如何在wpf GeometryModel3D中绘制钻石？

GeometryModel3D diamondModel = new GeometryModel3D();

MeshGeometry3D diamondGeometry = new MeshGeometry3D();

// 定义钻石的顶点
diamondGeometry.Positions.Add(new Point3D(0, 0, 0)); // 顶点A
diamondGeometry.Positions.Add(new Point3D(1, 1, 1)); // 顶点B
diamondGeometry.Positions.Add(new Point3D(-1, 1, 1)); // 顶点C
diamondGeometry.Positions.Add(new Point3D(-1, -1, 1)); // 顶点D
diamondGeometry.Positions.Add(new Point3D(1, -1, 1)); // 顶点E
diamondGeometry.Positions.Add(new Point3D(0, 0, -1)); // 顶点F

// 定义钻石的面
diamondGeometry.TriangleIndices.Add(0); // 面1
diamondGeometry.TriangleIndices.Add(1);
diamondGeometry.TriangleIndices.Add(2);

diamondGeometry.TriangleIndices.Add(0); // 面2
diamondGeometry.TriangleIndices.Add(2);
diamondGeometry.TriangleIndices.Add(3);

diamondGeometry.TriangleIndices.Add(0); // 面3
diamondGeometry.TriangleIndices.Add(3);
diamondGeometry.TriangleIndices.Add(4);

diamondGeometry.TriangleIndices.Add(0); // 面4
diamondGeometry.TriangleIndices.Add(4);
diamondGeometry.TriangleIndices.Add(1);

diamondGeometry.TriangleIndices.Add(1); // 面5
diamondGeometry.TriangleIndices.Add(5);
diamondGeometry.TriangleIndices.Add(2);

diamondGeometry.TriangleIndices.Add(2); // 面6
diamondGeometry.TriangleIndices.Add(5);
diamondGeometry.TriangleIndices.Add(3);

diamondGeometry.TriangleIndices.Add(3); // 面7
diamondGeometry.TriangleIndices.Add(5);
diamondGeometry.TriangleIndices.Add(4);

diamondGeometry.TriangleIndices.Add(4); // 面8
diamondGeometry.TriangleIndices.Add(5);
diamondGeometry.TriangleIndices.Add(1);

diamondModel.Geometry = diamondGeometry;

// 设置钻石的材质和外观
MaterialGroup diamondMaterial = new MaterialGroup();
diamondMaterial.Children.Add(new DiffuseMaterial(new SolidColorBrush(Colors.Blue)));
diamondMaterial.Children.Add(new SpecularMaterial(new SolidColorBrush(Colors.White), 30));
diamondModel.Material = diamondMaterial;

// 将钻石模型添加到场景中
Model3DGroup scene = new Model3DGroup();
scene.Children.Add(diamondModel);

// 创建Viewport3D并将场景添加到其中
Viewport3D viewport = new Viewport3D();
viewport.Children.Add(new ModelVisual3D() { Content = scene });

// 将Viewport3D添加到WPF窗口中
myWindow.Content = viewport;