[]3D怎么使用canvas渲染，无论怎么看都是webgl

3D怎么使用canvas渲染
 Laya3D.init(0, 0);
Laya.stage.scaleMode = Laya.Stage.SCALE_FULL;
Laya.stage.screenMode = Laya.Stage.SCREEN_NONE;
Laya.Stat.show();
var scene = Laya.stage.addChild(new Laya.Scene());

var camera = scene.addChild(new Laya.Camera(0, 0.1, 100));
camera.transform.translate(new Laya.Vector3(0, 0.5, 1));
camera.transform.rotate(new Laya.Vector3( -15, 0, 0), true, false);

var layaMonkey = scene.addChild(Laya.Sprite3D.load("../../res/threeDimen/skinModel/LayaMonkey/LayaMonkey.lh"));
alert(Laya.Render.isWebGL)