IntersectAll Dynamo Revit - Python

Dynamo is a visual programming tool used for building complex programs using visual elements. Revit is a Building Information Modeling (BIM) software, commonly used in architecture, engineering, and construction industry for creating, designing, and managing building data. IntersectAll is a node in Dynamo that creates intersection lines based on geometries provided.

The IntersectAll node in Dynamo for Revit can be used to create intersection lines between geometries such as lines, arcs, circles, and splines. This node is like the Intersect node, but it produces all possible intersections, not just the first.

Syntax

IntersectAll(geom1: Geometry, geom2: Geometry, [geom3: Geometry, ...]) -> List

The IntersectAll function takes two or more geometries as input, and returns a list of intersection points or lines. The input geometries can be of any type, such as lines, arcs, circles, splines, surfaces or solids.

Example

import clr
clr.AddReference('RevitAPI')
from Autodesk.Revit.DB import *
clr.AddReference('RevitAPIUI')
from Autodesk.Revit.UI import *
clr.AddReference('System')
from System.Collections.Generic import List

uiapp = __revit__.ActiveUIDocument
app = uiapp.Application
uidoc = uiapp.ActiveUIDocument
doc = uidoc.Document

# Get all walls in the view
walls = FilteredElementCollector(doc, doc.ActiveView.Id).OfCategory(BuiltInCategory.OST_Walls).ToElements()

# Get all floors in the view
floors = FilteredElementCollector(doc, doc.ActiveView.Id).OfCategory(BuiltInCategory.OST_Floors).ToElements()

# Create a list to store all intersection lines
intersectlines = []

# Loop through each wall and floor and find intersection lines
for wall in walls:
    for floor in floors:
        if IntersectAll(wall.Location.Curve, floor.FloorShape).Count > 0:
            # Append the intersection lines to the list
            intersectlines.extend(IntersectAll(wall.Location.Curve, floor.FloorShape))

# Create a new detail line for each intersection line
for intersectline in intersectlines:
    line = doc.Create.NewDetailCurve(doc.ActiveView, intersectline).Curve

In this example, we first import the necessary modules and classes from the Revit API. We then get all the walls and floors in the active view, and loop through each wall and floor to find intersection lines. The IntersectAll function is used to find all the intersection lines between the wall and floor, and the resulting lines are added to a list. Finally, new detail lines are created for each intersection line in the list.

Conclusion

IntersectAll node in Dynamo for Revit is a powerful tool that allows for easy creation of intersection lines between geometries in a BIM model. With the help of Python and Revit API, it is possible to automate complex building tasks using this node, saving time and increasing efficiency.