Hi everyone,

This thread is related to my last topic How to place family Instances according to the levels below them in python ; After placing my instances according my levels I should rotate the even ones by 180 degrees as shown in the reference below but they become miss placed because their point location which is their rotation axis is not in their center, so How can I set it to the center to avoid this issue

Here my script:

## Python_code

```
import sys
import clr
import math
clr.AddReference('ProtoGeometry')
from Autodesk.DesignScript.Geometry import *
clr.AddReference('RevitNodes')
import Revit
from Revit.Elements import *
R_exter_Shaft = IN[0]
Thk_Shaft = IN[1]
R_inter_Shaft = R_exter_Shaft - Thk_Shaft
H_Total = IN[2]
H_Shaft = IN[3]
Thk_Slab = IN[4]
H_1 = H_Shaft - Thk_Slab
Family_Cat = IN[5]
Family_Path = IN[6]
Material = IN[7]
Family1_name = 'Shaft1'
Family2_name = 'Shaft2'
Long_Trape = 0.8
angle_Trape = math.degrees(math.atan((Long_Trape/2) / R_inter_Shaft))
# Set Levels_List
n = int(math.ceil(H_Total / H_Shaft))
if H_Total % H_Shaft > 0:
H_2 = H_Total - (n-1) * H_Shaft
else:
H_2 = 0
#Shaft1_Profil
lst1 = []
Pt1 = Point.ByCoordinates( R_exter_Shaft, 0, -Thk_Slab)
lst1.append(Pt1)
Pt2 = Point.ByCoordinates( R_exter_Shaft, 0, H_1)
lst1.append(Pt2)
Pt3 = Point.ByCoordinates( R_inter_Shaft , 0, H_1)
lst1.append(Pt3)
Pt4 = Point.ByCoordinates( R_inter_Shaft , 0, -Thk_Slab)
lst1.append(Pt4)
vector = Vector.ByCoordinates(0, 0, 1)
Center_pt = Point.ByCoordinates(0, 0, 0)
Shaft1_Profil = Polygon.ByPoints(lst1)
Shaft1 = Solid.ByRevolve(Shaft1_Profil, Center_pt, vector, 0, 360)
#Shaft2_Profil
lst2 = []
Pt_1 = Point.ByCoordinates( R_exter_Shaft, 0, -Thk_Slab)
lst2.append(Pt_1)
Pt_2 = Point.ByCoordinates( R_exter_Shaft, 0, H_2)
lst2.append(Pt_2)
Pt_3 = Point.ByCoordinates( R_inter_Shaft , 0, H_2)
lst2.append(Pt_3)
Pt_4 = Point.ByCoordinates( R_inter_Shaft , 0, -Thk_Slab)
lst2.append(Pt_4)
vector = Vector.ByCoordinates(0, 0, 1)
Center_pt = Point.ByCoordinates(0, 0, 0)
Shaft2_Profil = Polygon.ByPoints(lst2)
Shaft2 = Solid.ByRevolve(Shaft2_Profil, Center_pt, vector, 0, 360)
Slab_Profil = Surface.ByPatch(Circle.ByCenterPointRadius(Center_pt, R_inter_Shaft ))
Slab = Surface.Thicken(Slab_Profil, -Thk_Slab, bool(0))
# opening profil to be subtract from the slab
Trape_arc = Arc.ByCenterPointRadiusAngle(Center_pt, R_inter_Shaft, -angle_Trape, angle_Trape, vector )
Pt1 = Trape_arc.StartPoint
Pt2 = Trape_arc.EndPoint
Pt3 = Pt1.Translate(-Long_Trape)
Pt4 = Pt2.Translate(-Long_Trape)
Line1 = Line.ByStartPointEndPoint(Pt3, Pt4)
Line2 = Line.ByStartPointEndPoint(Pt3, Pt1)
Line3 = Line.ByStartPointEndPoint(Pt4, Pt2)
Profil_Trape = Surface.ByPatch(PolyCurve.ByJoinedCurves([Line1, Line2, Trape_arc, Line3]))
Trape = Surface.Thicken(Profil_Trape, Thk_Slab, bool(0))
Finale_Slab = Solid.Difference(Slab, Trape)
# Shaft1 geometry and Family Type
lst3 = [Shaft1, Finale_Slab]
Final_Shaft1 = Solid.ByUnion(lst3)
Final_Shaft1 = Geometry.Translate(Final_Shaft1, -Thk_Slab)
Final_Shaft1 = Geometry.Scale(Final_Shaft1, 0.3048)
Final_Shaft1 = FamilyType.ByGeometry(Final_Shaft1, Family1_name, Family_Cat, Family_Path, Material, 'a')
# Shaft2 geometry and Family Type
lst4 = [Shaft2, Finale_Slab]
Final_Shaft2 = Solid.ByUnion(lst4)
Final_Shaft2 = Geometry.Translate(Final_Shaft2, -Thk_Slab)
Final_Shaft2 = Geometry.Scale(Final_Shaft2, 0.3048)
Final_Shaft2 = FamilyType.ByGeometry(Final_Shaft2, Family2_name, Family_Cat, Family_Path, Material, 'a')
levels = []
shafts = []
remainder = []
for i in range(n):
currentHeight = i * H_Shaft
name = "Niveau " + str(i+1)
level = Level.ByElevationAndName(currentHeight, name)
remainingHeight = H_Total - currentHeight
remainder.append(remainingHeight)
if remainingHeight <= H_Shaft:
if remainingHeight != H_Shaft:
Shaft2 = FamilyInstance.ByPointAndLevel(Final_Shaft2, Point.ByCoordinates(-R_exter_Shaft, -R_exter_Shaft, 0), level)
shafts.append(Shaft2)
else:
Shaft1 = FamilyInstance.ByPointAndLevel(Final_Shaft1, Point.ByCoordinates(-R_exter_Shaft, -R_exter_Shaft, 0), level )
shafts.append(Shaft1)
name = "Level " + str(i+2)
level = Level.ByElevationAndName(H_Total, name)
levels.append(level)
else:
Shaft1 = FamilyInstance.ByPointAndLevel(Final_Shaft1, Point.ByCoordinates(-R_exter_Shaft, -R_exter_Shaft, 0), level )
shafts.append(Shaft1)
shafts_1 = [FamilyInstance.SetRotation(i, 180) for count, i in enumerate(shafts) if count % 2 == 1]
for i in range(len(shafts),2):
for j in range(len(shafts_1)):
shafts_1[j] = shafts[i]
OUT = shafts
```

Thanks.