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 model
            model.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;
        //}

    }
}