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我需要在 helix-toolkit 视口中显示一个圆形圆环。我找到的最接近的选项是 HelixVisual3D，但它有开放式末端。所以我尝试创建自己的类来绘制它，使用 HelixVisual3D 和两个细圆锥来闭合末端。我使用了他们的 Building Demo 中的类作为参考，所以我想出了这个：

public class TorusVisual3D : UIElement3D
{ 
    public static readonly DependencyProperty AngleProperty = DependencyPropertyEx.Register("Angle", 90, (s, e) => s.AppearanceChanged());
    public static readonly DependencyProperty RadiusProperty = DependencyPropertyEx.Register("Radius", 0.35, (s, e) => s.AppearanceChanged());
    public static readonly DependencyProperty DiameterProperty = DependencyPropertyEx.Register("Diameter", 0.1, (s, e) => s.AppearanceChanged());

    private GeometryModel3D torus = new GeometryModel3D();
    private GeometryModel3D cap1 = new GeometryModel3D();
    private GeometryModel3D cap2 = new GeometryModel3D();

    public TorusVisual3D()
    {
        AppearanceChanged();

        Model3DGroup model = new Model3DGroup();

        model.Children.Add(this.torus);
        model.Children.Add(this.cap1);
        model.Children.Add(this.cap2);

        this.Visual3DModel = model;
    }


    public double Angle
    {
        get
        { 
            return (double)this.GetValue(AngleProperty); 
        }
        set 
        { 
           this.SetValue(AngleProperty, value); 
        }
    }

    public double Radius
    {
        get
        {
            return (double)this.GetValue(RadiusProperty);
        }
        set
        {
            this.SetValue(RadiusProperty, value);
        }
   }

    public double Diameter
    {
        get
        {
            return (double)this.GetValue(DiameterProperty);
        }
        set
        {
            this.SetValue(DiameterProperty, value);
        }
    }

    private void AppearanceChanged()
    {
        Material mat = MaterialHelper.CreateMaterial(Utils.GetRandomColor());

        HelixVisual3D h = new HelixVisual3D();
        h.Origin = new Point3D(0, 0, 0);
        h.Diameter = Diameter;
        h.Turns = Angle / 360.0;
        h.Radius = Radius;
        h.Length = 0;
        h.BackMaterial = mat;
        h.Material = mat;
        h.UpdateModel();
        this.torus = h.Model;

        MeshBuilder cap1Builder = new MeshBuilder(false, false);
        Point3D p1 = new Point3D(0, Radius, 0);
        cap1Builder.AddCone(p1, new Vector3D(0, 1, 0), h.Diameter / 2, h.Diameter / 2, 0.0001, true, true, 40);
        this.cap1.Material = MaterialHelper.CreateMaterial(Colors.Yellow); 
        this.cap1.Geometry = cap1Builder.ToMesh();


        MeshBuilder cap2Builder = new MeshBuilder(false, false);
        Point3D p2 = new Point3D(-1, 0, 0);
        cap2Builder.AddCone(p2, new Vector3D(1, 0, 0), h.Diameter / 2, h.Diameter / 2, 0.0001, true, true, 40);
        this.cap2.Material = MaterialHelper.CreateMaterial(Colors.Red);
        this.cap2.Geometry = cap2Builder.ToMesh();
    }
}

要绘制它，我使用以下代码：

TorusVisual3D t = new TorusVisual3D();
t.Angle = m_angle;
t.Radius = m_radius1;
t.Diameter = m_radius2 * 2.0;
t.Transform = new TranslateTransform3D(0, 0, 0);
ModelVisual3D model = new ModelVisual3D();
model.Children.Add(t);
var container = new ContainerUIElement3D();
container.Children.Add(model);
viewport.Children.Add(container);

问题是螺旋线是使用默认值（半径=0.35，直径=0.1 和角度=90）绘制的，并且永远不会再次更新。无论我在属性上设置什么值，它都保持不变。两个圆柱体都正确更新，只是螺旋没有。

我在做什么错？

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