Hello all,
I would like to place dimensions between Separation lines and the reference lines (X and Y) of Air Terminals.
The goal is to place dimensions from the nearest separation line (for spaces) to the X or Y reference line of the air terminal.
I have a Python script to use in a Dynamo node but to let this work, I have to change the family of the air terminal and delete the reference lines wich I’d rather not.
Herewith the previous Python script.
Many thanks in advance 
(special thanks to Søren Villadsen who helped me the last time!!)…
import clr
clr.AddReference("RevitAPI")
from Autodesk.Revit.DB import *
clr.AddReference("RevitServices")
import RevitServices
from RevitServices.Persistence import DocumentManager
from RevitServices.Transactions import TransactionManager
doc = DocumentManager.Instance.CurrentDBDocument
active_view = doc.ActiveView
input_in0 = IN[0]
elements = UnwrapElement(input_in0) if isinstance(input_in0, list) else [UnwrapElement(input_in0)]
def get_best_reference(el):
for name in ["Center (Left/Right)", "Center (Front/Back)", "Centerline", "Center"]:
try:
ref = el.GetReferenceByName(name)
if ref:
return ref
except:
continue
opt = Options()
opt.ComputeReferences = True
opt.IncludeNonVisibleObjects = True
opt.View = active_view
geo = el.get_Geometry(opt)
if geo:
for obj in geo:
if isinstance(obj, GeometryInstance):
for inst_obj in obj.GetInstanceGeometry():
if hasattr(inst_obj, "Reference") and inst_obj.Reference:
return inst_obj.Reference
elif hasattr(obj, "Reference") and obj.Reference:
return obj.Reference
return None
all_curves = FilteredElementCollector(doc, active_view.Id).OfClass(CurveElement).ToElements()
output_dimensions = []
if elements:
TransactionManager.Instance.EnsureInTransaction(doc)
for el in elements:
if not el:
continue
try:
if hasattr(el.Location, "Point"):
ref_pt = el.Location.Point
else:
continue
e_ref = get_best_reference(el)
if not e_ref:
continue
hits_x = []
hits_y = []
for curve_el in all_curves:
c_geom = curve_el.GeometryCurve
if c_geom.Reference is None:
continue
proj = c_geom.Project(ref_pt)
if not proj:
continue
target_pt = proj.XYZPoint
dist = proj.Distance
to_hit_vec = (target_pt - ref_pt).Normalize()
if abs(to_hit_vec.X) > abs(to_hit_vec.Y):
hits_x.append({'dist': dist, 'ref': c_geom.Reference, 'pt': target_pt, 'geom': c_geom})
else:
hits_y.append({'dist': dist, 'ref': c_geom.Reference, 'pt': target_pt, 'geom': c_geom})
for bucket in [hits_x, hits_y]:
if not bucket:
continue
closest = sorted(bucket, key=lambda d: d['dist'])[0]
ref_array = ReferenceArray()
ref_array.Append(e_ref)
ref_array.Append(closest['ref'])
proj_result = closest['geom'].Project(closest['pt'])
raw_param = proj_result.Parameter
derivatives = closest['geom'].ComputeDerivatives(raw_param, False)
tangent = derivatives.BasisX.Normalize()
normal_vec = XYZ(-tangent.Y, tangent.X, 0)
try:
dim_line = Line.CreateUnbound(ref_pt, normal_vec)
output_dimensions.append(doc.Create.NewDimension(active_view, dim_line, ref_array))
except:
dim_line = Line.CreateBound(ref_pt, closest['pt'])
output_dimensions.append(doc.Create.NewDimension(active_view, dim_line, ref_array))
except Exception as e:
output_dimensions.append(str(e))
TransactionManager.Instance.TransactionTaskDone()
OUT = output_dimensions