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，
<RotateTransform3D>
<RotateTransform3D.Rotation>
<AxisAngleRotation3D Angle="30" Axis="0,1,0"/>
</RotateTransform3D.Rotation>
</RotateTransform3D>
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，
<ScaleTransform3D CenterX="0" CenterY="0" CenterZ="0" ScaleX="0.6" ScaleY="0.6" ScaleZ="0.6">
</ScaleTransform3D>
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；
文章来源：https://www.toymoban.com/news/detail-407688.html
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；文章来源地址https://www.toymoban.com/news/detail-407688.html
<Page
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Grid>
<Viewport3D xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Viewport3D.Camera>
<OrthographicCamera Position="0.491531,0.298732,0.321531" LookDirection="-0.577382,-0.577288,-0.777382" UpDirection="-0.408204,0.816541,-0.408204" NearPlaneDistance="0.256789" FarPlaneDistance="0.770367" Width="0.513578"/>
</Viewport3D.Camera>
<Viewport3D.Children>
<ModelVisual3D>
<ModelVisual3D.Transform>
<RotateTransform3D>
<RotateTransform3D.Rotation>
<AxisAngleRotation3D Angle="15" Axis="0,1,0"/>
</RotateTransform3D.Rotation>
</RotateTransform3D>
</ModelVisual3D.Transform>
<ModelVisual3D.Children>
<ModelVisual3D>
<ModelVisual3D.Content>
<Model3DGroup>
<Model3DGroup.Children>
<AmbientLight Color="#262626"/>
<DirectionalLight Color="#6F6F6F" Direction="3.150000,-8.090000,-4.960000"/>
<DirectionalLight Color="#454545" Direction="8.610000,4.820000,-1.640000"/>
<DirectionalLight Color="#332835" Direction="-9.490000,3.090000,0.600000"/>
</Model3DGroup.Children>
</Model3DGroup>
</ModelVisual3D.Content>
</ModelVisual3D>
<ModelVisual3D>
<ModelVisual3D.Transform>
<MatrixTransform3D Matrix="1.000000 0.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 0.000000 1.000000 "/>
</ModelVisual3D.Transform>
<ModelVisual3D.Content>
<Model3DGroup>
<Model3DGroup.Children>
<GeometryModel3D>
<GeometryModel3D.Material>
<MaterialGroup>
<DiffuseMaterial>
<DiffuseMaterial.Brush>
<SolidColorBrush Color="#CCCC99" Opacity="1.000000"/>
</DiffuseMaterial.Brush>
</DiffuseMaterial>
<SpecularMaterial SpecularPower="1.000000">
<SpecularMaterial.Brush>
<SolidColorBrush Color="#FFFFC0" Opacity="1.000000"/>
</SpecularMaterial.Brush>
</SpecularMaterial>
<EmissiveMaterial>
<EmissiveMaterial.Brush>
<SolidColorBrush Color="#191913" Opacity="1.000000"/>
</EmissiveMaterial.Brush>
</EmissiveMaterial>
</MaterialGroup>
</GeometryModel3D.Material>
<GeometryModel3D.Geometry>
<MeshGeometry3D Positions="0.400000,0.040000,0.050000 0.437401,-0.014184,0.050000 0.439708,-0.004821,0.050000 0.400000,0.040000,0.050000 0.000000,0.050000,0.050000 0.000000,-0.050000,0.050000 -0.010396,0.048907,0.050000 -0.020337,0.045677,0.050000 0.000000,-0.050000,0.050000 0.400000,-0.040000,0.050000 0.400000,0.040000,0.050000 0.409573,-0.038838,0.050000 0.418589,-0.035418,0.050000 0.418589,0.035418,0.050000 0.437401,0.014184,0.050000 0.426525,0.029940,0.050000 0.432919,0.022723,0.050000 0.439708,-0.004821,0.050000 0.439708,0.004821,0.050000 0.400000,0.040000,0.050000 0.437401,0.014184,0.050000 0.409573,0.038838,0.050000 0.418589,0.035418,0.050000 0.418589,-0.035418,0.050000 0.426525,-0.029940,0.050000 0.400000,0.040000,0.050000 0.432919,-0.022723,0.050000 0.437401,-0.014184,0.050000 -0.020337,0.045677,0.050000 -0.029389,0.040451,0.050000 0.000000,-0.050000,0.050000 -0.037157,0.033457,0.050000 -0.043301,0.025000,0.050000 -0.029389,-0.040451,0.050000 -0.043301,0.025000,0.050000 -0.047553,0.015451,0.050000 -0.029389,-0.040451,0.050000 -0.020337,-0.045677,0.050000 -0.043301,0.025000,0.050000 -0.010396,-0.048907,0.050000 0.000000,-0.050000,0.050000 -0.049726,-0.005226,0.050000 -0.047553,-0.015451,0.050000 -0.043301,-0.025000,0.050000 -0.047553,0.015451,0.050000 -0.049726,0.005226,0.050000 -0.029389,-0.040451,0.050000 -0.049726,-0.005226,0.050000 -0.037157,-0.033457,0.050000 -0.043301,-0.025000,0.050000 " Normals="0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 0.000000,0.000000,1.000000 " TriangleIndices="0,1,2 3,4,5 6,5,4 5,6,7 8,9,10 11,10,9 10,11,12 13,14,15 16,15,14 17,18,19 20,19,18 19,20,21 22,21,20 23,24,25 26,25,24 25,26,27 28,29,30 31,30,29 30,31,32 33,34,35 36,37,38 39,38,37 38,39,40 41,42,43 44,45,46 47,46,45 46,47,48 49,48,47 "/>
</GeometryModel3D.Geometry>
</GeometryModel3D>
<GeometryModel3D>
<GeometryModel3D.Material>
<MaterialGroup>
<DiffuseMaterial>
<DiffuseMaterial.Brush>
<SolidColorBrush Color="#CCCC99" Opacity="1.000000"/>
</DiffuseMaterial.Brush>
</DiffuseMaterial>
<SpecularMaterial SpecularPower="1.000000">
<SpecularMaterial.Brush>
<SolidColorBrush Color="#FFFFC0" Opacity="1.000000"/>
</SpecularMaterial.Brush>
</SpecularMaterial>
<EmissiveMaterial>
<EmissiveMaterial.Brush>
<SolidColorBrush Color="#191913" Opacity="1.000000"/>
</EmissiveMaterial.Brush>
</EmissiveMaterial>
</MaterialGroup>
</GeometryModel3D.Material>
<GeometryModel3D.Geometry>
<MeshGeometry3D Positions="0.409573,-0.038838,0.000000 0.400000,-0.040000,0.000000 0.400000,0.040000,0.000000 0.400000,0.040000,0.000000 0.400000,-0.040000,0.000000 0.000000,0.050000,0.000000 0.000000,-0.050000,0.000000 -0.010396,-0.048907,0.000000 0.439708,-0.004821,0.000000 0.437401,-0.014184,0.000000 0.400000,0.040000,0.000000 0.432919,-0.022723,0.000000 0.409573,0.038838,0.000000 0.418589,0.035418,0.000000 0.437401,0.014184,0.000000 0.426525,0.029940,0.000000 0.432919,0.022723,0.000000 0.409573,0.038838,0.000000 0.437401,0.014184,0.000000 0.400000,0.040000,0.000000 0.439708,0.004821,0.000000 0.439708,-0.004821,0.000000 -0.029389,0.040451,0.000000 -0.020337,0.045677,0.000000 -0.029389,-0.040451,0.000000 0.432919,-0.022723,0.000000 0.426525,-0.029940,0.000000 0.400000,0.040000,0.000000 0.418589,-0.035418,0.000000 0.409573,-0.038838,0.000000 -0.043301,0.025000,0.000000 -0.037157,-0.033457,0.000000 -0.043301,-0.025000,0.000000 -0.010396,-0.048907,0.000000 -0.020337,-0.045677,0.000000 0.000000,0.050000,0.000000 -0.029389,-0.040451,0.000000 -0.010396,0.048907,0.000000 -0.020337,0.045677,0.000000 -0.037157,-0.033457,0.000000 -0.043301,0.025000,0.000000 -0.029389,-0.040451,0.000000 -0.037157,0.033457,0.000000 -0.029389,0.040451,0.000000 -0.043301,-0.025000,0.000000 -0.047553,-0.015451,0.000000 -0.043301,0.025000,0.000000 -0.049726,-0.005226,0.000000 -0.047553,0.015451,0.000000 -0.049726,0.005226,0.000000 " Normals="0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 0.000000,0.000000,-1.000000 " TriangleIndices="0,1,2 3,4,5 6,5,4 5,6,7 8,9,10 11,10,9 12,13,14 15,14,13 14,15,16 17,18,19 20,19,18 19,20,21 22,23,24 25,26,27 28,27,26 27,28,29 30,31,32 33,34,35 36,35,34 35,36,37 38,37,36 39,40,41 42,41,40 41,42,43 44,45,46 47,46,45 46,47,48 49,48,47 "/>
</GeometryModel3D.Geometry>
</GeometryModel3D>
<GeometryModel3D>
<GeometryModel3D.Material>
<MaterialGroup>
<DiffuseMaterial>
<DiffuseMaterial.Brush>
<SolidColorBrush Color="#CCCC99" Opacity="1.000000"/>
</DiffuseMaterial.Brush>
</DiffuseMaterial>
<SpecularMaterial SpecularPower="1.000000">
<SpecularMaterial.Brush>
<SolidColorBrush Color="#FFFFC0" Opacity="1.000000"/>
</SpecularMaterial.Brush>
</SpecularMaterial>
<EmissiveMaterial>
<EmissiveMaterial.Brush>
<SolidColorBrush Color="#191913" Opacity="1.000000"/>
</EmissiveMaterial.Brush>
</EmissiveMaterial>
</MaterialGroup>
</GeometryModel3D.Material>
<GeometryModel3D.Geometry>
<MeshGeometry3D Positions="0.400000,0.040000,0.000000 -0.000000,0.050000,0.000000 0.400000,0.040000,0.010000 -0.000000,0.050000,0.050000 0.400000,0.040000,0.040000 0.400000,0.040000,0.050000 " Normals="0.024992,0.999688,0.000000 0.024992,0.999688,0.000000 0.024992,0.999688,0.000000 0.024992,0.999688,0.000000 0.024992,0.999688,0.000000 0.024992,0.999688,0.000000 " TriangleIndices="0,1,2 3,2,1 2,3,4 5,4,3 "/>
</GeometryModel3D.Geometry>
</GeometryModel3D>
<GeometryModel3D>
<GeometryModel3D.Material>
<MaterialGroup>
<DiffuseMaterial>
<DiffuseMaterial.Brush>
<SolidColorBrush Color="#CCCC99" Opacity="1.000000"/>
</DiffuseMaterial.Brush>
</DiffuseMaterial>
<SpecularMaterial SpecularPower="1.000000">
<SpecularMaterial.Brush>
<SolidColorBrush Color="#FFFFC0" Opacity="1.000000"/>
</SpecularMaterial.Brush>
</SpecularMaterial>
<EmissiveMaterial>
<EmissiveMaterial.Brush>
<SolidColorBrush Color="#191913" Opacity="1.000000"/>
</EmissiveMaterial.Brush>
</EmissiveMaterial>
</MaterialGroup>
</GeometryModel3D.Material>
<GeometryModel3D.Geometry>
<MeshGeometry3D Positions="0.400000,-0.040000,0.050000 0.400000,-0.040000,0.040000 0.409573,-0.038838,0.040000 0.400000,-0.040000,0.050000 0.409573,-0.038838,0.040000 0.409573,-0.038838,0.050000 0.418589,-0.035418,0.040000 0.418589,-0.035418,0.050000 0.426525,-0.029940,0.040000 0.426525,-0.029940,0.050000 0.432919,-0.022723,0.040000 0.432919,-0.022723,0.050000 0.437401,-0.014184,0.040000 0.437401,-0.014184,0.050000 0.439708,-0.004821,0.040000 0.439708,-0.004821,0.050000 0.439708,0.004821,0.040000 0.439708,0.004821,0.050000 0.437401,0.014184,0.040000 0.437401,0.014184,0.050000 0.432919,0.022723,0.040000 0.432919,0.022723,0.050000 0.426525,0.029940,0.040000 0.426525,0.029940,0.050000 0.418589,0.035418,0.040000 0.418589,0.035418,0.050000 0.409573,0.038838,0.040000 0.409573,0.038838,0.050000 0.400000,0.040000,0.040000 0.400000,0.040000,0.050000 " Normals="0.000000,-1.000000,0.000000 0.000000,-1.000000,0.000000 0.239316,-0.970942,0.000000 0.000000,-1.000000,0.000000 0.239316,-0.970942,0.000000 0.239316,-0.970942,0.000000 0.464723,-0.885456,0.000000 0.464723,-0.885456,0.000000 0.663123,-0.748511,0.000000 0.663123,-0.748511,0.000000 0.822984,-0.568065,0.000000 0.822984,-0.568065,0.000000 0.935016,-0.354605,0.000000 0.935016,-0.354605,0.000000 0.992709,-0.120537,0.000000 0.992709,-0.120537,0.000000 0.992709,0.120537,0.000000 0.992709,0.120537,0.000000 0.935016,0.354605,0.000000 0.935016,0.354605,0.000000 0.822984,0.568065,0.000000 0.822984,0.568065,0.000000 0.663123,0.748511,0.000000 0.663123,0.748511,0.000000 0.464723,0.885456,0.000000 0.464723,0.885456,0.000000 0.239316,0.970942,0.000000 0.239316,0.970942,0.000000 -0.000000,1.000000,0.000000 -0.000000,1.000000,0.000000 " TriangleIndices="0,1,2 3,4,5 6,5,4 5,6,7 8,7,6 7,8,9 10,9,8 9,10,11 12,11,10 11,12,13 14,13,12 13,14,15 16,15,14 15,16,17 18,17,16 17,18,19 20,19,18 19,20,21 22,21,20 21,22,23 24,23,22 23,24,25 26,25,24 25,26,27 28,27,26 27,28,29 "/>
</GeometryModel3D.Geometry>
</GeometryModel3D>
<GeometryModel3D>
<GeometryModel3D.Material>
<MaterialGroup>
<DiffuseMaterial>
<DiffuseMaterial.Brush>
<SolidColorBrush Color="#CCCC99" Opacity="1.000000"/>
</DiffuseMaterial.Brush>
</DiffuseMaterial>
<SpecularMaterial SpecularPower="1.000000">
<SpecularMaterial.Brush>
<SolidColorBrush Color="#FFFFC0" Opacity="1.000000"/>
</SpecularMaterial.Brush>
</SpecularMaterial>
<EmissiveMaterial>
<EmissiveMaterial.Brush>
<SolidColorBrush Color="#191913" Opacity="1.000000"/>
</EmissiveMaterial.Brush>
</EmissiveMaterial>
</MaterialGroup>
</GeometryModel3D.Material>
<GeometryModel3D.Geometry>
<MeshGeometry3D Positions="-0.000000,0.050000,0.050000 -0.000000,0.050000,0.000000 -0.010396,0.048907,0.000000 -0.000000,0.050000,0.050000 -0.010396,0.048907,0.000000 -0.010396,0.048907,0.050000 -0.020337,0.045677,0.000000 -0.020337,0.045677,0.050000 -0.029389,0.040451,0.000000 -0.029389,0.040451,0.050000 -0.037157,0.033457,0.000000 -0.037157,0.033457,0.050000 -0.043301,0.025000,0.000000 -0.043301,0.025000,0.050000 -0.047553,0.015451,0.000000 -0.047553,0.015451,0.050000 -0.049726,0.005226,0.000000 -0.049726,0.005226,0.050000 -0.049726,-0.005226,0.000000 -0.049726,-0.005226,0.050000 -0.047553,-0.015451,0.000000 -0.047553,-0.015451,0.050000 -0.043301,-0.025000,0.000000 -0.043301,-0.025000,0.050000 -0.037157,-0.033457,0.000000 -0.037157,-0.033457,0.050000 -0.029389,-0.040451,0.000000 -0.029389,-0.040451,0.050000 -0.020337,-0.045677,0.000000 -0.020337,-0.045677,0.050000 -0.010396,-0.048907,0.000000 -0.010396,-0.048907,0.050000 0.000000,-0.050000,0.000000 0.000000,-0.050000,0.050000 " Normals="-0.000000,1.000000,0.000000 -0.000000,1.000000,0.000000 -0.207912,0.978148,0.000000 -0.000000,1.000000,0.000000 -0.207912,0.978148,0.000000 -0.207912,0.978148,0.000000 -0.406737,0.913545,0.000000 -0.406737,0.913545,0.000000 -0.587785,0.809017,0.000000 -0.587785,0.809017,0.000000 -0.743145,0.669131,0.000000 -0.743145,0.669131,0.000000 -0.866025,0.500000,0.000000 -0.866025,0.500000,0.000000 -0.951057,0.309017,0.000000 -0.951057,0.309017,0.000000 -0.994522,0.104528,0.000000 -0.994522,0.104528,0.000000 -0.994522,-0.104528,0.000000 -0.994522,-0.104528,0.000000 -0.951057,-0.309017,0.000000 -0.951057,-0.309017,0.000000 -0.866025,-0.500000,0.000000 -0.866025,-0.500000,0.000000 -0.743145,-0.669131,0.000000 -0.743145,-0.669131,0.000000 -0.587785,-0.809017,0.000000 -0.587785,-0.809017,0.000000 -0.406737,-0.913545,0.000000 -0.406737,-0.913545,0.000000 -0.207912,-0.978148,0.000000 -0.207912,-0.978148,0.000000 0.000000,-1.000000,0.000000 0.000000,-1.000000,0.000000 " TriangleIndices="0,1,2 3,4,5 6,5,4 5,6,7 8,7,6 7,8,9 10,9,8 9,10,11 12,11,10 11,12,13 14,13,12 13,14,15 16,15,14 15,16,17 18,17,16 17,18,19 20,19,18 19,20,21 22,21,20 21,22,23 24,23,22 23,24,25 26,25,24 25,26,27 28,27,26 27,28,29 30,29,28 29,30,31 32,31,30 31,32,33 "/>
</GeometryModel3D.Geometry>
</GeometryModel3D>
<GeometryModel3D>
<GeometryModel3D.Material>
<MaterialGroup>
<DiffuseMaterial>
<DiffuseMaterial.Brush>
<SolidColorBrush Color="#CCCC99" Opacity="1.000000"/>
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