How to create spiral stair geometry from Revit element in dynamo?
that above picture Dynamo can’t crate that.
Thank a lot .
Yes but stair created by cast in place type can’t get geometry. T T
my purpose is get volume of concrete from that.
True, it is even not in schedules. We model our stairs as GenericModel because of 3D/2D representation. It is in a simple way better.
For taging we use 1mm stair, that is on Auxilery Workset.
It’s good choice. 
Thank for your recommend.
Hi @peerawit.ru ,
You can acquire the Solids of the GeometryInstances that makes up the stair, and from there get the Volume. It does require API calls through Python though.
Here’s an example:
Python script:
import clr
#Import the Revit API
clr.AddReference('RevitAPI')
import Autodesk
from Autodesk.Revit.DB import *
def convertfrominternal(val):
return UnitUtils.ConvertFromInternalUnits(val, DisplayUnitType.DUT_CUBIC_METERS)
stair = UnwrapElement(IN[0])
opts = Options()
opts.ComputeReferences = True
geom = stair.get_Geometry(opts)
output = []
for i in geom:
solids_lst = i.GetInstanceGeometry()
temp = []
for j in solids_lst:
temp.append(j.Volume)
output.append(sum(temp))
OUT = convertfrominternal(sum(output))
Mind that I’m converting this to cubic meters, as this OOTB, comes out in imperial units if not converted.
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Can i convert Revit.DB.GeometryInstance to Solid in Dynamo?
I want to find separate face area from solid for defindes something.
thank a lot.
1 Like
Something like this maybe?
Python Script:
import clr
clr.AddReference('ProtoGeometry')
from Autodesk.DesignScript.Geometry import *
#Import the Revit API
clr.AddReference('RevitAPI')
import Autodesk
from Autodesk.Revit.DB import *
#Import ToDSType(bool) extensions method
clr.AddReference('RevitNodes')
import Revit
clr.ImportExtensions(Revit.Elements)
clr.ImportExtensions(Revit.GeometryConversion)
def convertfrominternal(val):
return UnitUtils.ConvertFromInternalUnits(val, DisplayUnitType.DUT_CUBIC_METERS)
stair = UnwrapElement(IN[0])
opts = Options()
opts.ComputeReferences = True
geom = stair.get_Geometry(opts)
output = []
for i in geom:
#output.append(i.GetInstanceGeometry())
solids_lst = i.GetInstanceGeometry()
temp = []
for j in solids_lst:
faces = j.Faces
for f in faces:
if f.Area > 0:
edgeLoops = f.EdgeLoops
temp2 = []
for edges in edgeLoops:
for e in edges:
temp2.append(e.AsCurve().ToProtoType())
temp.append(temp2)
output.append(temp)
OUT = output
Edit: We can’t turn the Revit API solids into Dynamo solids using the ProtoType() method. It will fail the same way as the Element.Geometry node. I don’t have a better answer, then to recreate the geometry from Edges extracted from the Revit API Solids. Maybe someone with more knowledge about this could supply a better answer 
5 Likes
Lovely
No probs 