增大摄像机的远裁剪面造成子网格消失,远裁剪面改小就会出现，具体代码如下，工程见附件

//当前状态，sp的头部不可见，将远裁剪面550改成400头像就会出现，而sp1离摄像机比sp更远缺不影响。
	var camera = (scene.addChild(new Laya.Camera(0, 0.1, 550)));
	camera.transform.translate(new Laya.Vector3(250, 1, 0));
	var rotation = new Laya.Quaternion;
	Laya.Quaternion.lookAt(camera.position, new Laya.Vector3(0, 0, 0), camera.up, rotation);
	camera.transform.rotation = rotation;
	camera.clearColor = new Laya.Vector4(1, 1, 1, 1);
	camera.orthographicProjection 	= true;
	scene.currentCamera 			= camera;
	camera.orthographicVerticalSize = 400;

	//这个物体里摄像机更近
	var sp      = Laya.Sprite3D.load('res/01/mfs_01.lh');
	scene.addChild(sp);
	sp.on(Laya.Event.HIERARCHY_LOADED, this, function(){
		sp.transform.localPosition = new Laya.Vector3(1, 1, 1);
		var scale   = 1;
		var v3 = sp.transform.localScale;
		v3.x   = scale;
		v3.y   = scale;
		v3.z   = scale;
		sp.transform.localScale = v3;

	})
	
	//这个物体里摄像机更远
	var sp1      = Laya.Sprite3D.load('res/01/mfs_01.lh');
	scene.addChild(sp1);
	sp1.on(Laya.Event.HIERARCHY_LOADED, this, function(){
		sp1.transform.localPosition = new Laya.Vector3(-150, 1, 100);
		var scale   = 1;
		var v3 = sp1.transform.localScale;
		v3.x   = scale;
		v3.y   = scale;
		v3.z   = scale;
		sp1.transform.localScale = v3;

	})

附件：
test_3d.zip

test_3d.zip