如何:使用关键帧对 3D 旋转进行动画处理
在下面的示例中,Rotation3DAnimationUsingKeyFrames 用于使 3D 对象旋转,同时它的旋转轴动画导致“摆动”。 此动画使用以下关键帧:
LinearRotation3DKeyFrame 用于在值之间创建平滑的线性内插。
DiscreteRotation3DKeyFrame 用于在值之间创建突然的“跳转”(无内插)。
SplineRotation3DKeyFrame 用于根据 KeySpline 属性在值之间创建变量转换。 在下面的示例中,动画的这一部分开始时缓慢,但在此时段快结束时呈指数级加速。
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">
<!-- The Viewport3D provides a rendering surface for 3-D visual content. -->
<Viewport3D Name="MyAnimatedObject"
ClipToBounds="True" Width="150" Height="150"
Canvas.Left="0" Canvas.Top="10">
<!-- Defines the camera used to view the 3D object. -->
<Viewport3D.Camera>
<PerspectiveCamera Position="0,0,2" LookDirection="0,0,-1" FieldOfView="60" />
</Viewport3D.Camera>
<!-- The ModelVisual3D children contain the 3D models -->
<Viewport3D.Children>
<!-- Two ModelVisual3D define the lights cast in the scene. Without light, the
3D object cannot be seen. Also, the direction of the lights affect shadowing. -->
<ModelVisual3D>
<ModelVisual3D.Content>
<DirectionalLight Color="#FFFFFF" Direction="-0.612372,-0.5,-0.612372" />
</ModelVisual3D.Content>
</ModelVisual3D>
<ModelVisual3D>
<ModelVisual3D.Content>
<DirectionalLight Color="#FFFFFF" Direction="0.612372,-0.5,-0.612372" />
</ModelVisual3D.Content>
</ModelVisual3D>
<ModelVisual3D>
<ModelVisual3D.Content>
<GeometryModel3D>
<!-- The geometry specifes the shape of the 3D plane. In this case, a flat sheet is created. -->
<GeometryModel3D.Geometry>
<MeshGeometry3D
TriangleIndices="0,1,2 3,4,5 "
Normals="0,0,1 0,0,1 0,0,1 0,0,1 0,0,1 0,0,1 "
TextureCoordinates="0,0 1,0 1,1 1,1 0,1 0,0 "
Positions="-0.5,-0.5,0.5 0.5,-0.5,0.5 0.5,0.5,0.5 0.5,0.5,0.5 -0.5,0.5,0.5 -0.5,-0.5,0.5 " />
</GeometryModel3D.Geometry>
<!-- The material specifies the material applied to the plane. In this case it is a linear gradient.-->
<GeometryModel3D.Material>
<MaterialGroup>
<DiffuseMaterial>
<DiffuseMaterial.Brush>
<LinearGradientBrush StartPoint="0,0.5" EndPoint="1,0.5">
<LinearGradientBrush.GradientStops>
<GradientStop Color="Yellow" Offset="0" />
<GradientStop Color="Red" Offset="0.25" />
<GradientStop Color="Blue" Offset="0.75" />
<GradientStop Color="LimeGreen" Offset="1" />
</LinearGradientBrush.GradientStops>
</LinearGradientBrush>
</DiffuseMaterial.Brush>
</DiffuseMaterial>
</MaterialGroup>
</GeometryModel3D.Material>
<!-- The Transform specifies how to transform the 3D object. The properties of the
Rotation object are animated causing the 3D object to rotate and "wobble" (see Storyboard below).-->
<GeometryModel3D.Transform>
<RotateTransform3D x:Name="myRotateTransform3D" >
<RotateTransform3D.Rotation>
<AxisAngleRotation3D Axis="0,3,0" Angle="40" />
</RotateTransform3D.Rotation>
</RotateTransform3D>
</GeometryModel3D.Transform>
</GeometryModel3D>
</ModelVisual3D.Content>
</ModelVisual3D>
</Viewport3D.Children>
<!-- Trigger the rotation animation when the 3D object loads. -->
<Viewport3D.Triggers>
<EventTrigger RoutedEvent="Viewport3D.Loaded">
<BeginStoryboard>
<Storyboard>
<!-- This animation animates the Rotation property of the RotateTransform
causing the 3D shape to rotate and wobble as the rotation angle and
axis are animated. -->
<Rotation3DAnimationUsingKeyFrames
Storyboard.TargetName="myRotateTransform3D"
Storyboard.TargetProperty="Rotation" >
<Rotation3DAnimationUsingKeyFrames.KeyFrames>
<!-- Using a LinearRotation3DKeyFrame, the object gradually rotates to an angle
of -60 degrees while the axis of rotation shifts (animates) to a new value. -->
<LinearRotation3DKeyFrame KeyTime="0:0:1">
<LinearRotation3DKeyFrame.Value>
<AxisAngleRotation3D Axis="1,0,1" Angle="-60" />
</LinearRotation3DKeyFrame.Value>
</LinearRotation3DKeyFrame>
<!-- Using a DiscreteRotation3DKeyFrame, the object suddenly rotates to the an angle
of 80 degrees on a new axis. This happens immdeiately after the first 1 and
a half seconds of the animation. -->
<DiscreteRotation3DKeyFrame KeyTime="0:0:1.5">
<DiscreteRotation3DKeyFrame.Value>
<AxisAngleRotation3D Axis="0,0,1" Angle="80" />
</DiscreteRotation3DKeyFrame.Value>
</DiscreteRotation3DKeyFrame>
<!-- Using a SplineRotation3DKeyFrame, the object rotates back to its starting position.
The animation starts out slowly at first and then speeds up. This KeyFrame ends
after the fourth second. -->
<SplineRotation3DKeyFrame KeySpline="0.6,0.0 0.9,0.00" KeyTime="0:0:4">
<SplineRotation3DKeyFrame.Value>
<AxisAngleRotation3D Axis="0,3,0" Angle="40" />
</SplineRotation3DKeyFrame.Value>
</SplineRotation3DKeyFrame>
</Rotation3DAnimationUsingKeyFrames.KeyFrames>
</Rotation3DAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Viewport3D.Triggers>
</Viewport3D>
</Canvas>
</Viewbox>
</DockPanel>
</Page>