WPF中CAD control的XAML实现

??? 下面这个XAML文件是cad control里面最重要的一部分，使用Grid包含Viewport，Viewport中包括Camera和model。

??? 我以前和以后的关于WPF CAD的例子都是基于这个模板的，所以把这个文件单独放在一个文章里面，看其他文章遇到的话可以来查阅XAML的结构和一些Name。

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??? <Grid? x:Name="CadGrid" ClipToBounds="True">?

??????? <Viewport3D Name="ViewPort"?>
??????????? <Viewport3D.Camera>
??????????????? <OrthographicCamera x:Name="camera" Position="0,0,12" LookDirection="0,0,-1"/>
??????????? </Viewport3D.Camera>

??????????? <Viewport3D.Children>
??????????????? <ModelVisual3D>
??????????????????? <ModelVisual3D.Content>
??????????????????????? <Model3DGroup>
??????????????????????????? <AmbientLight x:Name="AmbientLight" Color="Black" />
??????????????????????????? <DirectionalLight x:Name="Headlight"? Color="White"? />
??????????????????????? </Model3DGroup>
??????????????????? </ModelVisual3D.Content>
??????????????? </ModelVisual3D>
??????????????? <ModelVisual3D x:Name="CAD3DModel" />
??????????????? <local:xyz3DAxis x:Name="Axis3D" Visibility="Hidden" Color="Red"? />
??????????? </Viewport3D.Children>
??????? </Viewport3D>

??? </Grid>