wpf 3D,Viewort3D,

<Window x:Class="WpfApp5.Views.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:WpfApp5.Views"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Grid>   
        <Viewport3D>
            <Viewport3D.Camera>
                <PerspectiveCamera Position="-40,40,40" LookDirection="40,-40,-40"
                                   UpDirection="0,0,1"/>
            </Viewport3D.Camera>
            <ModelVisual3D>
                <ModelVisual3D.Content>
                    <Model3DGroup>
                        <DirectionalLight Color="White" Direction="-1,-1,-3"/>
                        <GeometryModel3D>
                            <GeometryModel3D.Geometry>
                                <MeshGeometry3D Positions="0,0,0 10,0,0 10,10,0 0,10,0 0,0,10
                                                10,0,10 10,10,10 0,10,10"
                                                TriangleIndices="0 1 3 1 2 3 0 4 3 4 7 3 4 6 7 4 5 6 0 4 1 1 4 5 1 2 6 6 5 1 2 3 7 7 6 2"/>
                            </GeometryModel3D.Geometry>
                            <GeometryModel3D.Material>
                                <DiffuseMaterial Brush="Red"/>
                            </GeometryModel3D.Material>
                        </GeometryModel3D>
                    </Model3DGroup>
                </ModelVisual3D.Content>
            </ModelVisual3D>
        </Viewport3D>
    </Grid>
</Window>