下载了一个代码，加载obj模型；它的参数在xaml里，模型加载出来刚好；

然后加载另一个obj模型；加载出来之后大，偏到很高和左的位置；

它之前的摄像机位置， Position="9.9475983006414E-14,91.037123633789,414.387754871885"；

自己改为 Position="-2.0, 5.0, 1614.387754871885"，再用鼠标操作一阵，如下；

之前它是显示在整个窗口；下面把Grid分为2部分；上部作为参数调整；

 

初始参数出来的如下；

 

调一阵后如下；

 

代码如下；

<Window x:Class="Import3D.MainWindow"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:helix="http://helix-toolkit.org/wpf"Title="MainWindow" WindowState="Maximized"><Grid ShowGridLines="True"><Grid.RowDefinitions><RowDefinition Height="15*" /><RowDefinition Height="85*" /></Grid.RowDefinitions><Grid Grid.Row="1"><TextBox x:Name="textBox1" HorizontalAlignment="Left" Height="23" Text="-2.0" VerticalAlignment="Top" Width="120" IsEnabled="True" Margin="0,-66,0,0"/><TextBox x:Name="textBox2" HorizontalAlignment="Left" Height="23" Text="5.0" VerticalAlignment="Top" Width="120" IsEnabled="True" Margin="125,-58,0,0"/><TextBox x:Name="textBox3" HorizontalAlignment="Left" Height="23" Text="1614.387754871885" VerticalAlignment="Top" Width="120" IsEnabled="True" Margin="348,-50,0,0"/><Button x:Name="button" Content="Button" HorizontalAlignment="Left" VerticalAlignment="Top" Width="75" Margin="500,-50,0,0" Click="button_Click"/></Grid><Grid Grid.Row="2"><helix:HelixViewport3D ><helix:HelixViewport3D.Camera><PerspectiveCamera x:Name="mycame1"  FieldOfView="45" FarPlaneDistance="1098.9153169227836" LookDirection="0,0,-414.387754871885" NearPlaneDistance="0.1" Position="-2.0, 5.0, 1614.387754871885" UpDirection="0,1,0"/></helix:HelixViewport3D.Camera><helix:DefaultLights></helix:DefaultLights><!--<helix:FileModelVisual3D  x:Name="model1"  Source="C:\Users\Administrator\Desktop\simplexaml\simplexaml\bridgesimple712r.obj" />--><!--<helix:SphereVisual3D></helix:SphereVisual3D>--><ModelVisual3D x:Name="model"></ModelVisual3D><!--<helix:FileModelVisual3D  x:Name="model1"  Source="D:\3dmax\ez\ez.obj" />--></helix:HelixViewport3D></Grid></Grid>
</Window>

using HelixToolkit.Wpf;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Media.Media3D;
using System.Windows.Navigation;
using System.Windows.Shapes;namespace Import3D
{/// <summary>/// MainWindow.xaml 的交互逻辑/// </summary>public partial class MainWindow : Window{public MainWindow(){InitializeComponent();ObjReader CurrentHelixObjReader = new ObjReader();//Model3DGroup MyModel = CurrentHelixObjReader.Read(@".\objFile\ez.obj");//Model3DGroup MyModel = CurrentHelixObjReader.Read(@".\objFile\航天器.3ds");Model3DGroup MyModel = CurrentHelixObjReader.Read(@".\objFile\ateneal.obj"); // Model3DGroup MyModel = CurrentHelixObjReader.Read(@"C:\Users\Administrator\Desktop\simplexaml\simplexaml\bridgesimple712r.obj");// Display the modelmodel.Content = MyModel;}private void button_Click(object sender, RoutedEventArgs e){Point3D p1 = new Point3D(Double.Parse(textBox1.Text.ToString()), Double.Parse(textBox2.Text.ToString()), Double.Parse(textBox3.Text.ToString()));mycame1.Position = p1;}//Model3DGroup group = Load(@"C:\Jack_Shephard\Jack_Shephard.obj");//public static Model3DGroup Load(string path)//{//    if (path == null)//    {//        return null;//    }//    Model3DGroup model = null;//    string ext = System.IO.Path.GetExtension(path).ToLower();//    switch (ext)//    {//        case ".3ds"://            {//                var r = new HelixToolkit.Wpf.StudioReader();//                model = r.Read(path);//                break;//            }//        case ".lwo"://            {//                var r = new HelixToolkit.Wpf.LwoReader();//                model = r.Read(path);//                break;//            }//        case ".obj"://            {//                var r = new HelixToolkit.Wpf.ObjReader();//                model = r.Read(path);//                break;//            }//        case ".objz"://            {//                var r = new HelixToolkit.Wpf.ObjReader();//                model = r.ReadZ(path);//                break;//            }//        case ".stl"://            {//                var r = new HelixToolkit.Wpf.StLReader();//                model = r.Read(path);//                break;//            }//        case ".off"://            {//                var r = new HelixToolkit.Wpf.OffReader();//                model = r.Read(path);//                break;//            }//        default://            throw new InvalidOperationException("File format not supported.");//    }//    return model;//}}
}