3d场景怎么截屏

mag

var gv = GameView.gameView.gameLayer;
        var htmlC: Laya.HTMLCanvas = gv.drawToCanvas(Laya.stage.width, Laya.stage.height, 0, 0);
        UIMain.shotPic = htmlC.getTexture();这样截取出来的画面是没有着色器和光照的

Scene3D如何正确截屏??