Getting wrong stairs length/width from Python & Revit API

Developers
, ,
1

Hi everyone

I have some python code, apparently running ok, to get the horizontal area of two stair runs getting their line boundaries through Revit API. The code seems to be working, but I am getting all lengths multiplied by more or less 3, more or less (default width is 1.00 m and I’m getting 3.28 m).

Does anybody know what could be going on? Thank you all so much in advance

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image1691×857 107 KB 

stairs = UnwrapElement(IN[0])

runIds = stairs.GetStairsRuns()
runs = [stairs.Document.GetElement(runId) for runId in runIds]
bounds = [run.GetFootprintBoundary() for run in runs]

len = []	
for bound in bounds:
	for line in bound:
		len.append(line.ApproximateLength)
	

isplanar = [bound.HasPlane() for bound in bounds]
planes = [bound.GetPlane() for bound in bounds]
isopen = [bound.IsOpen() for bound in bounds]

isrect = []
areas = []
width = []
height = []

for plane in planes:
	isrect.append(bounds[planes.index(plane)].IsRectangular(plane))
	if isrect[planes.index(plane)] is True:
		width.append(bounds[planes.index(plane)].GetRectangularWidth(plane))
		height.append(bounds[planes.index(plane)].GetRectangularHeight(plane))
		areas.append(bounds[planes.index(plane)].GetRectangularWidth(plane)*bounds[planes.index(plane)].GetRectangularHeight(plane))
	else:
		areas.append('error')


OUT = runs, bounds, len, isplanar, isopen, isrect, areas, width, height
2

The units being returned are likely incorrect. 3.28 feet = 1 meter if memory serves.

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3

Yes, results are returned in FEET as Revits internal units. You could look for a conversion node or change units in the Python node.

decimal_feet_length = detail_line.GeometryCurve.Length
metric_length = UnitUtils.Convert(decimal_feet_length, DisplayUnitType.DUT_DECIMAL_FEET, DisplayUnitType.DUT_MILLIMETERS)
OUT = metric_length
1 Like
4

Thanks Jacob. Dividing the lengths by 3.28 certainly solved the issue, which is interesting because the first thing I did was to check the units in the Revit file and they were in metric system.

5

Thank you Sean. I tried that and I get the following error: “UnitUtils is not defined”. Is there any module or library I’d need to import?

6

Here is an example using Revit 2022, but the import should be the same.

import clr

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

OUT = UnitUtils.Convert(11.7,UnitTypeId.Feet,UnitTypeId.Millimeters)

Keep in mind too that in R2021 the DisplayUnitType was depreciated, and then in R2022 is it replaced by the SpecTypeId, ForgeTypeId and UnitTypeId classes.

3 Likes