// Simple script that creates a Magenta Slide Handle that
// points to (0,0,0) nomatter where the target GameObject is located.

@CustomEditor (Slide)
class SliderHandleJS extends Editor {
function OnSceneGUI () {
Handles.color = Color.magenta;
target.vectorPoint = Handles.Slider (target.vectorPoint,
Vector3.zero - target.transform.position);
if (GUI.changed)
EditorUtility.SetDirty (target);
}
}

// Usage: Place this script on the Game Object you want to use the
// editor-created slide handle.

@script ExecuteInEditMode()

var vectorPoint : Vector3 = Vector3(0,0,0);

function Update() {
Debug.Log("Looking at: " + vectorPoint);
}