapElement(IN[0])
out = []
opt = Options()
geoSet = importinstance.get_Geometry(opt)
for geo in geoSet:
	if isinstance(geo, GeometryInstance):
		for g in  geo.GetInstanceGeometry():
			if isinstance(g, Solid):
				for f in g.Faces:
					for loopCurve in f.GetEdgesAsCurveLoops():
						ds_polycurv = DS.PolyCurve.ByJoinedCurves(x.ToProtoType() for x in loopCurve)
						out.append(ds_polycurv)

OUT = out
5 Likes
5

Wasn’t recreating the Boundaries of the Hatches in AutoCAD an option?
Maybe even use a LISP to do that?

6

Hi @POBAvatarBIM

How about getting hatch boundaries by Layer Name:

image
image1362×590 76.5 KB

HatchBoundary

Here is slight modified version of @c.poupin:

import clr

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.ImportExtensions(Revit.Elements)

clr.AddReference("RevitServices")
import RevitServices
from RevitServices.Persistence import DocumentManager
from RevitServices.Transactions import TransactionManager

doc = DocumentManager.Instance.CurrentDBDocument
importinstance = UnwrapElement(IN[0])
out = []
opt = Options()
geoSet = importinstance.get_Geometry(opt)
for geo in geoSet:
	if isinstance(geo, GeometryInstance):
		for g in  geo.GetInstanceGeometry():
			if isinstance(g, Solid) and g.Volume == 0:
				for f in g.Faces:
					if doc.GetElement(f.GraphicsStyleId).GraphicsStyleCategory.Name == IN[1]:
						for loopCurve in f.GetEdgesAsCurveLoops():
							ds_polycurv = DS.PolyCurve.ByJoinedCurves(x.ToProtoType() for x in loopCurve)
							out.append(ds_polycurv)
OUT = out
4 Likes
7

Hello @Kulkul
Do you know why the script is not working?

image
image1411×792 84.1 KB

8

Could you drop here dwg file?

9

Hi @Kulkul,
I have attached the dwg file, I would be very grateful if you could take a look.
Referance Dwg.dwg (91.8 KB)

10

Try this:

import clr

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.ImportExtensions(Revit.Elements)

clr.AddReference("RevitServices")
import RevitServices
from RevitServices.Persistence import DocumentManager
from RevitServices.Transactions import TransactionManager

doc = DocumentManager.Instance.CurrentDBDocument
importinstance = UnwrapElement(IN[0])
out = []
opt = Options()
geoSet = importinstance.get_Geometry(opt)
for geo in geoSet:
	if isinstance(geo, GeometryInstance):
		for g in  geo.GetInstanceGeometry():
			if isinstance(g, Solid):
				for f in g.Faces:
					if doc.GetElement(f.GraphicsStyleId).GraphicsStyleCategory.Name == IN[1]:
						for loopCurve in f.GetEdgesAsCurveLoops():
							ds_polycurv = DS.PolyCurve.ByJoinedCurves(x.ToProtoType() for x in loopCurve)
							out.append(ds_polycurv)
OUT = out
2 Likes
11

@Kulkul thank you this is working for me :slight_smile: