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WPF 3D 穿梭效果，用WPF也凑凑热闹
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前言
CSS 效果博客地址：3D 穿梭效果？使用 CSS 轻松搞定
相对CSS和UWP，老牌的WPF对于3D效果的操作是相对繁琐的。要首先做出3D模型，接着旋转XY轴，其次调整Z轴拉伸，最后一步调整FOV。穿梭效果要靠这Z轴拉伸的数字决定，图中是10-20。
当然最难的是动画的首尾衔接。我们来一步一步的做。
制作3D模型
这一块可以直接用不用2D控件其实没啥可以研究，所以就直接是3D模型，让图片以贴图的形式存在。至于3D模型制作，总结一点就是由左到右开始。
1、Positions
3D模型是三角组成，所以描述一个物体的样子时候，尽可能画三角形。每个点就是顶点，如果存在相同的顶点，选择一个就行。描述顶点的时候是XYZ，当你正面看物体，物体的Z轴是指向你的方向为正方向。Y轴是向上为正，X轴是向右为正。
这里值得注意的是，为了方便 ，建议使用左 左下 右下 右上的顺序去定义点。
这个模型的顶点定义就是 P1(x,y,z), P2(x,y,z) ,P3(x,y,z) ,P4(x,y,z)
2、TriangleIndices
这个就是 描述 这些顶点是如何组成三角形。当我们认为一个面是正面时，要记得逆时针定义顶点集合下标。顶点集合就是Positions，内容就是你输入的坐标点，下标由0开始。背面为顺时针。
3、TextureCoordinates
这个是材质的定位顺序，这个比较2D坐标系，和其他的不同。也就是左上角为0，0 右下角为1，1，也就是普通的屏幕坐标系做好模型，要做四个哦。
旋转3d模型这个就比较有意思了，上面模型做好了四个，我们要组成四个面，也就是旋转Y轴，旋转X轴，但是方向是不一样的。旋转我们使用Transform就可以了。
看起来还行。
我们来做四个图片并试试。方便调试，我们带着进度条。资源
<MeshGeometry3D x:Key="Rect3D_O">
<MeshGeometry3D.Positions>
-50, 50, 0,
-50, -50, 0,
50, -50, 0,
50, 50, 0
</MeshGeometry3D.Positions>
<MeshGeometry3D.TriangleIndices>
0 1 2 2 3 0
</MeshGeometry3D.TriangleIndices>
<MeshGeometry3D.TextureCoordinates>
0,0 0,1 1,1 1,0
</MeshGeometry3D.TextureCoordinates>
<MeshGeometry3D.Normals>
0,0,1,
0,0,1,
0,0,1,
0,0,1
</MeshGeometry3D.Normals>
</MeshGeometry3D>
<DiffuseMaterial x:Key="Img">
<DiffuseMaterial.Brush>
<ImageBrush ImageSource="start.jpg" />
</DiffuseMaterial.Brush>
</DiffuseMaterial>
`
` <Viewport3D x:Name="View3D_2" >
<Viewport3D.Camera>
<PerspectiveCamera FieldOfView="{Binding ElementName=FOV, Path=Value}" Position="0,0,100" LookDirection="0,0,-1"/>
</Viewport3D.Camera>
<ModelVisual3D>
<ModelVisual3D.Content>
<Model3DGroup>
<AmbientLight Color="White"/>
<GeometryModel3D Geometry="{StaticResource Rect3D_O}" Material="{StaticResource Img}" BackMaterial="{StaticResource Img}" >
<GeometryModel3D.Transform>
<Transform3DGroup>
<RotateTransform3D CenterX="0" CenterY="1" CenterZ="0">
<RotateTransform3D.Rotation>
<AxisAngleRotation3D Angle="{Binding ElementName=Left_Top_Z, Path=Value}" Axis="0 1 0"/>
</RotateTransform3D.Rotation>
</RotateTransform3D>
<ScaleTransform3D ScaleZ="{Binding ElementName=ScaleZ_2, Path=Value}"/>
</Transform3DGroup>
</GeometryModel3D.Transform>
</GeometryModel3D>
<GeometryModel3D Geometry="{StaticResource Rect3D_O}" Material="{StaticResource Img}" BackMaterial="{StaticResource Img}" >
<GeometryModel3D.Transform>
<Transform3DGroup>
<RotateTransform3D CenterX="0" CenterY="1" CenterZ="0">
<RotateTransform3D.Rotation>
<AxisAngleRotation3D Angle="{Binding ElementName=Left_Top_Z, Path=Value}" Axis="1 0 0"/>
</RotateTransform3D.Rotation>
</RotateTransform3D>
<ScaleTransform3D ScaleZ="{Binding ElementName=ScaleZ_2, Path=Value}"/>
</Transform3DGroup>
</GeometryModel3D.Transform>
</GeometryModel3D>
<GeometryModel3D Geometry="{StaticResource Rect3D_O}" Material="{StaticResource Img}" BackMaterial="{StaticResource Img}" >
<GeometryModel3D.Transform>
<Transform3DGroup>
<RotateTransform3D CenterX="0" CenterY="1" CenterZ="0">
<RotateTransform3D.Rotation>
<AxisAngleRotation3D Angle="{Binding ElementName=Right_Bottom_Z, Path=Value}" Axis="0 1 0"/>
</RotateTransform3D.Rotation>
</RotateTransform3D>
<ScaleTransform3D ScaleZ="{Binding ElementName=ScaleZ_2, Path=Value}"/>
</Transform3DGroup>
</GeometryModel3D.Transform>
</GeometryModel3D>
<GeometryModel3D Geometry="{StaticResource Rect3D_O}" Material="{StaticResource Img}" BackMaterial="{StaticResource Img}" >
<GeometryModel3D.Transform>
<Transform3DGroup>
<RotateTransform3D CenterX="0" CenterY="1" CenterZ="0">
<RotateTransform3D.Rotation>
<AxisAngleRotation3D Angle="{Binding ElementName=Right_Bottom_Z, Path=Value}" Axis="1 0 0"/>
</RotateTransform3D.Rotation>
</RotateTransform3D>
<ScaleTransform3D ScaleZ="{Binding ElementName=ScaleZ_2, Path=Value}"/>
</Transform3DGroup>
</GeometryModel3D.Transform>
</GeometryModel3D>
</Model3DGroup>
</ModelVisual3D.Content>
</ModelVisual3D>
</Viewport3D>
<Slider Grid.Row="1" x:Name="Left_Top_Z" Minimum="-90" Value="12" Maximum="90" ToolTip="{Binding RelativeSource={RelativeSource Mode=Self}, Path=Value}"/>
<Slider Grid.Row="2" x:Name="Right_Bottom_Z" Minimum="-90" Value="-12" Maximum="0" ToolTip="{Binding RelativeSource={RelativeSource Mode=Self}, Path=Value}"/>
<Slider Grid.Row="3" x:Name="ScaleZ_2" Background="Red" Minimum="10" Maximum="100" ToolTip="{Binding RelativeSource={RelativeSource Mode=Self}, Path=Value}">
<Slider.Style >
<Style TargetType="Slider">
<Style.Triggers>
<Trigger Property="Tag" Value="1">
<Trigger.EnterActions>
<BeginStoryboard >
<Storyboard>
<DoubleAnimation RepeatBehavior="Forever" Storyboard.TargetProperty="Value" From="11" To="20" BeginTime="0:0:0" Duration="0:0:10" />
</Storyboard>
</BeginStoryboard>
</Trigger.EnterActions>
</Trigger>
</Style.Triggers>
</Style>
</Slider.Style>
</Slider>
<Slider Grid.Row="4" x:Name="FOV" Minimum="0" Maximum="180" Value="176" ToolTip="{Binding RelativeSource={RelativeSource Mode=Self}, Path=Value}"/>
运行，看看
剩下就是调试动画了。我们想要首尾衔接的动画，实际上就是要两段动画看不出首尾的区别。参考大佬们的基本思路，依靠透明度，延迟播放让首尾看不出区别。
也就是说要
这里呢，我们纯用XAML来实现这个方案。首先要解决定时问题，首先页面加载时，我们通过动画修改某个对象的某个值 ，这个对象上存在一个触发器，监控这个对象并开始定时，之后播放动画。
修改值，我们要用ObjectAnimationUsingKeyFrames动画。触发器，数值触发器，因为可以绑定。整个过程中，最重要的就是时间线，两组动画再何时出现，何时隐藏。
最终代码
<Window.Resources>
<Storyboard RepeatBehavior="Forever" Storyboard.TargetName="ScaleZ_2" Duration="0:0:10" x:Key="sb" >
<DoubleAnimation Storyboard.TargetName="ScaleZ_2" Storyboard.TargetProperty="Value" From="11" To="20" BeginTime="0:0:0" Duration="0:0:10" />
<DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="Opacity" Storyboard.TargetName="View3D_2" BeginTime="0:0:0" >
<LinearDoubleKeyFrame KeyTime="0:0:0" Value="0"/>
<LinearDoubleKeyFrame KeyTime="0:0:2" Value="1"/>
<LinearDoubleKeyFrame KeyTime="0:0:6" Value="1"/>
<LinearDoubleKeyFrame KeyTime="0:0:10" Value="0"/>
</DoubleAnimationUsingKeyFrames>
</Storyboard>
<MeshGeometry3D x:Key="Rect3D_O">
<MeshGeometry3D.Positions>
-50, 50, 0,
-50, -50, 0,
50, -50, 0,
50, 50, 0
</MeshGeometry3D.Positions>
<MeshGeometry3D.TriangleIndices>
0 1 2 2 3 0
</MeshGeometry3D.TriangleIndices>
<MeshGeometry3D.TextureCoordinates>
0,0 0,1 1,1 1,0
</MeshGeometry3D.TextureCoordinates>
<MeshGeometry3D.Normals>
0,0,1,
0,0,1,
0,0,1,
0,0,1
</MeshGeometry3D.Normals>
</MeshGeometry3D>
<DiffuseMaterial x:Key="Img">
<DiffuseMaterial.Brush>
<ImageBrush ImageSource="start.jpg" />
</DiffuseMaterial.Brush>
</DiffuseMaterial>
</Window.Resources>
<Window.Triggers>
<EventTrigger RoutedEvent="Loaded" SourceName="ScaleZ">
<BeginStoryboard>
<Storyboard Storyboard.TargetName="ScaleZ" Storyboard.TargetProperty="Tag" Duration="0:0:5.1" >
<ObjectAnimationUsingKeyFrames>
<DiscreteObjectKeyFrame KeyTime="0:0:5" >
<DiscreteObjectKeyFrame.Value>
1
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
<BeginStoryboard Storyboard="{StaticResource sb}"/>
</EventTrigger>
</Window.Triggers>
<Grid >
<Grid.RowDefinitions>
<RowDefinition/>
<RowDefinition Height="auto"/>
<RowDefinition Height="auto"/>
<RowDefinition Height="auto"/>
<RowDefinition Height="auto"/>
<RowDefinition Height="auto"/>
<RowDefinition Height="auto"/>
</Grid.RowDefinitions>
<Viewport3D x:Name="View3D_1" >
<Viewport3D.Style>
<Style TargetType="Viewport3D" >
<Style.Triggers>
<DataTrigger Binding="{Binding ElementName=ScaleZ,Path=Value}" Value="1">
<DataTrigger.EnterActions>
<BeginStoryboard >
<Storyboard>
<DoubleAnimationUsingKeyFrames RepeatBehavior="Forever" Storyboard.TargetProperty="Opacity" BeginTime="0:0:0" Duration="0:0:10">
<LinearDoubleKeyFrame KeyTime="0:0:0" Value="0"/>
<LinearDoubleKeyFrame KeyTime="0:0:5" Value="1"/>
<LinearDoubleKeyFrame KeyTime="0:0:8" Value="1"/>
<LinearDoubleKeyFrame KeyTime="0:0:10" Value="0"/>
</DoubleAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
</DataTrigger.EnterActions>
</DataTrigger>
</Style.Triggers>
</Style>
</Viewport3D.Style>
<Viewport3D.Camera>
<PerspectiveCamera FieldOfView="{Binding ElementName=FOV, Path=Value}" Position="0,0,100" LookDirection="0,0,-1"/>
</Viewport3D.Camera>
<ModelVisual3D>
<ModelVisual3D.Content>
<Model3DGroup>
<AmbientLight Color="White"/>
<GeometryModel3D Geometry="{StaticResource Rect3D_O}" Material="{StaticResource Img}" BackMaterial="{StaticResource Img}" >
<GeometryModel3D.Transform>
<Transform3DGroup>
<RotateTransform3D CenterX="0" CenterY="1" CenterZ="0">
<RotateTransform3D.Rotation>
<AxisAngleRotation3D Angle="{Binding ElementName=Left_Top_Z, Path=Value}" Axis="0 1 0"/>
</RotateTransform3D.Rotation>
</RotateTransform3D>
<ScaleTransform3D ScaleZ="{Binding ElementName=ScaleZ, Path=Value}"/>
</Transform3DGroup>
</GeometryModel3D.Transform>
</GeometryModel3D>
<GeometryModel3D Geometry="{StaticResource Rect3D_O}" Material="{StaticResource Img}" BackMaterial="{StaticResource Img}" >
<GeometryModel3D.Transform>
<Transform3DGroup>
<RotateTransform3D CenterX="0" CenterY="1" CenterZ="0">
<RotateTransform3D.Rotation>
<AxisAngleRotation3D Angle="{Binding ElementName=Left_Top_Z, Path=Value}" Axis="1 0 0"/>
</RotateTransform3D.Rotation>
</RotateTransform3D>
<ScaleTransform3D ScaleZ="{Binding ElementName=ScaleZ, Path=Value}"/>
</Transform3DGroup>
</GeometryModel3D.Transform>
</GeometryModel3D>
<GeometryModel3D Geometry="{StaticResource Rect3D_O}" Material="{StaticResource Img}" BackMaterial="{StaticResource Img}" >
<GeometryModel3D.Transform>
<Transform3DGroup>
<RotateTransform3D CenterX="0" CenterY="1" CenterZ="0">
<RotateTransform3D.Rotation>
<AxisAngleRotation3D Angle="{Binding ElementName=Right_Bottom_Z, Path=Value}" Axis="0 1 0"/>
</RotateTransform3D.Rotation>
</RotateTransform3D>
<ScaleTransform3D ScaleZ="{Binding ElementName=ScaleZ, Path=Value}"/>
</Transform3DGroup>
</GeometryModel3D.Transform>
</GeometryModel3D>
<GeometryModel3D Geometry="{StaticResource Rect3D_O}" Material="{StaticResource Img}" BackMaterial="{StaticResource&nbnbsp;Img}" >
<GeometryModel3D.Transform>
<Transform3DGroup>
<RotateTransform3D CenterX="0" CenterY="1" CenterZ="0">
<RotateTransform3D.Rotation>
<AxisAngleRotation3D Angle="{Binding ElementName=Right_Bottom_Z, Path=Value}" Axis="1 0 0"/>
</RotateTransform3D.Rotation>
</RotateTransform3D>
<ScaleTransform3D ScaleZ="{Binding ElementName=ScaleZ, Path=Value}"/>
</Transform3DGroup>
</GeometryModel3D.Transform>
</GeometryModel3D>
</Model3DGroup>
</ModelVisual3D.Content>
</ModelVisual3D>
</Viewport3D>
<Viewport3D x:Name="View3D_2" >
<Viewport3D.Camera>
<PerspectiveCamera FieldOfView="{Binding ElementName=FOV, Path=Value}" Position="0,0,100" LookDirection="0,0,-1"/>
</Viewport3D.Camera>
<ModelVisual3D>
<ModelVisual3D.Content>
<Model3DGroup>
<AmbientLight Color="White"/>
<GeometryModel3D Geometry="{StaticResource Rect3D_O}" Material="{StaticResource Img}" BackMaterial="{StaticResource Img}" >
<GeometryModel3D.Transform>
<Transform3DGroup>
<RotateTransform3D CenterX="0" CenterY="1" CenterZ="0">
<RotateTransform3D.Rotation>
<AxisAngleRotation3D Angle="{Binding ElementName=Left_Top_Z, Path=Value}" Axis="0 1 0"/>
</RotateTransform3D.Rotation>
</RotateTransform3D>
<ScaleTransform3D ScaleZ="{Binding ElementName=ScaleZ_2, Path=Value}"/>
</Transform3DGroup>
</GeometryModel3D.Transform>
</GeometryModel3D>
<GeometryModel3D Geometry="{StaticResource Rect3D_O}" Material="{StaticResource Img}" BackMaterial="{StaticResource Img}" >
<GeometryModel3D.Transform>
<Transform3DGroup>
<RotateTransform3D CenterX="0" CenterY="1" CenterZ="0">
<RotateTransform3D.Rotation>
<AxisAngleRotation3D Angle="{Binding ElementName=Left_Top_Z, Path=Value}" Axis="1 0 0"/>
</RotateTransform3D.Rotation>
</RotateTransform3D>
<ScaleTransform3D ScaleZ="{Binding ElementName=ScaleZ_2, Path=Value}"/>
</Transform3DGroup>
</GeometryModel3D.Transform>
</GeometryModel3D>
<GeometryModel3D Geometry="{StaticResource Rect3D_O}" Material="{StaticResource Img}" BackMaterial="{StaticResource Img}" >
<GeometryModel3D.Transform>
<Transform3DGroup>
<RotateTransform3D CenterX="0" CenterY="1" CenterZ="0">
<RotateTransform3D.Rotation>
<AxisAngleRotation3D Angle="{Binding ElementName=Right_Bottom_Z, Path=Value}" Axis="0 1 0"/>
</RotateTransform3D.Rotation>
</RotateTransform3D>
<ScaleTransform3D ScaleZ="{Binding ElementName=ScaleZ_2, Path=Value}"/>
</Transform3DGroup>
</GeometryModel3D.Transform>
</GeometryModel3D>
<GeometryModel3D Geometry="{StaticResource Rect3D_O}" Material="{StaticResource Img}" BackMaterial="{StaticResource Img}" >
<GeometryModel3D.Transform>
<Transform3DGroup>
<RotateTransform3D CenterX="0" CenterY="1" CenterZ="0">
<RotateTransform3D.Rotation>
<AxisAngleRotation3D Angle="{Binding ElementName=Right_Bottom_Z, Path=Value}" Axis="1 0 0"/>
</RotateTransform3D.Rotation>
</RotateTransform3D>
<ScaleTransform3D ScaleZ="{Binding ElementName=ScaleZ_2, Path=Value}"/>
</Transform3DGroup>
</GeometryModel3D.Transform>
</GeometryModel3D>
</Model3DGroup>
</ModelVisual3D.Content>
</ModelVisual3D>
</Viewport3D>
<Slider Grid.Row="1" x:Name="Left_Top_Z" Minimum="-90" Value="12" Maximum="90" ToolTip="{Binding RelativeSource={RelativeSource Mode=Self}, Path=Value}"/>
<Slider Grid.Row="2" x:Name="Right_Bottom_Z" Minimum="-90" Value="-12" Maximum="0" ToolTip="{Binding RelativeSource={RelativeSource Mode=Self}, Path=Value}"/>
<Slider Grid.Row="3" x:Name="ScaleZ" Background="Red" Minimum="10" Maximum="100" ToolTip="{Binding RelativeSource={RelativeSource Mode=Self}, Path=Value}">
<Slider.Style >
<Style TargetType="Slider">
<Style.Triggers>
<Trigger Property="Tag" Value="1">
<Trigger.EnterActions>
<BeginStoryboard >
<Storyboard>
<DoubleAnimation RepeatBehavior="Forever" Storyboard.TargetProperty="Value" From="11" To="20" BeginTime="0:0:0" Duration="0:0:10" />
</Storyboard>
</BeginStoryboard>
</Trigger.EnterActions>
</Trigger>
</Style.Triggers>
</Style>
</Slider.Style>
</Slider>
<Slider Grid.Row="4" x:Name="FOV" Minimum="0" Maximum="180" Value="176" ToolTip="{Binding RelativeSource={RelativeSource Mode=Self}, Path=Value}"/>
<Slider Grid.Row="5" x:Name="ScaleZ_2" Background="Black" Minimum="10" Maximum="100" ToolTip="{Binding RelativeSource={RelativeSource Mode=Self}, Path=Value}"/>
<StackPanel Grid.Row="6" Orientation="Vertical">
<TextBlock>
<Run Text=" View3D_1 透明度"/>
<Run Text="{Binding ElementName=View3D_1, Path=Opacity}"/>
<Run Text=" View3D_1 value"/>
<Run Text="{Binding ElementName=ScaleZ, Path=Value}"/>
<Run Text=" Tag value"/>
<Run Text="{Binding ElementName=ScaleZ, Path=Tag}"/>
<Run Text=" Zindex value"/>
<Run Text="{Binding ElementName=View3D_1, Path=(Panel.ZIndex)}"/>
</TextBlock>
<TextBlock>
<Run Text=" View3D_2 透明度"/>
<Run Text="{Binding ElementName=View3D_2, Path=Opacity}"/>
<Run Text=" View3D_2 value"/>
<Run Text="{Binding ElementName=ScaleZ_2, Path=Value}"/>
<Run Text=" Zindex value"/>
<Run Text="{Binding ElementName=View3D_2, Path=(Panel.ZIndex)}"/>
</TextBlock>
</StackPanel>
</Grid>
这样呢，我们就不用任何C#代码来完成这个效果了。
必须承认，在开头0秒时做的不是很好，略有重影，所以还有很多地方需要学习。
转自：ARM830
链接：cnblogs.com/T-ARF/p/15552980.html
- EOF -
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