Units in dynamo and python

3

Be aware when you obtain parameter values using python via API methods. It will return internal units if you do not convert the values:

image
image.png1824×905 133 KB

From the example parameter, we can obtain the numeric value as a double or as a string representation:

image
image.png796×514 35.2 KB

String representation:

import clr

#Import the Revit API
clr.AddReference('RevitAPI')
import Autodesk
from Autodesk.Revit.DB import *

pipe = UnwrapElement(IN[0])

x = pipe.get_Parameter(BuiltInParameter.RBS_PIPE_OUTER_DIAMETER).AsValueString()

OUT = x

Numeric value:

import clr

#Import the Revit API
clr.AddReference('RevitAPI')
import Autodesk
from Autodesk.Revit.DB import *

pipe = UnwrapElement(IN[0])

x = pipe.get_Parameter(BuiltInParameter.RBS_PIPE_OUTER_DIAMETER).AsDouble()

OUT = x

You can see from the image above, that the AsDouble value is Revit internal units (imperial) but since I am working with the metric system, I need to convert the value if I obtain the value via the API:

import clr

#Import the Revit API
clr.AddReference('RevitAPI')
import Autodesk
from Autodesk.Revit.DB import *

pipe = UnwrapElement(IN[0])

x = UnitUtils.ConvertFromInternalUnits(pipe.get_Parameter(BuiltInParameter.RBS_PIPE_OUTER_DIAMETER).AsDouble(), DisplayUnitType.DUT_MILLIMETERS)

OUT = x
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