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相机的位置进行动画处理,并为其指向方向进行动画处理。 这是通过使用 Point3DAnimation 和 Vector3DAnimation 分别对 PerspectiveCamera 的 Position 和 LookDirection 属性进行动画处理来实现的。 你可以使用这样的动画来更改场景的旁观者视图,以响应事件。
示例
<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://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>