Auto-Dimension from Walls

Is it possible to change the unit of measure to meters?

Hi Mark,

Is there a way for this python version to generate a single dimension line, instead of the chopped up version?

Thanks in advance



Apologies, this thread is so long I can’t even remember where it got to :slight_smile:

I think it is about list management… You need to group all the references for each dimension into a sub-list, if you are getting chopped dimensions you are getting a pair of references for each dimension.

If you are unsure, I would start with creating what you want using nodes and then translate to Python, I believe Genius Loci has lots of useful nodes.

I hope that helps,




I was talking about the script where there’s basically only a python node (code is below).
The rest of the script works like a charm by the way, amazing work.

I’ve narrowed it down to this area (I think) but no amount of tinkering works (it doesn’t help that I don’t understand python much)

Here’s the code you’ve provided

#thanks for all the help everyone
import clr

# Import RevitAPI
import Autodesk
from Autodesk.Revit.DB import *
import System

from Autodesk.DesignScript import Geometry as geom

# Import Element wrapper extension methods
import Revit
from Autodesk.Revit.DB import *

# Import ToProtoType, ToRevitType geometry conversion extension methods

from Autodesk.Revit.UI.Selection import ObjectType

from Autodesk.DesignScript import Geometry as geom

# Import DocumentManager and TransactionManager
import RevitServices
from RevitServices.Persistence import DocumentManager
from RevitServices.Transactions import TransactionManager

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

def isParallel(v1, v2):
    #it needs two vectors
    return v1.CrossProduct(v2).IsAlmostEqualTo(XYZ(0, 0, 0))

def isAlmostEqualTo(v1, v2):
    return v1.IsAlmostEqualTo(v2)

def isPerpendicular(v1, v2):
    if v1.DotProduct(v2)== 0:
        return True
        return False

def tolist(obj1):
	if hasattr(obj1,"__iter__"): return obj1
	else: return [obj1]

def CurveToVector(crv):
	vec = geom.Vector.ByTwoPoints(crv.StartPoint,crv.EndPoint)
	return vec

#set the wall orientation, depending on whether exterior or interior is selected
def wallNormal(wall, extOrint):
    if extOrint:
        wallNormal = wall.Orientation.ToVector()
        wallNormal = wall.Orientation.Negate().ToVector()
    return wallNormal

#this takes the wall location line, shifts it up the to the view cut plane
#and moves it out to the external edge of the wall
def locToCutCrv(wall, wallNormal, lineEndExtend):
	wallLn = wall.Location.Curve
	wallCrv = wallLn.ToProtoType()
	#take the level height, subtract the height of the wall base
	zOf = doc.ActiveView.GenLevel.Elevation-wallCrv.StartPoint.Z
	#get the cut plane offset of the view
	cPlaneH = doc.ActiveView.GetViewRange().GetOffset(PlanViewPlane.CutPlane) #the CutPlane enumeration is like a property of PBP?
	cPlaneHiMM = UnitUtils.ConvertFromInternalUnits(cPlaneH, DisplayUnitType.DUT_MILLIMETERS)	
	wallCrv = geom.Geometry.Translate(wallCrv, geom.Vector.ByCoordinates(0,0, zOf+cPlaneHiMM))
	wallwidthMM = UnitUtils.ConvertFromInternalUnits(wall.Width, DisplayUnitType.DUT_MILLIMETERS)
	wallCrv = geom.Geometry.Translate(wallCrv, wallNormal, (wallwidthMM/2))	

	#get wall curve info
	wallvec = CurveToVector(wallCrv)
	wallorig = geom.Curve.PointAtParameter(wallCrv,0.5)
	walldir1 = geom.Vector.ByTwoPoints(wallorig, wallCrv.StartPoint)
	walldir2 = geom.Vector.ByTwoPoints(wallorig, wallCrv.EndPoint)

	#move points
	ptMvSt = geom.Geometry.Translate(wallCrv.StartPoint, walldir1, lineEndExtend)
	ptMvEnd = geom.Geometry.Translate(wallCrv.EndPoint, walldir2, lineEndExtend)

	#create new line based on extended points
	#this is not a model line! that requires another method
	lineAtExternalEdgeAtCutPlaneHeight = geom.Line.ByStartPointEndPoint(ptMvSt, ptMvEnd).ToRevitType()
	return lineAtExternalEdgeAtCutPlaneHeight

offDist = IN[0]
extOrInt = IN[1]

#if the wall is exterior we need to extend the intersect line
#beyond the exterior face to pick up the intersecting walls
#if the wall is interior, we don't want to extend as far
if extOrInt:
    intersectLineEndExtend = 500
    intersectLineEndExtend = 0

#User Input
ref = uidoc.Selection.PickObject(ObjectType.Element, 'Select A Wall')
#define Targe Wall
targetWall = doc.GetElement(ref)

#let's go get the walls for finding references
intersectedWalls = []
#start by adding our target wall
#then get all the other walls in the view and test if they intersect the Target Wall
collectedWalls = FilteredElementCollector(doc, doc.ActiveView.Id).OfClass(Wall).ToElements()
for collectedWall in collectedWalls:
    if targetWall.Location.Curve.Intersect(collectedWall.Location.Curve) == SetComparisonResult.Overlap:

#Target Wall external line for intersect check
exLi = locToCutCrv(targetWall, wallNormal(targetWall, extOrInt), intersectLineEndExtend)

#Curve where the dimension will be located
offCrv = geom.Geometry.Translate(exLi.ToProtoType(), wallNormal(targetWall, extOrInt), (offDist))

#lets get the wall edges we want
#only get edges intersecting target side? no this is misleading... we want any reference hitting our external wall
#the problem is actually that the face itsetlf is registering the intersections we don't want e.g. the wrapping ends
frontFaceIW = []
vertEdges = []

opts = Options()
#without compute references, none of this works
opts.ComputeReferences = True
opts.IncludeNonVisibleObjects = True
opts.View = doc.ActiveView
for wallInt in intersectedWalls:
    for obj in wallInt.get_Geometry(opts):
        #walls also contain line geometry    
        if isinstance(obj, Solid): 
            for face in obj.Faces:
                #if face is normal is equal to wall normal it is the external face
                if isAlmostEqualTo(wallInt.Orientation, face.ComputeNormal(UV(0.5,0.5))):
            for edge in obj.Edges:
                #get edges which intersect
                edgeC = edge.AsCurve()
                edgeCNorm = edgeC.Direction.Normalize()
                #if front face edge and edge intersects line and edge is vertical up or vertical down add to list
                if edgeC.Intersect(exLi) != SetComparisonResult.Disjoint and (edgeCNorm.IsAlmostEqualTo(XYZ(0,0,1)) or edgeCNorm.IsAlmostEqualTo(XYZ(0,0,-1))):                    

#so we use the X+Y values as a unique identifier of location (we're less interested in
#the actual unique reference, there may be 2 in the same place)
#we will use these as filtering and sorting values
#if we wanted to use this on sections we'd want to use z value?
vertEdgesLoc = []
for v in vertEdges:
    vLoc = v.AsCurve().GetEndPoint(0).X + v.AsCurve().GetEndPoint(0).Y
    #getting some revit rounding errors, 7dp should be enough!

#trying to remove stray intersect edges from adjoining walls
#to identify them, they are not on an intersecting wall front face
#their faces are not both on the target wall

#so we need all the target wall faces
for obj in targetWall.get_Geometry(opts):
    #walls also contain line geometry    
    if isinstance(obj, Solid): 
        faceTW = obj.Faces

#create a holding list containing everything in vertEdges
strayEdges = []        
for v in vertEdges:

#start removing things from holding list to leave only the stray ones
for faIW in frontFaceIW:
    #if edge face 0&1 are both target wall faces we don't want to remove them
    i = 0
    length = len(strayEdges)
    while (i < length):
        if strayEdges[i].GetFace(0) in faceTW:
            length = length - 1
        elif strayEdges[i].GetFace(1) in faceTW:
            length = length - 1            
        #if our wall is external.... #if edge face is an intersecting wall's front face, we don't want it                
        elif strayEdges[i].GetFace(0) == faIW and extOrInt == True:
            length = length - 1 
        elif strayEdges[i].GetFace(1) == faIW and extOrInt == True:
            length = length - 1 
#            strayEdges.Remove(ed)
        #or if the edge reference is to a non-wall
        i = i+1

#if the wall is exterior, we want to remove references to internal wall edge
if extOrInt == True:
    length = len(vertEdgesLoc)
    strayCLoc2 = []
    while (i < length):
        for stray in strayEdges:
            stLoc = stray.AsCurve().GetEndPoint(0).X + stray.AsCurve().GetEndPoint(0).Y
            #getting eroneous values, Revit accuracy not good enough? round is built in method
            if round(vertEdgesLoc[i],7) == round(stLoc,7):
                length = length - 1    
        i = i+1

#sort the edges using the combined XY location value
vertEdgesSorted = [x for _,x in sorted(zip(vertEdgesLoc,vertEdges))]
vertEdgesLocSorted = sorted(vertEdgesLoc)

#only add uniquely located references
#this is awkward because we test 1 list, then add to the other list
#we need the Temp list, so we know what should be added to the Sub list
vertEdgeUniLocTemp = []
vertEdgeSub = ReferenceArray()
for eL, e in zip(vertEdgesLocSorted, vertEdgesSorted):
    if eL not in vertEdgeUniLocTemp:

#we want to pair up the references to create unique dims for the brick dim checker
#convoluted code, ref arrays seem their own beast!
outRefs = []
#define the overall list length
for i in range(vertEdgeSub.Size-1):
    #create the array here so the list nesting is correct
    vertEdgeAr = ReferenceArray()
    #define the sub list length
    while vertEdgeAr.Size < 2:
        #only get add 2 indices for each sub list

#OUT = len(strayEdges)
#start transaction
#create dimensions for each pair of referenes
for ref in outRefs:    
    dim = doc.Create.NewDimension(doc.ActiveView, offCrv.ToRevitType(), ref), outRefs, 
#finish transaction    

Hey, so first off, if you look here:

You will see that for every dimension we need a View, Line and Reference Array.

My code happens to have a Reference Array called vertEdgeSub, and you don’t need to break it down and pair it up, so I think you can just use that…

(delete ‘for ref in outRefs:’ and delete any spaces before ‘dim’ so it sits at the beginning of the line)

dim = doc.Create.NewDimension(doc.ActiveView, offCrv.ToRevitType(),vertEdgeSub)

If that doesn’t work, if you could post a screen grab of your code and the warning message above the Python node we can see what is going wrong.

Hope that helps,



Oh wow that is a usefull site.
When I start coding for real that is gonna be a huge help, thanks!

It didn’t work at first, said there was an inconsistency of references, but this did work so thank you!

dim = doc.Create.NewDimension(doc.ActiveView, offCrv.ToRevitType(), vertEdgeSub), outRefs, 
1 Like

someone resolves it? i need help :C

I have Revit 2022…

Change the following in the code (lines 76 & 78)
cPlaneHiMM = UnitUtils.ConvertFromInternalUnits(cPlaneH, DisplayUnitType.DUT_MILLIMETERS)
cPlaneHiMM = UnitUtils.ConvertFromInternalUnits(cPlaneH, UnitTypeId.Millimeters)

locPositionMM = UnitUtils.ConvertFromInternalUnits(locPos, DisplayUnitType.DUT_MILLIMETERS)
locPositionMM = UnitUtils.ConvertFromInternalUnits(locPos, UnitTypeId.Millimeters)


Same error here

has anyone had any luck with finding out the problem is on line 76 and line 124

Somebody can help me if this error
:Chart name, 1 Click Dimension Wall (1)

Node, Type, Message, URL
Python Script,WARNING,“PythonEvaluator. Evaluate.Traceback operation failed (most recent call last): File “””“, line 124,
in File “””“, line 76, in locToCutCrvNameError: global name ‘DisplayUnitType’ is not defined”,undefined