Why do GL calls draw on the whole window when my IMGUIContainer is inside a TwoPaneSplitView?

Unity Engine
,
1

Hello!

I’m trying to draw a rectangle with GL inside of a TwoPanelSplitView, but my window ends up completely black when I use GL.Clear, rather than just the area inside the panel. What am I doing wrong?

Thanks!

Code for reference:

        private void HandleDrawing()
        {
            if (Event.current.type is EventType.Repaint)
            {
                _width = position.width;
                _height = position.height;
                _shader = Shader.Find("Hidden/Internal-Colored");
     
                _mat = new Material(_shader)
                {
                    hideFlags = HideFlags.HideAndDontSave
                };

                _mat.SetPass(0);
                GL.PushMatrix();
     
                GL.Clear(true, true, Color.black);

                GL.PopMatrix();
                Handles.EndGUI();
            }
        }

        private void Update()
        {
            Repaint();
        }

        public void CreateGUI()
        {
            // Each editor window contains a root VisualElement object
            VisualElement root = rootVisualElement;
         
            // Separate the window into variables and plot
            var splitView = new TwoPaneSplitView(0, 200, TwoPaneSplitViewOrientation.Horizontal);
            splitView.usageHints = UsageHints.GroupTransform;
            root.Add(splitView);
         
            // Panels from the splitview
            var leftPane = new VisualElement();
            splitView.Add(leftPane);
            var rightPane = new VisualElement();
            rightPane.usageHints = UsageHints.GroupTransform;
            splitView.Add(rightPane);
         
            // Add a GameObject to expose possible variables
            var gameObjectField = new ObjectField("Object to analyze");
            leftPane.Add(gameObjectField);

            var glContent = new IMGUIContainer(HandleDrawing);
            glContent.usageHints = UsageHints.DynamicColor;
         
            rightPane.Add(glContent);
        }
2

Nevermind, I could solve this by drawing a rectangle with Vertexes instead of Using GL.Clear :slight_smile: