如何：在三维场景中对照相机位置和方向进行动画处理
下面的示例演示如何在三维场景中对照相机的位置及其指向的方向进行动画处理。 执行此操作的方法是：使用 Point3DAnimation 和 Vector3DAnimation 分别对 PerspectiveCamera 的 Position 和 LookDirection 属性进行动画处理。 您可以使用此种动画来更改响应某事件的、旁观者的场景视图。
示例
<Page xmlns="https://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="https://schemas.microsoft.com/winfx/2006/xaml" >
<DockPanel>
<Viewbox>
<Canvas Width="321" Height="201">
<Viewport3D Name="MyAnimatedObject"
ClipToBounds="True" Width="150" Height="150"
Canvas.Left="0" Canvas.Top="10">
<!-- Defines the camera used to view the 3D object. The position and direction of this
camera is animated in the Storyboard below. -->
<Viewport3D.Camera>
<PerspectiveCamera x:Name="myPerspectiveCamera" Position="0,0,2" LookDirection="0,0,-1"
FieldOfView="45" />
</Viewport3D.Camera>
<Viewport3D.Children>
<ModelVisual3D>
<ModelVisual3D.Children>
<!-- This resource defines the 3D cube that is used in this example.-->
<StaticResource ResourceKey="PictureCubeModelVisual3DResource" />
</ModelVisual3D.Children>
</ModelVisual3D>
</Viewport3D.Children>
<Viewport3D.Triggers>
<EventTrigger RoutedEvent="Viewport3D.Loaded">
<BeginStoryboard>
<Storyboard>
<!-- This animation moves the camera around the object. The object is not
changing position or rotating but moving the camera makes it appear that
it is.-->
<Point3DAnimation
Storyboard.TargetName="myPerspectiveCamera"
Storyboard.TargetProperty="Position"
From="0,0,2" To="1,2,3" Duration="0:0:4" RepeatBehavior="Forever"/>
<!-- As the position of the camera changes using the Point3DAnimation
above, the direction the camera is pointing swivels to keep the object
within the view of the camera. -->
<Vector3DAnimation
Storyboard.TargetName="myPerspectiveCamera"
Storyboard.TargetProperty="LookDirection"
From="0,0,-1" To="-1,-2,-3" Duration="0:0:4" RepeatBehavior="Forever"/>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Viewport3D.Triggers>
</Viewport3D>
</Canvas>
</Viewbox>
</DockPanel>
</Page>