研究一段WPF 3D 机械臂代码

网上下一段代码，运行如下；显示了一个3D机械臂；
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"，这是WPF命名空间，一般写在xaml头部，它的是这样的，<Viewport3D xmlns="......；
代码的大段有：相机，变换，ModelVisual3D.Children里面有2个ModelVisual3D，第一个ModelVisual3D里面是光照，构建模型的代码在第二个ModelVisual3D里面；
看一下它使用的相机是OrthographicCamera，通常透视相机用的更多；OrthographicCamera没有近大远小的效果；
相机在屏幕之外，靠右靠上一点；往屏幕里边看，看的方向偏左偏下一点；
看一下摄像机的上方向，就是摄像机的顶部方向，UpDirection="-0.408204,0.816541,-0.408204"，Y为正，那么摄像机顶部是向上的；现在双手平端一个摄像机，两手一样高，两手距离屏幕一样远；X为负，我理解应该是把左手放低一些；X轴正向是朝右；Z为负，就是右手不动，左手往前推进一些；Z轴正向是从屏幕出来，负向是往屏幕里边去；
然后看到当前这样一个；
把上方向X值调为正，看到如下，似乎还没完全理解；
NearPlaneDistance="0.256789" FarPlaneDistance="0.770367"，这两个值应是确定一个视野范围；把范围调小一点，看到如下，裁掉一部分，因为摄像机是斜的，斜着裁掉了一部分；
对模型有一个旋转变换，
角度可以调整；
看到模型比较大，想加一个缩放变换缩小一些；在旋转变换的同一级别加入一个缩放变换，
提示出错，还不知道如何同时加入2种变换；
单独加缩放变换，缩小一些；
模型里面有数个<GeometryModel3D>，每个<GeometryModel3D>构造一个面；删除最后一个<GeometryModel3D>后如下，
删除前面的一个<GeometryModel3D>如下；
如果把前面一个面的材质颜色改一下则如下；
下回继续；还不知道它的坐标，就是<MeshGeometry3D Positions="0.400000,0.040000,0.050000 0.437401,.....，这些是如何来的，可能是某种软件导出的；
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