Helix工具包旋轉3D模型

Question

我是WPF的新手，我正在嘗試制作一個顯示3D模型的程序（保存在我的計算機上）並根據按鈕點擊進行旋轉。 我想有三個按鈕來圍繞x，y和z軸旋轉對象。 我有代碼顯示模型，但我不確定如何使用按鈕單擊旋轉它。 這是我到目前為止所擁有的;

C＃

public MainWindow()
{
    InitializeComponent();
    ModelVisual3D device3D = new ModelVisual3D();
    device3D.Content = Display3d(MODEL_PATH);

    // Add to view port
    viewPort3d.Children.Add(device3D);
}

private Model3D Display3d(string model)
{
    Model3D device = null;
    try
    {
        //Adding a gesture here
        viewPort3d.RotateGesture = new MouseGesture(MouseAction.LeftClick);

        //Import 3D model file
        ModelImporter import = new ModelImporter();

        //Load the 3D model file
        device = import.Load(model);
    }
    catch (Exception e)
    {
        // Handle exception in case can not find the 3D model file
        MessageBox.Show("Exception Error : " + e.StackTrace);
    }
    return device;
}
private void buttonX_Click(object sender, RoutedEventArgs e)
{
    //not sure what to put in here
}

XAML

<Grid Margin="0,0,6,94" RenderTransformOrigin="0.5,0.5">
    <Grid.RenderTransform>
        <TransformGroup>
            <ScaleTransform/>
            <SkewTransform/>
            <RotateTransform Angle="-0.275"/>
            <TranslateTransform/>
        </TransformGroup>
    </Grid.RenderTransform>
    <helix:HelixViewport3D x:Name="viewPort3d" ZoomExtentsWhenLoaded="true" Margin="0,0,10,64" >
        <!-- Remember to add light to the scene -->
        <helix:DefaultLights/>
        <ModelVisual3D x:Name="Models"/>
    </helix:HelixViewport3D>
    <Rectangle Fill="#FFF4F4F5" HorizontalAlignment="Left" Height="100" Margin="417,219,0,0" Stroke="Black" VerticalAlignment="Top" Width="100" RenderTransformOrigin="0.146,-0.196"/>
    <Button x:Name="buttonX" Content="ButtonX" HorizontalAlignment="Left" Height="30" Margin="216,356,0,-60" VerticalAlignment="Top" Width="104" Click="buttonX_Click"/>
</Grid>

我目前正在使用Helix工具包，但如果有更簡單的方法，請告訴我。

Answer 1

根據你問題的措辭，我假設你想要旋轉模型而不是相機，在這種情況下將device3D保存device3D某處並執行此操作：

    private void buttonX_Click(object sender, RoutedEventArgs e)
    {
        var axis = new Vector3D(0, 0, 1);
        var angle = 10;

        var matrix = device3D.Transform.Value;
        matrix.Rotate(new Quaternion(axis, angle));

        device3D.Transform = new MatrixTransform3D(matrix);
    }