Collect Elements which Interesects a Line

1

Hello all,
With Dynamo & python I want to collect all walls which crossing a line. This line will be created by two points by user input. Just two clicks on the screen. I don’t want to use the Element.Geometry because that action is very slow with a large number of walls.
Can someone help me out? Thanx in advance.

import clr

clr.AddReference("ProtoGeometry")
from Autodesk.DesignScript.Geometry import *

clr.AddReference("RevitAPIUI")
from Autodesk.Revit.UI import TaskDialog

clr.AddReference('RevitAPI')
from Autodesk.Revit.DB import *

clr.AddReference("RevitNodes")
import Revit
clr.ImportExtensions(Revit.GeometryConversion)

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

doc = DocumentManager.Instance.CurrentDBDocument
uidoc = DocumentManager.Instance.CurrentUIApplication.ActiveUIDocument

TransactionManager.Instance.EnsureInTransaction(doc)


TaskDialog.Show("DynamoScripts", "Select two Points.")

userpoint1 = uidoc.Selection.PickPoint()
userpoint2 = uidoc.Selection.PickPoint()

line = Line.CreateBound(userpoint1, userpoint2)

coll = FilteredElementCollector(doc, doc.ActiveView.Id)
filt = ElementCategoryFilter(BuiltInCategory.OST_Walls)
walls = coll.WherePasses(filt).ToElements()

OUT =  line, walls
2

Hello. I am sure some of the nodes in @Thomas_Mahon’s Bimorph package should be able to solve your question. Specifically the Element.IntersectsElement. Just feed the line as one input and all the walls as the second. Only issue might be the Z axis, if you are clicking the points/need different levels.