RebarHookOrientation how to understand left right

Developers
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1

Hi all,

I still have some ambiguities and haven’t yet developed a consistent understanding of the RebarHookOrientation rule. There’s something that keeps tripping me up and preventing me from fully grasping the logic behind RebarHookOrientation.

In the example below, I tried to understand the hook orientation logic from the rebar shape “23” by exploring different cases: first, I edited the shape by reversing its direction; then I reversed its hooks; and finally, I attempted to recreate the original shape “23” by using the standard shape “00” and by applying the same parameters. However, I wasn’t able to reproduce it successfully, which has left me even more confused!?

hooks
hooks1863×1197 97.5 KB

here my used code:

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

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

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

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

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

doc = DocumentManager.Instance.CurrentDBDocument

top_bar_type = UnwrapElement(IN[0])
hook_type = UnwrapElement(IN[1])

cover = 0.05/0.3048

# Collect beams
all_beams = FilteredElementCollector(doc)\
    .OfCategory(BuiltInCategory.OST_StructuralFraming)\
    .WhereElementIsNotElementType()\
    .ToElements()

beam = all_beams[0]

curve = beam.Location.Curve
top_curve = Line.CreateBound(curve.GetEndPoint(1), curve.GetEndPoint(0))
width = beam.Symbol.LookupParameter("b").AsDouble()
top_curve = top_curve.CreateTransformed(Transform.CreateTranslation(XYZ.BasisY.Multiply(width/2 - cover)))


with Transaction(doc, "create rebars") as t:
    t.Start()
    top_rebar_curv = List[Curve]()
         
    top_rebar_curv.Add(top_curve)
    top_rebar = Rebar.CreateFromCurves(
        doc, RebarStyle.Standard,
        top_bar_type, hook_type, hook_type,
        beam, XYZ(0,-1,0), top_rebar_curv,
        RebarHookOrientation.Left, RebarHookOrientation.Right,
        True, True
    )
    top_rebar.GetShapeDrivenAccessor().SetLayoutAsFixedNumber(3, width-2*cover, True, True, True)
        
    t.Commit()

OUT = top_rebar, top_curve.ToProtoType()

Any further details or explanations that could help solidify my understanding would be greatly appreciated.

Thanks.

2

Everything looks correct other than the fact that the your code should have set the starting hook orientation to Left (when it’s reading and showing Right). What happens if you use SetHookOrientation to force the orientation again?

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