unity 获取scene整体的bound包围盒以及center

如下：多场景的情况也适合

参考： https://gamedev.stackexchange.com/questions/134675/unity-bounds-includes-the-center-of-the-scene

        private List<Bounds> _worldBoundsList = new List<Bounds>();
        [Button("testBound")]
        public void TestBounds()
        {
            _worldBoundsList.Clear();
            for (int i = 0; i < SceneManager.sceneCount; i++)
            {
                var scene = SceneManager.GetSceneAt(i);
                GameObject[] gameObjects = scene.GetRootGameObjects();
                List<Renderer> renderers = new List<Renderer>();
                foreach (var o in gameObjects)
                {
                    renderers.AddRange(o.GetComponentsInChildren<Renderer>());
                }
                var worldBounds = renderers[0].bounds;
                for (int j = 1; j < renderers.Count; ++j)
                {
                    worldBounds.Encapsulate(renderers[j].bounds);
                }
                _worldBoundsList.Add(worldBounds);
            }
        }
        private void OnDrawGizmos()
        {
            foreach (var bounds in _worldBoundsList)
            {
                Gizmos.color = new Color(0f, 1f, 0f, 0.1f);
                Gizmos.DrawCube(bounds.center, bounds.size);

                Gizmos.color = new Color(0f, 1f, 0f, 1f);
                Gizmos.DrawWireCube(bounds.center, bounds.size);
            }
        }