WPF使用HelixToolkit加载obj格式模型

1 加载模型

HelixToolkit是一个WPF下的3D开发框架；

VS2015；先新建一个WPF项目；

从NuGet里面安装；需要安装搜出来的前2项；

 安装出现一些问题；把net版本改为4.0；HelixToolkit的最新稳定版本是23.0；

安装不了；

 看一下HelixToolkit的描述的底部有一个.NetStandard=V2.0；这个应该不是说要把net版本改为2.0；

 23.0可能是和VS2019搭配；使用一个HelixToolkit的早一些的版本，2.15.0，安装上了；

 安装前面2项；

 安装完后看一下引用；

 然后写代码；

XAML里面需要加入 xmlns:hv="http://helix-toolkit.org/wpf" ，HelixToolkit的命名空间；

然后使用 作为3D模型的显示的容器；

XAML先从网上拷一点代码来，我还没细看；

C#后端，先需要加入2个命名空间，

    using HelixToolkit.Wpf;
    using System.Windows.Media.Media3D;

加载的代码大体如下；

            string modelPath1 = "Z:\\test\\venusm.obj";
            ModelImporter import = new ModelImporter();
            var initGroup1 = import.Load(modelPath1);

            ModelVisual3D modelVisual3d1 = new ModelVisual3D();
            modelVisual3d1.Content = initGroup1;
            viewPort3D.Children.Add(modelVisual3d1);

然后运行一下，加载了一个模型；如下图；

 使用一个OBJ模型查看器，看一下原来的模型如下；

 全部的代码；

<Window x:Class="test1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:test1"
        xmlns:hv="http://helix-toolkit.org/wpf"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <hv:HelixViewport3D Name="viewPort3D" ZoomExtentsWhenLoaded="True"
                            ShowViewCube="false" ShowCoordinateSystem="True"
                            CoordinateSystemLabelForeground="White"
                            CoordinateSystemVerticalPosition="Center"
                            CoordinateSystemHorizontalPosition="Right"
                            
                            CoordinateSystemHeight="50" 
                            CoordinateSystemWidth="50"
                            
                            RenderOptions.EdgeMode="Unspecified"
                            BorderBrush="White"
                            BorderThickness="0"
                            ShowFrameRate="False"
                            ShowCameraInfo="True"
                            IsManipulationEnabled="True"
                            Background="Transparent"
                            >
            
            <hv:HelixViewport3D.DefaultCamera>
                <PerspectiveCamera LookDirection="-587.475,-330.619,-229.365" Position="587.475,330.619,256.278" UpDirection="-0.248,-0.139,0.959" FieldOfView="45" NearPlaneDistance="0.1"/>
            hv:HelixViewport3D.DefaultCamera>
            <hv:SunLight/>
 
            <hv:GridLinesVisual3D Width="1000" Length="1000" MinorDistance="50" MajorDistance="50" Thickness="1" Fill="#E5CFCECE"/>
        hv:HelixViewport3D>
 
    Grid>
Window>

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.Navigation;
using System.Windows.Shapes;
using HelixToolkit.Wpf;
using System.Windows.Media.Media3D;
 
namespace test1
{
    /// 
    /// MainWindow.xaml 的交互逻辑
    /// 
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
 
            string modelPath1 = "Z:\\test\\venusm.obj";
            ModelImporter import = new ModelImporter();
            var initGroup1 = import.Load(modelPath1);
 
            ModelVisual3D modelVisual3d1 = new ModelVisual3D();
            modelVisual3d1.Content = initGroup1;
            viewPort3D.Children.Add(modelVisual3d1);
 
        }
    }
}

下回继续；

2 HelixToolKit鼠标操作模型和场景摄像机的关系

它的模型加载以后有默认的操作；左键按下移动好像没反应，中键按下移动是拖放模型，右键按下移动是旋转和偏转模型；看一下这些操作会引起摄像机参数的什么改变；

添加元素的鼠标up事件函数和MouseWheel事件函数，并添加如下代码；

        private void HelixViewport3D_MouseRightButtonUp(object sender, MouseButtonEventArgs e)
        {
            textBox1.Text = mycame1.Position.X.ToString();
            textBox2.Text = mycame1.Position.Y.ToString();
            textBox3.Text = mycame1.Position.Z.ToString();
 
            textBox4.Text = mycame1.LookDirection.X.ToString();
            textBox5.Text = mycame1.LookDirection.Y.ToString();
            textBox6.Text = mycame1.LookDirection.Z.ToString();
 
            textBox7.Text = mycame1.FieldOfView.ToString();
        }
 
        private void HelixViewport3D_MouseUp(object sender, MouseButtonEventArgs e)
        {
            textBox1.Text = mycame1.Position.X.ToString();
            textBox2.Text = mycame1.Position.Y.ToString();
            textBox3.Text = mycame1.Position.Z.ToString();
 
            textBox4.Text = mycame1.LookDirection.X.ToString();
            textBox5.Text = mycame1.LookDirection.Y.ToString();
            textBox6.Text = mycame1.LookDirection.Z.ToString();
 
            textBox7.Text = mycame1.FieldOfView.ToString();
        }
 
        private void HelixViewport3D_MouseWheel(object sender, MouseWheelEventArgs e)
        {
            textBox1.Text = mycame1.Position.X.ToString();
            textBox2.Text = mycame1.Position.Y.ToString();
            textBox3.Text = mycame1.Position.Z.ToString();
 
            textBox4.Text = mycame1.LookDirection.X.ToString();
            textBox5.Text = mycame1.LookDirection.Y.ToString();
            textBox6.Text = mycame1.LookDirection.Z.ToString();
 
            textBox7.Text = mycame1.FieldOfView.ToString();
        }

我初步试了一下；

按下中键拖放模型会改变摄像机的Position的X和Y参数，其他参数不会影响；对比上图和下图；

 

如果按下右键移动鼠标，Position和LookDirection参数的X、Y、Z值均会受影响，有时候某个值只会在小数点几位有微小改变；

 

 

有时间继续；