internal static void OnScene(SceneView sceneView)
        {
            if (!RealtimeCSG.CSGSettings.EnableRealtimeCSG)
            {
                return;
            }

            if (EditorApplication.isPlayingOrWillChangePlaymode)
            {
                return;
            }
            UpdateLoop.UpdateOnSceneChange();

            if (!RealtimeCSG.CSGSettings.EnableRealtimeCSG)
            {
                ColorSettings.isInitialized = false;
            }
            else
            if (!ColorSettings.isInitialized)
            {
                if (Event.current.type == EventType.Repaint)
                {
                    ColorSettings.Update();
                }
            }

            if (!UpdateLoop.IsActive())
            {
                UpdateLoop.ResetUpdateRoutine();
            }

            if (Event.current.type == EventType.MouseDown ||
                Event.current.type == EventType.MouseDrag)
            {
                mousePressed = true;
            }
            else if (Event.current.type == EventType.MouseUp ||
                     Event.current.type == EventType.MouseMove)
            {
                mousePressed = false;
            }

            SceneDragToolManager.OnHandleDragAndDrop(sceneView);
            RectangleSelectionManager.Update(sceneView);
            EditModeManager.InitSceneGUI(sceneView);

            if (Event.current.type == EventType.Repaint)
            {
                MeshInstanceManager.RenderHelperSurfaces(sceneView);
            }

            if (Event.current.type == EventType.Repaint)
            {
                SceneToolRenderer.OnPaint(sceneView);
            }
            else
            //if (fallbackGUI)
            {
                SceneViewBottomBarGUI.ShowGUI(sceneView);
                SceneViewInfoGUI.DrawInfoGUI(sceneView);
            }

            EditModeManager.OnSceneGUI(sceneView);

            //if (fallbackGUI)
            {
                TooltipUtility.InitToolTip(sceneView);
                if (Event.current.type == EventType.Repaint)
                {
                    SceneViewBottomBarGUI.ShowGUI(sceneView);
                    SceneViewInfoGUI.DrawInfoGUI(sceneView);
                }
                if (!mousePressed)
                {
                    Handles.BeginGUI();
                    TooltipUtility.DrawToolTip(getLastRect: false);
                    Handles.EndGUI();
                }
            }

            if (Event.current.type == EventType.Layout)
            {
                var currentFocusControl = CSGHandles.FocusControl;
                if (prevFocusControl != currentFocusControl)
                {
                    prevFocusControl = currentFocusControl;
                    HandleUtility.Repaint();
                }
            }
        }
        internal static void OnScene(SceneView sceneView)
        {
            if (Event.current.type == EventType.MouseMove)
            {
                sceneView.Repaint();
            }

            sceneView.cameraSettings.dynamicClip         = false;
            sceneView.cameraSettings.easingEnabled       = false;
            sceneView.cameraSettings.accelerationEnabled = false;

            //if (sceneView.orthographic)
            //{
            //    sceneView.camera.nearClipPlane = 1;
            //    sceneView.camera.farClipPlane = 1001f;

            //    var camPos = sceneView.pivot;
            //    var camForward = sceneView.camera.transform.forward;
            //    for (int i = 0; i < 3; i++)
            //    {
            //        if (!FastApproximately(camForward[i], 0, .01f))
            //        {
            //            camPos[i] = 1000;
            //        }
            //    }
            //    sceneView.pivot = camPos;
            //}

            if (sceneView.orthographic)
            {
                if (Event.current.type == EventType.KeyDown &&
                    Event.current.keyCode == KeyCode.F)
                {
                    Event.current.Use();
                    sceneView.pivot = Vector3.zero;
                    if (TryGetSelectionBounds(out Bounds bounds))
                    {
                        var sz = bounds.extents.magnitude;
                        sz = Mathf.Clamp(sz, 0.05f, 500);
                        sceneView.pivot = bounds.center;
                        sceneView.size  = sz;
                    }
                }

                if (sceneView.size > 500)
                {
                    sceneView.size = 500;
                }

                if (sceneView.size < .05f)
                {
                    sceneView.size = .05f;
                }
            }

            CSGSettings.RegisterSceneView(sceneView);

            if (!RealtimeCSG.CSGSettings.EnableRealtimeCSG ||
                EditorApplication.isPlayingOrWillChangePlaymode)
            {
                return;
            }

            UpdateLoop.UpdateOnSceneChange();

            if (!RealtimeCSG.CSGSettings.EnableRealtimeCSG)
            {
                ColorSettings.isInitialized = false;
            }
            else if (!ColorSettings.isInitialized)
            {
                if (Event.current.type == EventType.Repaint)
                {
                    ColorSettings.Update();
                }
            }

            if (!UpdateLoop.IsActive())
            {
                UpdateLoop.ResetUpdateRoutine();
            }

            if (Event.current.type == EventType.MouseDown ||
                Event.current.type == EventType.MouseDrag)
            {
                mousePressed = true;
            }
            else if (Event.current.type == EventType.MouseUp ||
                     Event.current.type == EventType.MouseMove)
            {
                mousePressed = false;
            }

            SceneDragToolManager.OnHandleDragAndDrop(sceneView);
            RectangleSelectionManager.Update(sceneView);
            EditModeManager.InitSceneGUI(sceneView);

            if (Event.current.type == EventType.Repaint)
            {
                MeshInstanceManager.UpdateHelperSurfaces();
                SceneToolRenderer.OnPaint(sceneView);
            }
            else
            {
                SceneViewBottomBarGUI.ShowGUI(sceneView);
                SceneViewInfoGUI.DrawInfoGUI(sceneView);
            }

            //if(EditorWindow.mouseOverWindow == sceneView)
            {
                EditModeManager.OnSceneGUI(sceneView);

                TooltipUtility.InitToolTip(sceneView);

                if (!mousePressed)
                {
                    Handles.BeginGUI();
                    TooltipUtility.DrawToolTip(getLastRect: false);
                    Handles.EndGUI();
                }

                if (Event.current.type == EventType.Layout)
                {
                    var currentFocusControl = CSGHandles.FocusControl;
                    if (prevFocusControl != currentFocusControl)
                    {
                        prevFocusControl = currentFocusControl;
                        HandleUtility.Repaint();
                    }
                }
            }
        }