unity中3dUI始终面向摄像机，跟随摄像机视角旋转而旋转

3dUI始终面向摄像机，广告牌效果

public class SimpleBillboard : MonoBehaviour
{public bool IsStopInSceneView = false;void OnDrawGizmos(){if (IsStopInSceneView == false && Application.isPlaying == false && SceneView.currentDrawingSceneView.camera != null){Rot(SceneView.currentDrawingSceneView.camera.transform);}}void Update(){Rot(Camera.main.camera.transform);}void Rot(Transform target){Plane plane = new Plane(target.forward, target.position);float dis;Vector3 tar = target.position;if (plane.Raycast(new Ray(this.transform.position, -target.forward),out dis) == true){tar = this.transform.position + (-target.forward * dis);}this.transform.LookAt(tar, Vector3.up);}
}

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