使用WPF实现3D场景[二]
2021-07-05 07:19
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在上一篇的文章里我们知道如何构造一个简单的三维场景，这次的课程我将和大家一起来研究如何用代码，完成对建立好了的三维场景的观察。
首先看一下DEMO的界面：
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可以看到8个方向的按钮，它们将提供观察角度的变化和三维场景的旋转这样的功能。
观察位置变化：
实现原理：改变场景内照相机的绝对位置等属性
实现代码：
定义照相机
Viewport3D?Name="myViewport"?Margin="0,0,0,0">????????Viewport3D.Camera>??????????PerspectiveCamera?x:Name="myViewportCamera"?FarPlaneDistance="5000"?NearPlaneDistance="0.25"?FieldOfView="90"?Position="1800,0,0"?LookDirection="-1,0,0"?UpDirection="0,1,0">PerspectiveCamera>????????Viewport3D.Camera>
定义照相机（观察角度）的变化事件：
????????void?rightButton_Click(object?sender,?RoutedEventArgs?e)
????????...{
????????????this.myViewportCamera.Position?=?new?System.Windows.Media.Media3D.Point3D(this.myViewportCamera.Position.X,?this.myViewportCamera.Position.Y?,?this.myViewportCamera.Position.Z?+100);
????????}????????void?leftButton_Click(object?sender,?RoutedEventArgs?e)????????...{????????????this.myViewportCamera.Position?=?new?System.Windows.Media.Media3D.Point3D(this.myViewportCamera.Position.X?,?this.myViewportCamera.Position.Y,?this.myViewportCamera.Position.Z-?100);????????}????????void?backButton_Click(object?sender,?RoutedEventArgs?e)????????...{????????????this.myViewportCamera.Position?=?new?System.Windows.Media.Media3D.Point3D(this.myViewportCamera.Position.X?+?100,?this.myViewportCamera.Position.Y,?this.myViewportCamera.Position.Z?);????????}????????void?frontButton_Click(object?sender,?RoutedEventArgs?e)????????...{????????????this.myViewportCamera.Position?=?new?System.Windows.Media.Media3D.Point3D(this.myViewportCamera.Position.X?-?100,?this.myViewportCamera.Position.Y?,?this.myViewportCamera.Position.Z?);????????}
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三维场景角度变化：
实现原理：改变三维场景内定义的轴的角度
实现代码：
定义操作轴：
??????????ModelVisual3D.Transform>????????????Transform3DGroup>??????????????MatrixTransform3D/>??????????????RotateTransform3D?>????????????????RotateTransform3D.Rotation?>??????????????????AxisAngleRotation3D?Angle="0"?Axis="0,10,0"?x:Name="myAngleRotationChair"/>????????????????RotateTransform3D.Rotation>??????????????RotateTransform3D>??????????????RotateTransform3D?>????????????????RotateTransform3D.Rotation?>??????????????????AxisAngleRotation3D?Angle="0"?Axis="0,0,10"?x:Name="myAngleRotationChair_1"/>????????????????RotateTransform3D.Rotation>??????????????RotateTransform3D>????????????Transform3DGroup>??????????ModelVisual3D.Transform>????????ModelVisual3D>
定义轴旋转代码：
?void?down_Click(object?sender,?RoutedEventArgs?e)????????...{????????????this.myAngleRotationChair_1.Angle?-=?10;????????}????????void?up_Click(object?sender,?RoutedEventArgs?e)????????...{????????????this.myAngleRotationChair_1.Angle?+=?10;????????}????????void?left_Click(object?sender,?RoutedEventArgs?e)????????...{????????????this.myAngleRotationChair.Angle?-=?10;????????}????????void?right_Click(object?sender,?RoutedEventArgs?e)????????...{????????????this.myAngleRotationChair.Angle?+=?10;????????}
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好的~如果您对更多的三维场景变成想有所了解，请关注第三讲。
如果您想下载源代码或收听语音教程，请访问：微软webcast
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再次感谢您的关注，谢谢！
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