2D-Text at world coodinates

      float angle = 0;
 
        public override void OnRenderFrame(RenderFrameEventArgs e)
        {
            GL.Clear(ClearBufferMask.ColorBufferBit |
                     ClearBufferMask.DepthBufferBit);
 
            GL.MatrixMode(MatrixMode.Modelview);
            GL.LoadIdentity();
 
            angle += 0.1f;
 
            Glu.LookAt(Vector3.Zero, Vector3.UnitZ, Vector3.UnitY);
 
            GL.Rotate(angle, Vector3.UnitZ);
 
 
            GL.Begin(BeginMode.Triangles);
 
            GL.Color3(Color.LightYellow);  GL.Vertex3(-1.0f, -1.0f, 4.0f);
            GL.Color3(Color.LightYellow); GL.Vertex3(1.0f, -1.0f, 4.0f);
            GL.Color3(Color.LightSkyBlue); GL.Vertex3(0.0f, 1.0f, 4.0f);
 
            GL.End();
 
            int[] Viewport = new int[4];
            double[] ModelViewMatrix = new double[16];
            double[] ProjectionMatrix = new double[16];
 
            GL.GetInteger(GetPName.Viewport, Viewport);
            GL.GetDouble(GetPName.ModelviewMatrix, ModelViewMatrix);
            GL.GetDouble(GetPName.ProjectionMatrix, ProjectionMatrix);
 
            Vector3 winPos;
            Glu.Project(new Vector3(-1.0f,-1.0f,4.0f),
                ModelViewMatrix,
                ProjectionMatrix,
                Viewport,
                out winPos);
 
            printer.Begin();
 
            GL.Translate(winPos);            
 
            printer.Print("Vertex 1", sans_serif, Color.SpringGreen);
 
            printer.End();
 
            SwapBuffers();
        }