public void EditorUpdate ()
{
if (script==null) return; //in case of re-assigning missing script
//finding terrain
if (script.terrain==null)
try { script.terrain = script.GetComponent<Terrain>(); }
catch (Exception e) { UnityEditor.EditorApplication.update -= EditorUpdate; e.GetType(); } //get type to disable warinng 'never used'
if (script.terrain==null) return;
RefreshTerrainGui();
}