private void HandleShadingModelComboBoxSelectedIndexChanged(object sender, EventArgs e) { Face face = (Face)viewer3D.Scene.ObjectList.Find(o => o is Face); if (face != null) // Should always be the case.. { if (shadingModelComboBox.SelectedItem.ToString() == "Flat") { viewer3D.UseSmoothShading = false; face.ShadingModel = OpenTK.Graphics.OpenGL.ShadingModel.Flat; viewer3D.ForceRender(); } else { viewer3D.UseSmoothShading = true; face.ShadingModel = OpenTK.Graphics.OpenGL.ShadingModel.Smooth; viewer3D.ForceRender(); } } }