调用ToXnaMatrix函数需要安装哪个库
Error4'System.Windows.Media.Media3D.Matrix3D' does not contain a definition for 'ToXnaMatrix' and no extension method 'ToXnaMatrix' accepting a first argument of type 'System.Windows.Media.Media3D.Matrix3D' could be found (are you missing a using directive or an assembly reference?)
[解决办法]
木有听过这函数~
