private void CenterMass_Click(object sender, RoutedEventArgs e) { try { if (CenterMass.Content == null) { Point3D point = BP.GetCenterOffMass().Item1; Material material = new DiffuseMaterial(new SolidColorBrush(Color.FromArgb(255, 230, 30, 30))); var meshBuilder = new MeshBuilder(false, false); meshBuilder.AddSphere(point, 0.3); var Mesh = meshBuilder.ToMesh(true); CenterMass.Content = new GeometryModel3D { Geometry = Mesh, Material = material }; } else { CenterMass.Content = null; } } catch (Exception ex) { MessageBox.Show(ex.Message); } }