How do I get the curve orientation of an element using REVIT API?

[josenlee34_21]

I have tried this code, does not seem to work... can anyone please advice on how do I go abot in finding it?

using Autodesk.Revit.DB;
using Autodesk.Revit.UI;

public class ArcOrientation
{
public void GetArcOrientation(Document doc, ElementId arcElementId)
{
// Get the element by ID
Element element = doc.GetElement(arcElementId);

if (element is CurveElement curveElement)
{
// Get the curve from the curve element
Curve curve = curveElement.GeometryCurve;

if (curve is Arc arc)
{
// Get the orientation (rotation) of the arc
XYZ orientation = arc.Normal;

// Print or use the orientation information as needed
TaskDialog.Show("Arc Orientation", $"Arc element has orientation: {orientation}");
}
else
{
TaskDialog.Show("Arc Orientation", "Selected element is not an Arc.");
}
}
else
{
TaskDialog.Show("Arc Orientation", "Selected element is not a CurveElement.");
}
}
}

[ennujozlagam]

check this if can help?

https://thebuildingcoder.typepad.com/blog/2018/03/create-2d-arc-and-filter-for-intersecting-elements...

post here

https://forums.autodesk.com/t5/revit-api-forum/bd-p/160

[josenlee34_21]

Hmm I dont think it explains how to find the orientation of the curve wall though. 

[jeremy_tammik]

All curve elements are parametrised:

http://thebuildingcoder.typepad.com/blog/2010/01/curves.html

You can use the GetEndParameter method to obtain the start and end parameters:

https://www.revitapidocs.com/2024/0f4b2c25-35f8-4e3c-c71a-0d41fb6935ce.htm

Check the other Curve class members for other operations with the curve parameters:

https://www.revitapidocs.com/2024/92a388f3-4949-465c-b938-2906ff6bdf5b.htm

[SimonaQQ]

What does curve orientation refer to?
Arc. Normal refers to the direction of the plane where arc is located. If you are referring to this, I think there is no problem with the code.
Or what you want is something similar to Line Arc of Direction Direction?
Or is it clockwise or counterclockwise?

[josenlee34_21]

It refers to finding directions of points on the curved wall.

[josenlee34_21]

I have added some stuff and it runs now but there is now output... Kindly advise on how to fix this problem 🙏

The updated code is below:

public class ArcOrientation : IExternalCommand
{
public Result Execute(
ExternalCommandData commandData,
ref string message,
ElementSet elements)
{
// Get the current Revit application and document
UIApplication uiApp = commandData.Application;
UIDocument uiDoc = uiApp.ActiveUIDocument;
Document doc = uiDoc.Document;

// Prompt the user to select an element
Reference pickedRef = uiDoc.Selection.PickObject(ObjectType.Element, "Select an element");

if (pickedRef != null)
{
ElementId arcElementId = pickedRef.ElementId;

// Get the element by ID
Element element = doc.GetElement(arcElementId);

if (element is CurveElement curveElement)
{
// Get the curve from the curve element
Curve curve = curveElement.GeometryCurve;

if (curve is Arc arc)
{
// Get the orientation (rotation) of the arc
XYZ orientation = arc.Normal;

// Print or use the orientation information as needed
TaskDialog.Show("Arc Orientation", $"Arc element has orientation: {orientation}");
}
else
{
TaskDialog.Show("Arc Orientation", "Selected element is not an Arc.");
}
}
else
{
TaskDialog.Show("Arc Orientation", "Selected element is not a CurveElement.");
}
}
else
{
TaskDialog.Show("Arc Orientation", "No element selected.");
}

return Result.Succeeded;
}
}
}

[Mohamed_Arshad]

HI @josenlee34_21 

   In above discussion you have mentioned that you need to find direction of points on the curved wall. So can you explain which point Direction need with small image or representation. So that we can help you easily.

[SimonaQQ]

It sounds like: finding the tangent direction at a certain point on the curve.
If that is indeed the case, Curve.ComputeDerivatives, this Api returns a Transform where BasisX is the tangent direction at this point.

[josenlee34_21]

Something like this. Any random point on the curved surface will do