private static void ConstructScene(OpenGLWindow ogl)
 {
     ogl.AddGraph(new GraphObjects.Rectangle(new Vector3(3.0f, 0.0f, 0.1f), 10.0f, 5.0f));
     ogl.AddGraph(new GraphObjects.Triangle(new Vector3(5.0f, 5.0f, -10.0f), 10.0f, 5.0f));
     ogl.AddGraph(new GraphObjects.Sphere(new Vector3(-5.0f, 0.0f, -20.0f), 10.0f));
     ogl.AddGraph(new GraphObjects.Sphere(new Vector3(5.0f, 0.0f, -10.0f), 10.0f));
 }
 private static void ConstructScene(OpenGLWindow ogl)
 {
     GraphObjects.Triangle t2 = new GraphObjects.Triangle();
     t2.Vertices.Clear();
     t2.Vertices.Add(new OpenTK.Mathematics.Vector3(-1.0f, -0.6f, 0.0f));
     t2.Vertices.Add(new OpenTK.Mathematics.Vector3(-0.5f, -1.0f, 0.0f));
     t2.Vertices.Add(new OpenTK.Mathematics.Vector3(0.0f, 0.6f, 0.0f));
     ogl.AddGraph(t2);
     ogl.AddGraph(new GraphObjects.Triangle());
 }