//
        public void changeShaders(string shaderName = Globals.defaultShaderName)
        {
            // reset current shaders
            setShaders(Globals.defaultShaderName);
            _aGoShaderChanged.Clear();

            // set new shaders
            _aGoShaderChanged = _levelEditor.getOverlappingObjects(_trfmAimTool.position, _rendererAimTool.bounds.extents);
            setShaders(shaderName);
        }