private function loop(e : Event) : void {
                            // shader.data.size.value = [ 10 + Math.random()*20 ];
                            // if (state == 3) shader.data.size.value = [ 0 + Math.random()*5 ];
                            stack.filters = [filter];       
                    }
  
              private var shader:Shader;
              private var filter:ShaderFilter;