Handles.FreeRotateHandle

static function FreeRotateHandle (rotation : Quaternion, position : Vector3, size : float) : Quaternion

Parameters

Name	Description
rotation	Orientation of the handle.
position	Center of the handle in 3D space.
size	The size of the handle. Note: Use HandleUtility.GetHandleSize where you might want to have constant screen-sized handles.

Description

Make an unconstrained rotation handle.

The handle can rotate freely on all axes.

FreeRotate handle seen in the Scene View.

// Create a simple rotate handle (half scale) on the 
// target object that lets you freely rotate
// the Object Without having to select the "Rotate" button

@CustomEditor (FreeRotate)
class FreeRotateHandleJS extends Editor {
    function OnSceneGUI () {
        target.rot = Handles.FreeRotateHandle(target.rot, target.transform.position, 0.5);
        if (GUI.changed)
            EditorUtility.SetDirty (target);
    }
}

And the script attached to this Handle:

@script ExecuteInEditMode()

var rot : Quaternion = Quaternion.identity;

function Update () {
    transform.rotation = rot;
}