Scripting Reference
Handles.DrawWireArc

static function DrawWireArc (center : Vector3, normal : Vector3, from : Vector3, angle : float, radius : float) : void

Parameters

NameDescription
center The center of the circle.
normal The normal of the circle.
from The direction of the point on the circle circumference, relative to the center, where the arc begins.
angle The angle of the arc, in degrees.
radius The radius of the circle

Description

Draw a circular arc in 3D space.


Wire Arc in the Scene View.

    // Create a 180 degrees wire arc with a ScaleValueHandle attached to the disc
    // that lets you modify the "shieldArea" var in the WireArcExample.js
    
    @CustomEditor (WireArcExample)
    class DrawWireArc extends Editor {
        function OnSceneGUI () {
            Handles.color = Color.red;
            Handles.DrawWireArc(target.transform.position, 
                target.transform.up, 
                -target.transform.right, 
                180, 
                target.shieldArea);
            
            target.shieldArea = 
            Handles.ScaleValueHandle(target.shieldArea,
                            target.transform.position + target.transform.forward*target.shieldArea,
                            target.transform.rotation,
                            1,
                            Handles.ConeCap,
                            1);
        }
    }

And the script attached to this Handle:

    // WireArcExample.js
    
    var shieldArea : float = 5;