C# ModelVisual3D在DockPanel中未正确渲染

我对WPF非常陌生，我正在尝试创建一个应用程序，其中我将在一个选项卡中绘制一个地球仪，在第二个选项卡中绘制一个平面图。我能够在测试应用程序中绘制地球仪，代码如下：

    <Window x:Class="SphereTutorial.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:SphereTutorial"
        xmlns:earth="clr-namespace:SphereTutorial.Globe"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">
    <Grid>

        <Grid.Resources>
            <earth:SphereMeshGenerator x:Key="SphereGeometrySource1"/>
            <MeshGeometry3D x:Key="SphereGeometry1" 

                            Positions="{Binding Source={StaticResource 
                                  SphereGeometrySource1}, Path=Geometry.Positions}"

                            TriangleIndices="{Binding Source={StaticResource 
                                  SphereGeometrySource1}, Path=Geometry.TriangleIndices}"

                            TextureCoordinates="{Binding Source={StaticResource SphereGeometrySource1}, Path=Geometry.TextureCoordinates}"/>

        </Grid.Resources>
        <Grid.Background>
            Black
        </Grid.Background>
        <Viewport3D x:Name="mainScene3D">
            <Viewport3D.Camera>
                <PerspectiveCamera x:Name="mainCam" LookDirection="-1,0,0" Position="5,0,0" UpDirection="0,1,0"/>
            </Viewport3D.Camera>
            <ModelVisual3D>
                <ModelVisual3D.Content>
                    <Model3DGroup>
                        <AmbientLight Color="White"/>
                        <GeometryModel3D Geometry="{StaticResource SphereGeometry1}">
                            <GeometryModel3D.Material>
                                <MaterialGroup>
                                    <DiffuseMaterial>
                                        <DiffuseMaterial.Brush>
                                            <ImageBrush ImageSource="H:\C#\SphereTutorial\SphereTutorial\Images\Earth.jpg"/>
                                        </DiffuseMaterial.Brush>
                                    </DiffuseMaterial>
                                </MaterialGroup>
                            </GeometryModel3D.Material>
                        </GeometryModel3D>
                    </Model3DGroup>
                </ModelVisual3D.Content>
            </ModelVisual3D>
        </Viewport3D>
    </Grid>
</Window>

黑色
使用此处给出的代码：

    namespace VenProp.Sphere3D
{
    class SphereMeshGenerator
    {
        private int _slices = 100;
        private int _stacks = 50;
        private Point3D _center = new Point3D();
        private double _radius = 1;

        public int Slices
        {
            get { return _slices; }
            set { _slices = value; }
        }

        public int Stacks
        {
            get { return _stacks; }
            set { _stacks = value; }
        }

        public Point3D Center
        {
            get { return _center; }
            set { _center = value; }
        }

        public double Radius
        {
            get { return _radius; }
            set { _radius = value; }
        }

        public MeshGeometry3D Geometry
        {
            get
            {
                return CalculateMesh();
            }
        }


        private MeshGeometry3D CalculateMesh()
        {
            MeshGeometry3D mesh = new MeshGeometry3D();

            for (int stack = 0; stack <= Stacks; stack++)
            {
                double phi = Math.PI / 2 - stack * Math.PI / Stacks; 
                double y = _radius * Math.Sin(phi);
                double scale = -_radius * Math.Cos(phi);

                for (int slice = 0; slice <= Slices; slice++)
                {
                    double theta = slice * 2 * Math.PI / Slices; 
                    double x = scale * Math.Sin(theta); 
                    double z = scale * Math.Cos(theta); 

                    Vector3D normal = new Vector3D(x, y, z);  
                    mesh.Normals.Add(normal);
                    mesh.Positions.Add(normal + Center);  
                    mesh.TextureCoordinates.Add(new Point((double)slice / Slices, (double)stack / Stacks));
                }
            }

            for (int stack = 0; stack <= Stacks; stack++)
            {
                int top = (stack + 0) * (Slices + 1);
                int bot = (stack + 1) * (Slices + 1);

                for (int slice = 0; slice < Slices; slice++)
                {
                    if (stack != 0)
                    {
                        mesh.TriangleIndices.Add(top + slice);
                        mesh.TriangleIndices.Add(bot + slice);
                        mesh.TriangleIndices.Add(top + slice + 1);
                    }

                    if (stack != Stacks - 1)
                    {
                        mesh.TriangleIndices.Add(top + slice + 1);
                        mesh.TriangleIndices.Add(bot + slice);
                        mesh.TriangleIndices.Add(bot + slice + 1);
                    }
                }
            }

            return mesh;
        }
    }
}

名称空间VenProp.Sphere3D
{
类SphereMeshGenerator
{
私有int_切片=100；
私有整数栈=50；
私有点3D_中心=新点3D（）；
专用双半径=1；
公共整数切片
{
获取{return\u slices；}
设置{u slices=value；}
}
公共整数堆栈
{
获取{return\u stacks；}
设置{u stacks=value；}
}
公共点3D中心
{
获取{return\u center；}
设置{u center=value；}
}
公共双半径
{
获取{return\u radius；}
设置{u radius=value；}
}
公共网格几何三维几何
{
得到
{
返回CalculateMesh（）；
}
}
专用网格Geometry3D CalculateMesh（）
{
MeshGeometry3D mesh=新MeshGeometry3D（）；
对于（int stack=0；stack

出于测试目的，如果将ImageBrush替换为SolidColorBrush，则会出现相同的效果

有人知道发生了什么吗？另外，我还不熟悉堆栈溢出，因此如果有什么我可以做的，请让我知道。提前感谢您的帮助！
始终检查您的输出窗口是否存在绑定错误，如下所示：

System.Windows.Data错误：40:BindingExpression路径错误：'TriangleIndicies'在“对象”“MeshGeometry3D'（HashCode=33785274）”上找不到属性。BindingExpression:path=Geometry.TriangleIndicies；DataItem='SphereMeshGenerator'（HashCode=18281552）；目标元素为“MeshGeometry3D”（HashCode=340858117）；目标属性为“三角形索引”（类型为“Int32Collection”）

从三角形索引更改为三角形索引后，它工作正常：

谢谢！我知道这是件愚蠢的事。不过，我确实投了赞成票，因为我的代表人数不足15人，所以它说可以算数，但没有出现。现在我的代表人数超过15人，我就再投一次。再次感谢你的帮助！@MikeC:谢谢！
<Window x:Class="VenProp.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:VenProp"
        xmlns:sphere="clr-namespace:VenProp.Sphere3D"
        mc:Ignorable="d"
        Title="VenProp"
        Height="{Binding Source={x:Static SystemParameters.PrimaryScreenHeight}, Converter={local:RatioConverter}, ConverterParameter='0.9' }" 
        Width="{Binding Source={x:Static SystemParameters.PrimaryScreenWidth}, Converter={local:RatioConverter}, ConverterParameter='0.9' }"
        WindowStartupLocation="CenterScreen"
        Background="#FFE4E4E4">

    <!-- Window Resources -->
    <Window.Resources>
        <sphere:SphereMeshGenerator x:Key="SphereGeometrySource"/>
        <MeshGeometry3D x:Key="SphereGeometry"
                        Positions="{Binding Source={StaticResource SphereGeometrySource}, Path=Geometry.Positions}"
                        TriangleIndices="{Binding Source={StaticResource SphereGeometrySource}, Path=Geometry.TriangleIndicies}"
                        TextureCoordinates="{Binding Source={StaticResource SphereGeometrySource}, Path=Geometry.TextureCoordinates}"/>

    </Window.Resources>


    <!-- Overall Container is VERTICAL-->
    <DockPanel>

        <!-- Top Menu -->
        <Menu DockPanel.Dock="Top" HorizontalAlignment="Left" BorderBrush="Black">
            <MenuItem Header="_File"></MenuItem>
        </Menu>

        <!-- Main toolbar -->
        <ToolBar DockPanel.Dock="Top">
            <Button>
                <!-- Put image here-->
            </Button>
            <Button Content="Button2"/>
        </ToolBar>

        <!-- StatusBar -->
        <StatusBar x:Name="statusBar" DockPanel.Dock="Bottom"  />

        <!-- Inner container is horizontal -->
        <DockPanel>

            <Separator Width="2" Foreground="{x:Null}" Background="{x:Null}"/>
            <!-- Throw Tree into a dock panel with its label-->
            <StackPanel Width="310" DockPanel.Dock="Left" HorizontalAlignment="Left" Margin="0,0,0,2" Background="#FFE4E4E4">
                <Label Content="Object Browser" FontSize="12" Background="LightGray"/>
                <TreeView x:Name="ObjectBrowser" BorderThickness="2" Height="620" DockPanel.Dock="Top">
                    <TreeView.BitmapEffect>
                        <BevelBitmapEffect BevelWidth="5" Relief="0.4" LightAngle="320"/>
                    </TreeView.BitmapEffect>
                </TreeView>
            </StackPanel>
        </DockPanel>

        <Separator Width="10" Background="{x:Null}" Foreground="{x:Null}" RenderTransformOrigin="-0.45,0.541" />
        <!-- Tabs for graphics windows -->
        <TabControl x:Name="tabGraphics" BorderThickness="5">
            <TabControl.BitmapEffect>
                <BevelBitmapEffect BevelWidth="15" Relief="0.4"/>
            </TabControl.BitmapEffect>

            <!-- 3D Earth Model -->
            <TabItem x:Name="graphics3D" Header="3D Graphics">
                <DockPanel Background="Black">
                    <Viewport3D x:Name="mainScene3D">
                        <!--Camera-->
                        <Viewport3D.Camera>
                            <PerspectiveCamera x:Name="mainCam" LookDirection="-1,0,0" Position="5,0,0" UpDirection="0,1,0"/>
                        </Viewport3D.Camera>

                        <!--Earth Model-->
                        <ModelVisual3D>
                            <ModelVisual3D.Content>
                                <Model3DGroup>
                                    <AmbientLight Color="White"/>
                                    <GeometryModel3D Geometry="{StaticResource SphereGeometry}">
                                        <GeometryModel3D.Material>
                                            <MaterialGroup>
                                                <DiffuseMaterial>
                                                    <DiffuseMaterial.Brush>
                                                        <ImageBrush ImageSource="H:\C#\VenProp\VenProp\Images\Earth.jpg"/>
                                                    </DiffuseMaterial.Brush>
                                                </DiffuseMaterial>
                                            </MaterialGroup>
                                        </GeometryModel3D.Material>
                                    </GeometryModel3D>
                                </Model3DGroup>
                            </ModelVisual3D.Content>
                        </ModelVisual3D>
                    </Viewport3D>
                </DockPanel>
            </TabItem>


            <TabItem x:Name="graphics2D" Header="2D Graphics">
                <DockPanel Background="Gray">
                    <Image Source="H:\C#\VenProp\VenProp\Images/Earth.jpg"/>
                </DockPanel>
            </TabItem>
        </TabControl>
    </DockPanel>
</Window>