wpf - 如何在 WPF/XAML 中为 MeshGeometry3D 中的点设置动画？

Question

是否可以为 MeshGeometry3D 中的点设置动画？在 XAML 或 C# 代码中。

我似乎找不到一种方法来随着时间的推移为点的 X、Y、Z 位置设置动画。有什么想法吗？

这可能有帮助.. WPF and 3D how do you change a single position point in 3D space?

Answer 1

也许不漂亮

XAML

<Viewport3D>
    <ModelVisual3D x:Name="VisualHost"/>
</Viewport3D>

代码隐藏

public partial class MyUserControl : UserControl
{
    #region TargetZ Property
    public static readonly DependencyProperty TargetZProperty =
        DependencyProperty.RegisterAttached("TargetZ", typeof(double), typeof(MyUserControl), new PropertyMetadata(TargetZ_Changed));

    private static void TargetZ_Changed(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        var positions = ((MeshGeometry3D)((GeometryModel3D)d).Geometry).Positions;
        var point = positions[0];
        positions[0] = new Point3D(point.X, point.Y, point.Z + (double)e.NewValue);
    }

    public void SetTargetZ(GeometryModel3D d, double value)
    {
        d.SetValue(TargetZProperty, value);
    }
    public double GetTargetZ(GeometryModel3D d)
    {
        return (double)d.GetValue(TargetZProperty);
    }
    #endregion

    public MyUserControl()
    {
        InitializeComponent();
    }

    private void SetNewZ(double newValue)
    {
        var animationTime = TimeSpan.FromSeconds(1);

        var model = (GeometryModel3D)VisualHost.Content;

        var zAnimation = new DoubleAnimation(newValue, animationTime) { FillBehavior = FillBehavior.HoldEnd };
        model.BeginAnimation(TargetZProperty, zAnimation);
    }
}