How to animate a Point in a MeshGeometry3D in WPF/XAML? - wpf

Question

Is it possible to animate points in a MeshGeometry3D? either in XAML or in C# code behind.
I can't seem to find a way to animate the X,Y,Z locations of points over time.
Any ideas?
This may help.. WPF and 3D how do you change a single position point in 3D space?

Answer 1

Maybe not pretty
Xaml
<Viewport3D>
<ModelVisual3D x:Name="VisualHost"/>
</Viewport3D>
CodeBehind
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);
}
}