private void runTestButtonClick(object sender, RoutedEventArgs e) { mainViewport.Children.Clear(); blacklines.Points.Clear(); redlines.Points.Clear(); //create new buffers for lines blacklines.Color = Colors.Black; redlines.Color = Colors.Red; redlines.Thickness = 4; resultBox.Text = "Testing...\n"; try { Shapes.Shape s = Shapes.Primitives.Rectangle(new Vector3D(1, 2, 0)); //create the main scene MeshGeometry3D triangleMesh = new MeshGeometry3D(); s.BuildMeshGeometry3D(triangleMesh); Color c = Colors.Blue; c.A = 100; Material material = new DiffuseMaterial(new SolidColorBrush(c)); GeometryModel3D triangleModel = new GeometryModel3D(triangleMesh, material); ModelVisual3D model = new ModelVisual3D(); model.Content = triangleModel; //if (ShowFaces) mainViewport.Children.Add(model); //if (ShowConvexes) s.BuildScreenSpaceLines(redlines); resultBox.Text += "Done\n"; } catch (System.ApplicationException ex) { resultBox.Text += ex.Message + "\n"; } finally { mainViewport.Children.Add(redlines); mainViewport.Children.Add(blacklines); } }