Wrong rebar Hook orientation REVIT API

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,
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Hello,
after some test here is an approach by selecting a face, I could not explain everything because the structure is really out of my area of ​​​​expertise, and this part of the API seems really very complex to understand

image
image782×574 68 KB

test rebar on beam

import sys
import clr
import math
from System.Collections.Generic import IList, List

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

clr.AddReference('RevitAPIUI')
from Autodesk.Revit.UI import *
from Autodesk.Revit.UI.Selection import *

clr.AddReference('RevitServices')
import RevitServices
from RevitServices.Persistence import DocumentManager
from RevitServices.Transactions import TransactionManager
doc = DocumentManager.Instance.CurrentDBDocument
uiapp = DocumentManager.Instance.CurrentUIApplication
uidoc = uiapp.ActiveUIDocument

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


Btm_bar_type = UnwrapElement(IN[0])
Top_bar_type = UnwrapElement(IN[1])
bar_Hook_type = UnwrapElement(IN[2])
cover = IN[3]/0.3048
spacing = 0.10/0.3048

TaskDialog.Show("Selection", "Pick a Face")
ref = uidoc.Selection.PickObject(ObjectType.Face, "Pick a Face")
# get Face Geometry
sel_elem = doc.GetElement(ref)
tf1 = sel_elem.GetTotalTransform()
face = sel_elem.GetGeometryObjectFromReference(ref)
# get the instance of Face Normal (Transformed)
faceNormal = tf1.OfVector(face.FaceNormal)
#beam_width
width = doc.GetElement(sel_elem.GetTypeId()).LookupParameter("b").AsDouble()
# get beam direction
beam_direction = sel_elem.Location.Curve.Direction
#
# create an transfrom for onternal offset 
tf2 = DB.Transform.CreateTranslation(face.FaceNormal.Negate() * 0.1)
curveLoop = face.GetEdgesAsCurveLoops()[0]
# move curveloop inside the beam
# compute a transformation translation
offset_curvloop = DB.CurveLoop.CreateViaOffset(curveLoop, -0.1, face.FaceNormal)
# apply the fully transform to get the instance of Geometry
offset_curvloop = DB.CurveLoop.CreateViaTransform(offset_curvloop, tf1.Multiply(tf2))
# get top and bottom curves
curvesorted = sorted(offset_curvloop, key = lambda x : x.Length)
bottomLine, topLine = sorted(curvesorted[2:], key = lambda x : x.GetEndPoint(0))

TransactionManager.Instance.ForceCloseTransaction()
t = Transaction(doc, "Script Rebar")
t.Start()

# compute the normal for Rebar
if faceNormal.CrossProduct(beam_direction).IsAlmostEqualTo(XYZ(0,0,-1)):
	normT = topLine.Direction.CrossProduct(XYZ.BasisZ)
	normB = topLine.Direction.CrossProduct(XYZ.BasisZ)
else:
	normT = topLine.Direction.CrossProduct(XYZ.BasisZ).Negate()
	normB = topLine.Direction.CrossProduct(XYZ.BasisZ).Negate()

Top_rebar = Rebar.CreateFromCurves(doc, 
								RebarStyle.Standard, 
								Btm_bar_type, 
								bar_Hook_type, 
								bar_Hook_type, 
								sel_elem, 
								normT, 
								List[DB.Curve]([topLine]), 
								RebarHookOrientation.Left, 
								RebarHookOrientation.Right, 
								True, 
								True)
								
Top_rebar.GetShapeDrivenAccessor().SetLayoutAsFixedNumber(math.ceil((width-2*cover)/spacing), width-2*cover, True, True, True)

								
Btm_rebar = Rebar.CreateFromCurves(doc, 
								RebarStyle.Standard, 
								Btm_bar_type, 
								bar_Hook_type, 
								bar_Hook_type, 
								sel_elem, 
								normB, 
								List[DB.Curve]([bottomLine]), 
								RebarHookOrientation.Left, 
								RebarHookOrientation.Right, 
								True, 
								True)
								
Btm_rebar.GetShapeDrivenAccessor().SetLayoutAsFixedNumber(math.ceil((width-2*cover)/spacing), width-2*cover, True, True, True)

t.Commit()
t.Dispose()

OUT = sel_elem, face, bottomLine.ToProtoType(), topLine.ToProtoType()
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