# Curtainwall outline curve
**URL:** https://forum.dynamobim.com/t/curtainwall-outline-curve/20887
**Category:** Geometry
**Created:** [April 10, 2018, 7:40am UTC](https://forum.dynamobim.com/t/curtainwall-outline-curve/20887 "2018-04-10T07:40:10Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@3Pinter](https://forum.dynamobim.com/u/3Pinter)
#### Post date: [April 10, 2018, 7:40am UTC](https://forum.dynamobim.com/t/curtainwall-outline-curve/20887/1 "2018-04-10T07:40:11Z")
Guys,
I’m fiddling with curtain walls, the curves atm. which I want to dimension in the end.
To my knowledge curtain walls are actually
- a collection of grids,
- the grids have mullions assigned
So if I want to obtain the geometric references of the curtain wall (the outline):
- get the bounding box of a curtain wall since the curtain wall itself has no geometry
- neglect the y-value
- min, max point will allow me to define the outline ???
Python/api gives me boundingbox too as only option?
---
### Author:  [@jacob.small](https://forum.dynamobim.com/u/jacob.small)
#### Post date: [April 10, 2018, 10:29am UTC](https://forum.dynamobim.com/t/curtainwall-outline-curve/20887/2 "2018-04-10T10:29:23Z")
Curtain walls have a location line and a height as well. Might be better to work with those and extrude the location line by the height.
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### Author:  [@3Pinter](https://forum.dynamobim.com/u/3Pinter)
#### Post date: [April 10, 2018, 12:34pm UTC](https://forum.dynamobim.com/t/curtainwall-outline-curve/20887/3 "2018-04-10T12:34:49Z")
Don’t think that will work, I need to get a list of ReferenceArrays in order to place some dimensions in the end.
`NewLinearDimension Method (View, Line, ReferenceArray, DimensionType)`
Does anyone have a clue how to get a list of ReferenceArray’s??
---
### Author:  [@3Pinter](https://forum.dynamobim.com/u/3Pinter)
#### Post date: [April 11, 2018, 4:24pm UTC](https://forum.dynamobim.com/t/curtainwall-outline-curve/20887/4 "2018-04-11T16:24:36Z")
pfff how annoying. I can’t figure it out.
How do I get to the reference of a curtain wall?
```
import clr
clr.AddReference('ProtoGeometry')
from Autodesk.DesignScript.Geometry import *
clr.AddReference("RevitNodes")
import Revit
from Revit.Elements import *
clr.AddReference('RevitAPI')
from Autodesk.Revit.DB import *
clr.AddReference("RevitServices")
import RevitServices
from RevitServices.Persistence import DocumentManager
from RevitServices.Transactions import TransactionManager
doc = DocumentManager.Instance.CurrentDBDocument
#gc = UnwrapElement(IN[0]).GeometryCurve
c = UnwrapElement(IN[0])
for l in cw:
t = l.CurtainGrid.NumULines
u = l.get_Geometry
#h = l.get_Geometry.Faces
#g = l.CurtainGrid.NumVLines
OUT = t,u
```
u outputs Ironpython.Runtime.Types.BuiltinFunction … which is good I guess? Is that how the references are retrieved?