//new一个loader对象            WavefrontObjLoader wfl = new WavefrontObjLoader();            //ModelVisual3DWithName是WavefrontObjLoader定义的继承ModelVisual3D的对象，直接使用ModelVisual3D也是可以的            //导入obj，第一个模型命名为m            ModelVisual3DWithName m = wfl.LoadObjFile(@"C:\Users\hasee\Desktop\WpfApplication2\WpfApplication2\Lancer_Evolution_10.obj");                      m.Content = myModel3DGroup;            //导入obj，第二个模型命名为n            var n = wfl.LoadObjFile(@"C:\Users\hasee\Desktop\WpfApplication2\WpfApplication2\精细人体.obj");            n.Content = myModel3DGroup;//将两个模型添加到场景中            vp.Children.Add(m);            vp.Children.Add(n);//vp是在xaml中定义的viewport3D

<Window x:Class="WpfApplication2.MainWindow"        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"        MouseMove="Window_MouseMove"        Title="MainWindow" Height="350" Width="525">    <Grid x:Name="lay" Background="Azure"  MouseWheel="VP_MouseWheel">        <Viewport3D x:Name="vp"                               MouseLeftButtonDown="vp_MouseLeftButtonDown" Margin="0,31,0.4,-0.2">            <Viewport3D.Camera>                <PerspectiveCamera   FieldOfView="45" FarPlaneDistance="100" LookDirection="0,0,-3.4142135623731" NearPlaneDistance="0.1" Position="0,0,3.4142135623731" UpDirection="0,1,0"/>            </Viewport3D.Camera>        </Viewport3D>     </Grid></Window>

using System;using System.Collections.Generic;using System.Linq;using System.Text;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 System.Windows.Media.Media3D;using System.Windows.Media.Animation;using System.Windows.Media.Effects;namespace WpfApplication2{    public partial class MainWindow : Window    {        //声明摄像头        PerspectiveCamera myPCamera;        //鼠标灵敏度调节        double mouseDeltaFactor = 0.4;        public MainWindow()        {            InitializeComponent();                        //摄像头            myPCamera = new PerspectiveCamera();            myPCamera.Position = new Point3D(0, 0, 200);            myPCamera.LookDirection = new Vector3D(0, 0, -1);            myPCamera.FieldOfView = 1000;            vp.Camera = myPCamera;            Model3DGroup myModel3DGroup = new Model3DGroup();            //光源            //AmbientLight （自然光）            //DirectionalLight （方向光）            //PointLight （点光源）            //SpotLight （聚光源）            DirectionalLight myDirectionalLight = new DirectionalLight();            myDirectionalLight.Color = Colors.White;            myDirectionalLight.Direction = new Vector3D(0.61, 0.5, 0.61);            myModel3DGroup.Children.Add(myDirectionalLight);            //DirectionalLight myDirectionalLight2 = new DirectionalLight();            //myDirectionalLight2.Color = Colors.White;            //myDirectionalLight2.Direction = new Vector3D(0.61, 0.5, 0.61);            //myModel3DGroup.Children.Add(myDirectionalLight2);            //new一个loader对象            WavefrontObjLoader wfl = new WavefrontObjLoader();            //ModelVisual3DWithName是WavefrontObjLoader定义的继承ModelVisual3D的对象，直接使用ModelVisual3D也是可以的            //导入obj，第一个模型命名为m            ModelVisual3DWithName m = wfl.LoadObjFile(@"C:\Users\hasee\Desktop\WpfApplication2\WpfApplication2\Lancer_Evolution_10.obj");                      m.Content = myModel3DGroup;            //导入obj，第二个模型命名为n            var n = wfl.LoadObjFile(@"C:\Users\hasee\Desktop\WpfApplication2\WpfApplication2\精细人体.obj");            n.Content = myModel3DGroup;            //下面是调整n的位置，初学者可以先注释掉。            var tt = new TranslateTransform3D();            tt.OffsetX = 110;            tt.OffsetZ = -50;            tt.OffsetY =-100;            var tr = new RotateTransform3D();                        tr.Rotation = new AxisAngleRotation3D(new Vector3D(1, 0, 0), 90);            var tr2 = new RotateTransform3D();            tr2.Rotation= new AxisAngleRotation3D(new Vector3D(0, 0, 1), -45);            var ts = new ScaleTransform3D();            ts.ScaleX = 1.5;            ts.ScaleY = 1.5;            ts.ScaleZ = 1.6;            var tg = new Transform3DGroup();            tg.Children.Add(tr); tg.Children.Add(tr2); tg.Children.Add(tt); tg.Children.Add(ts);            n.Transform = tg;            //将两个模型添加到场景中            vp.Children.Add(m);            vp.Children.Add(n);            //添加鼠标事件，用于显示隐藏光晕特效            vp.MouseEnter += Vp_MouseEnter;            vp.MouseLeave += Vp_MouseLeave;         }        private void Vp_MouseLeave(object sender, MouseEventArgs e)        {                       vp.Effect = null;        }        private void Vp_MouseEnter(object sender, MouseEventArgs e)        {            DropShadowEffect BlurRadius = new DropShadowEffect();                BlurRadius.BlurRadius = 20;                BlurRadius.Color = Colors.Yellow;                BlurRadius.Direction = 0;                BlurRadius.Opacity = 1;                BlurRadius.ShadowDepth = 0;                vp.Effect = BlurRadius;                             }        public HitTestResultBehavior HTResult(HitTestResult rawresult)        {            //MessageBox.Show(rawresult.ToString());            // RayHitTestResult rayResult = rawresult as RayHitTestResult;            RayHitTestResult rayResult = rawresult as RayHitTestResult;            if (rayResult != null)            {                //RayMeshGeometry3DHitTestResult rayMeshResult = rayResult as RayMeshGeometry3DHitTestResult;               RayHitTestResult rayMeshResultrayResult = rayResult as RayHitTestResult;                if (rayMeshResultrayResult != null)                {                    //GeometryModel3D hitgeo = rayMeshResult.ModelHit as GeometryModel3D;                    var visual3D = rawresult.VisualHit as ModelVisual3D;                    //do something                }            }            return HitTestResultBehavior.Continue;        }        //鼠标位置        Point mouseLastPosition;        private void vp_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)        {            mouseLastPosition = e.GetPosition(this);            //RayHitTestParameters hitParams = new RayHitTestParameters(myPCamera.Position, myPCamera.LookDirection);            //VisualTreeHelper.HitTest(vp.Children[0], null, ResultCallback, hitParams);            //下面是进行点击触发检测，可忽略，注释            Point3D testpoint3D = new Point3D(mouseLastPosition.X, mouseLastPosition.Y, 0);            Vector3D testdirection = new Vector3D(mouseLastPosition.X, mouseLastPosition.Y, 100);            PointHitTestParameters pointparams = new PointHitTestParameters(mouseLastPosition);            RayHitTestParameters rayparams = new RayHitTestParameters(testpoint3D, testdirection);            //test for a result in the Viewport3D            VisualTreeHelper.HitTest(vp, null, HTResult, pointparams);        }        //鼠标旋转        private void Window_MouseMove(object sender, MouseEventArgs e)        {            if (Mouse.LeftButton == MouseButtonState.Pressed)//如果按下鼠标左键            {                Point newMousePosition = e.GetPosition(this);                if (mouseLastPosition.X != newMousePosition.X)                {                    //进行水平旋转                    HorizontalTransform(mouseLastPosition.X < newMousePosition.X, mouseDeltaFactor);//水平变换                }                if (mouseLastPosition.Y != newMousePosition.Y)// change position in the horizontal direction                {                    //进行垂直旋转                    VerticalTransform(mouseLastPosition.Y > newMousePosition.Y, mouseDeltaFactor);//垂直变换                 }                mouseLastPosition = newMousePosition;            }        }        //鼠标滚轮缩放        private void VP_MouseWheel(object sender, MouseWheelEventArgs e)        {            double scaleFactor = 13;            //120 near ,   -120 far            System.Diagnostics.Debug.WriteLine(e.Delta.ToString());            Point3D currentPosition = myPCamera.Position;            Vector3D lookDirection = myPCamera.LookDirection;//new Vector3D(camera.LookDirection.X, camera.LookDirection.Y, camera.LookDirection.Z);            lookDirection.Normalize();            lookDirection *= scaleFactor;            if (e.Delta == 120)//getting near            {               //myPCamera.FieldOfView /= 1.2;                if ((currentPosition.X + lookDirection.X) * currentPosition.X > 0)                {                    currentPosition += lookDirection;                }            }            if (e.Delta == -120)//getting far            {               //myPCamera.FieldOfView *= 1.2;                currentPosition -= lookDirection;            }            Point3DAnimation positionAnimation = new Point3DAnimation();            positionAnimation.BeginTime = new TimeSpan(0, 0, 0);            positionAnimation.Duration = TimeSpan.FromMilliseconds(100);            positionAnimation.To = currentPosition;            positionAnimation.From = myPCamera.Position;            positionAnimation.Completed += new EventHandler(positionAnimation_Completed);            myPCamera.BeginAnimation(PerspectiveCamera.PositionProperty, positionAnimation, HandoffBehavior.Compose);        }        void positionAnimation_Completed(object sender, EventArgs e)        {            Point3D position = myPCamera.Position;            myPCamera.BeginAnimation(PerspectiveCamera.PositionProperty, null);            myPCamera.Position = position;        }        // 垂直变换        private void VerticalTransform(bool upDown, double angleDeltaFactor)        {            Vector3D postion = new Vector3D(myPCamera.Position.X, myPCamera.Position.Y, myPCamera.Position.Z);            Vector3D rotateAxis = Vector3D.CrossProduct(postion, myPCamera.UpDirection);            RotateTransform3D rt3d = new RotateTransform3D();            AxisAngleRotation3D rotate = new AxisAngleRotation3D(rotateAxis, angleDeltaFactor * (upDown ? 1 : -1));            rt3d.Rotation = rotate;            Matrix3D matrix = rt3d.Value;            Point3D newPostition = matrix.Transform(myPCamera.Position);            myPCamera.Position = newPostition;            myPCamera.LookDirection = new Vector3D(-newPostition.X, -newPostition.Y, -newPostition.Z);            //update the up direction            Vector3D newUpDirection = Vector3D.CrossProduct(myPCamera.LookDirection, rotateAxis);            newUpDirection.Normalize();            myPCamera.UpDirection = newUpDirection;        }       // 水平变换：private void HorizontalTransform(bool leftRight, double angleDeltaFactor)        {            Vector3D postion = new Vector3D(myPCamera.Position.X, myPCamera.Position.Y, myPCamera.Position.Z);            Vector3D rotateAxis = myPCamera.UpDirection;            RotateTransform3D rt3d = new RotateTransform3D();            AxisAngleRotation3D rotate = new AxisAngleRotation3D(rotateAxis, angleDeltaFactor * (leftRight ? 1 : -1));            rt3d.Rotation = rotate;            Matrix3D matrix = rt3d.Value;            Point3D newPostition = matrix.Transform(myPCamera.Position);            myPCamera.Position = newPostition;            myPCamera.LookDirection = new Vector3D(-newPostition.X, -newPostition.Y, -newPostition.Z);        }    }}