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[osg][osgEarth][原]基于OE自定义自由飞行漫游器（初级版）
阅读量：6287 次
发布时间：2019-06-22

本文共 14211 字，大约阅读时间需要 47 分钟。

由于受够了OE的漫游器，想搞个可以在全球飞行的漫游器，所以就做了一个：

请无视我的起名规则······

类头文件：EarthWalkManipulator.h

#pragma once//南水之源  20180101#include 
     
      #include 
      
       #include 
       
        #include 
        
         class EarthWalkManipulator :public osgGA::CameraManipulator{public:    EarthWalkManipulator();    ~EarthWalkManipulator();    //所有漫游器都必须实现的4个纯虚函数      virtual void setByMatrix(const osg::Matrixd& matrix) {}  //设置相机的位置姿态矩阵      virtual void setByInverseMatrix(const osg::Matrixd& matrix) {}  //设置相机的视图矩阵      virtual osg::Matrixd getMatrix() const;  //获取相机的姿态矩阵     virtual osg::Matrixd getInverseMatrix() const;   //获取相机的视图矩阵     //所有操作在这里响应    virtual bool handle(const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter& us);    // Attach a node to the manipulator.    virtual void setNode(osg::Node*);    virtual osg::Node* getNode();    bool established();    /**    * Sets the camera position, optionally moving it there over time.    */    //virtual void setViewpoint(const osgEarth::Viewpoint& vp, double duration_s = 0.0);    virtual void home(double /*unused*/);    virtual void home(const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter& us);    void addMouseEvent(const osgGA::GUIEventAdapter& ea);    bool calcMovement(const osgGA::GUIEventAdapter& ea);protected:    osg::Vec3   _eye;               //视点位置      osg::Quat    _rotate;            //旋转姿态     osg::ref_ptr
         
            _root;    osg::observer_ptr
          
            _node; osg::observer_ptr
           
             _mapNode; osg::ref_ptr
            
              _srs; float _speed; //速度 // Internal event stack comprising last two mouse events. osg::ref_ptr
             
               _ga_t1; osg::ref_ptr
              
                _ga_t0;};

类实现：EarthWalkManipulator.cpp

//南水之源  20180101#include "EarthWalkManipulator.h"#include 
     
      #include 
      
       #include 
       
        using namespace osgEarth;EarthWalkManipulator::EarthWalkManipulator(){    _eye = osg::Vec3d(0, 0, 0);    //_rotate = osg::Quat(-osg::PI_2, osg::X_AXIS);    _speed = 1.0;}EarthWalkManipulator::~EarthWalkManipulator(){}//获取相机的姿态矩阵 osg::Matrixd EarthWalkManipulator::getMatrix() const{    osg::Matrix mat;    mat.setRotate(_rotate);//先旋转    mat.postMultTranslate(_eye);//再平移    return mat;}osg::Matrixd EarthWalkManipulator::getInverseMatrix() const{    osg::Matrix mat;    mat.setRotate(-_rotate);    mat.preMultTranslate(-_eye);    return mat;    //return osg::Matrixd::inverse(getMatrix());}voidEarthWalkManipulator::home(double unused){    _eye = osg::Vec3d(0, 0, 0);    _speed = 1.0;}voidEarthWalkManipulator::home(const osgGA::GUIEventAdapter&, osgGA::GUIActionAdapter& us){    home(0.0);    us.requestRedraw();}voidEarthWalkManipulator::setNode(osg::Node* node){    // you can only set the node if it has not already been set, OR if you are setting    // it to NULL. (So to change it, you must first set it to NULL.) This is to prevent    // OSG from overwriting the node after you have already set on manually.    if (node == 0L || !_node.valid())    {        _root = node;        _node = node;        _mapNode = 0L;        _srs = 0L;        established();        osg::Matrix matrixGood1;        GeoPoint point1(_srs, 0, 0, 10000.0);        point1.createLocalToWorld(matrixGood1);        _eye = matrixGood1.getTrans();        osg::Vec3d worldup;        point1.createWorldUpVector(worldup);        osg::Matrix mat;        matrixGood1.getRotate().get(mat);        osg::Vec3d eye, center, up;        mat.getLookAt(eye, center, up);        mat.makeLookAt(eye, -worldup, up);        _rotate = mat.getRotate();    }}osg::Node*EarthWalkManipulator::getNode(){    return _node.get();}bool EarthWalkManipulator::handle(const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter& us){    switch (ea.getEventType())    {    case(osgGA::GUIEventAdapter::FRAME):    {        if (calcMovement(ea))//根据鼠标在屏幕中的位置调整相机转向            us.requestRedraw();        return true;    }break;    case(osgGA::GUIEventAdapter::SCROLL):    {        osg::Quat qat;        osg::Matrix mat;        _rotate.get(mat);        osg::Vec3d eye, center, up;        mat.getLookAt(eye, center, up);        osg::Vec3d dirction = center - eye;        dirction.normalize();        up.normalize();        osg::Vec3d cross = dirction^up;        cross.normalize();        cross *= 0.01;        switch (ea.getScrollingMotion())        {        case osgGA::GUIEventAdapter::ScrollingMotion::SCROLL_UP://逆时针旋转相机        {            mat = osg::Matrix::lookAt(eye, center, up + cross);            _rotate = mat.getRotate();        }break;        case osgGA::GUIEventAdapter::ScrollingMotion::SCROLL_DOWN://顺时针旋转相机        {            mat = osg::Matrix::lookAt(eye, center, up - cross);            _rotate = mat.getRotate();        }break;        }        return true;    }break;    case (osgGA::GUIEventAdapter::KEYDOWN):    {        osg::Vec3   v3Direction;         //视点方向          osg::Matrix mCameraQuat;        osg::Vec3d  v3Eye, v3Center, v3Up;        _rotate.get(mCameraQuat);        mCameraQuat.getLookAt(v3Eye, v3Center, v3Up);//这里的v3Eye不是实际相机的位置，而是0，0，0        v3Direction = v3Center - v3Eye;        v3Direction.normalize();        osg::Vec3d v3CrossVector = v3Up^v3Direction;        v3CrossVector.normalize();        if (ea.getKey() == 'w' || ea.getKey() == 'W' || ea.getKey() == osgGA::GUIEventAdapter::KEY_Up)//前进        {            _eye += v3Direction * _speed;        }        if (ea.getKey() == 's' || ea.getKey() == 'S' || ea.getKey() == osgGA::GUIEventAdapter::KEY_Down)//后退        {            _eye -= v3Direction * _speed;        }        if (ea.getKey() == 'a' || ea.getKey() == 'A' || ea.getKey() == osgGA::GUIEventAdapter::KEY_Left)//左移        {            _eye += v3CrossVector * _speed;        }        if (ea.getKey() == 'd' || ea.getKey() == 'D' || ea.getKey() == osgGA::GUIEventAdapter::KEY_Right)//右移        {            _eye -= v3CrossVector * _speed;        }        if (ea.getKey() == '-' || ea.getKey() == '_' || ea.getKey() == osgGA::GUIEventAdapter::KEY_Control_L)//减10倍移动速度        {            _speed /= 10.0;            if (_speed < 1.0)            {                _speed = 1.0;            }        }        if (ea.getKey() == '=' || ea.getKey() == '+' || ea.getKey() == osgGA::GUIEventAdapter::KEY_Shift_L)//加10倍移动速度        {            _speed *= 10.0;            if (_speed > 100000.0)            {                _speed = 100000.0;            }        }        if (ea.getKey() == 'h' || ea.getKey() == 'H')//在当前经纬度，姿态回正：1.视点向地面 2.头部向正北        {            v3Eye = _eye;//使用相机实际位置            osg::Vec3d v3EyeLonLat;            _srs->transformFromWorld(v3Eye, v3EyeLonLat);            //先获取当前位置的经纬度，再获取当前正上，正北            osg::Matrix mRealAttitude;            if (v3EyeLonLat.z() < 0)//v3EyeLonLat.z()是眼点实际海拔                v3EyeLonLat.z() = 100;//将海拔0以下的物体拉到海拔100米            GeoPoint gEyeGeo(_srs, v3EyeLonLat.x(), v3EyeLonLat.y(), v3EyeLonLat.z());            gEyeGeo.createLocalToWorld(mRealAttitude);            osg::Vec3d v3HorizonUp;//指天向量            gEyeGeo.createWorldUpVector(v3HorizonUp);                        _eye = mRealAttitude.getTrans();            mRealAttitude.getLookAt(v3Eye, v3Center, v3Up);//获取新的位置和姿态            osg::Matrix mDeviationAttitude;//向北位置偏移0.00001纬度，为了计算正北方向            GeoPoint gDeviationEyeGeo(_srs, v3EyeLonLat.x(), v3EyeLonLat.y() + 0.00001, v3EyeLonLat.z());            gDeviationEyeGeo.createLocalToWorld(mDeviationAttitude);            osg::Vec3d v3DeviationNorthPoint = mDeviationAttitude.getTrans();            osg::Vec3d v3NorthHeadUp = v3DeviationNorthPoint - v3Eye;            v3NorthHeadUp.normalize();//指北向量            //if (v3EyeLonLat.y() < 90.0 && v3EyeLonLat.y() > 0.0)//没研究出为什么北半球和南半球需要相反，但实际使用没问题            //{            //    mRealAttitude.makeLookAt(osg::Vec3d(0,0,0), -v3HorizonUp, -v3NorthHeadUp);            //}            if (v3EyeLonLat.y() < 89.99999  && v3EyeLonLat.y() > -90.0)            {                mRealAttitude.makeLookAt(osg::Vec3d(0, 0, 0), -v3HorizonUp, v3NorthHeadUp);            }            _rotate = mRealAttitude.getRotate();        }    }break;    default:        return false;    }}boolEarthWalkManipulator::established(){    if (_srs.valid() && _mapNode.valid() && _node.valid())        return true;    // lock down the observed node:    osg::ref_ptr
        
          safeNode;    if (!_node.lock(safeNode))        return false;    // find a map node or fail:    _mapNode = osgEarth::MapNode::findMapNode(safeNode.get());    if (!_mapNode.valid())        return false;    // Cache the SRS.    _srs = _mapNode->getMapSRS();    return true;}void EarthWalkManipulator::addMouseEvent(const osgGA::GUIEventAdapter& ea){    _ga_t1 = _ga_t0;    _ga_t0 = &ea;}bool EarthWalkManipulator::calcMovement(const osgGA::GUIEventAdapter& ea){    osg::Quat qat;    osg::Matrix mat;    _rotate.get(mat);    osg::Vec3d eye, center, up;    mat.getLookAt(eye, center, up);    osg::Vec3d dirction = center - eye;    dirction.normalize();    up.normalize();    osg::Vec3d cross = dirction^up;    cross.normalize();    double x1 = ea.getXnormalized();    double y1 = ea.getYnormalized();    osg::Vec3d deviation(0, 0, 0);    if (x1 > 0.1)    {        deviation += cross * 0.001;    }    else if (x1 < -0.1)    {        deviation -= cross * 0.001;    }    if (y1 > 0.1)    {        deviation += up * 0.001;    }    else if (y1 < -0.1)    {        deviation -= up * 0.001;    }    mat = osg::Matrix::lookAt(eye, deviation + center, up);    _rotate = mat.getRotate();    return true;}

使用：main.cpp

#include 
     
      #include 
      
       #include 
       
        #include 
        
         #include 
         
          #include 
          
           #include 
           
            #include 
            
             #include 
             
              #include 
              
               #include 
               
                #include 
                
                 #include 
                 
                  #include 
                  
                   #include 
                   
                    #include 
                    
                     #include 
                     
                      #include 
                      
                       #include 
                       
                        #include 
                        
                         #include 
                         
                          #include 
                          
                           #include 
                           
                            #include 
                            
                             #include 
                             
                              #include "EarthWalkManipulator.h"using namespace osgEarth;using namespace osgEarth::Util;using namespace osgEarth::Symbology;int main(int argc, char** argv){ //正常的.earth文件加载 osg::ArgumentParser arguments(&argc, argv); osgViewer::Viewer viewer; MapNode* s_mapNode = 0L; osg::Node* earthFile = MapNodeHelper().load(arguments, &viewer); if (earthFile) s_mapNode = MapNode::get(earthFile); if (!s_mapNode) { OE_WARN << "Unable to load earth file." << std::endl; return -1; } osg::Group* root = new osg::Group(); root->addChild(earthFile); osg::Matrix matrixGood1; osg::Vec3d geopoint1, geopoint2, geopoint3; GeoPoint point1(s_mapNode->getMapSRS(), 0, 0, 1000); point1.createLocalToWorld(matrixGood1); //matrixGood1.getLookAt(geopoint1, geopoint2, geopoint3); //osg::Vec3 _vector = geopoint1 - geopoint2; //添加一头牛，查看位置是否正确 //osg::Node* cow = osgDB::readNodeFile("D:\\temp\\node\\cow.osg"); // //osg::ref_ptr
                              
                                pat = new osg::MatrixTransform; //pat->addChild(cow); //pat->setMatrix(osg::Matrix::scale(200000, 200000, 200000)); //osg::Matrix maaat2; //osg::ref_ptr
                               
                                 pat2 = new osg::MatrixTransform; //pat2->setMatrix(osg::Matrix::rotate(matrixGood1.getRotate())* // osg::Matrix::translate(matrixGood1.getTrans())); //pat2->addChild(pat); //root->addChild(pat2); viewer.setSceneData(root); //模型漫游器 osgGA::NodeTrackerManipulator* nodeTrack = new osgGA::NodeTrackerManipulator(); nodeTrack->setTrackNode(root); /*************************************动画漫游器**下*********************************/ GeoPoint gPoint1(s_mapNode->getMap()->getSRS(), 32, 118, 400); osg::Matrix gMatrix1; gPoint1.createLocalToWorld(gMatrix1);//获取当前地球上的正确姿态 //由于相机，自身向下看，所以在当前姿态基础上抬起60度，注意是前乘！ gMatrix1.preMultRotate(osg::Quat(osg::DegreesToRadians(60.0), osg::X_AXIS)); osg::Quat q1; gMatrix1.get(q1);//获取当前矩阵姿态 osg::Vec3d vPos1 = gMatrix1.getTrans();//获取当前矩阵位置 GeoPoint gPoint2(s_mapNode->getMap()->getSRS(), 32.01, 118.01, 400); osg::Matrix gMatrix2; gPoint2.createLocalToWorld(gMatrix2); gMatrix2.preMultRotate(osg::Quat(osg::DegreesToRadians(60.0), osg::X_AXIS)); osg::Quat q2; gMatrix2.get(q2); osg::Vec3d vPos2 = gMatrix2.getTrans(); GeoPoint gPoint3(s_mapNode->getMap()->getSRS(), 32.02, 118.02, 400); osg::Matrix gMatrix3; gPoint3.createLocalToWorld(gMatrix3); osg::Quat q3; gMatrix3.get(q3); osg::Vec3d vPos3 = gMatrix3.getTrans(); //获取相机之后再顺旋转,其实是错误的姿态 osg::Quat qbuf(osg::DegreesToRadians(60.0), osg::X_AXIS); q3 *= qbuf; //使用动画漫游器 osgGA::AnimationPathManipulator *animationPathMp = new osgGA::AnimationPathManipulator(); //给动画漫游器添加关键帧 osg::AnimationPath* _animationPath = new osg::AnimationPath; _animationPath->insert(0.0, osg::AnimationPath::ControlPoint(vPos1, q1));//姿态正确 _animationPath->insert(3.0, osg::AnimationPath::ControlPoint(vPos2, q2));//姿态正确 _animationPath->insert(6.0, osg::AnimationPath::ControlPoint(vPos3, q3));//姿态错误！ _animationPath->setLoopMode(osg::AnimationPath::SWING);//设置路径是回摆的 animationPathMp->setAnimationPath(_animationPath); /*************************************动画漫游器**上*********************************/ //这里添加三个漫游器，使用一个控制漫游器选择，按键盘‘3’就切换到路径动画漫游器了 osgGA::KeySwitchMatrixManipulator* keyPtr = new osgGA::KeySwitchMatrixManipulator(); keyPtr->addMatrixManipulator('1', "earthMan", new EarthManipulator()); keyPtr->addMatrixManipulator('2', "trakerMan", nodeTrack); keyPtr->addMatrixManipulator('3', "animationPathMan", animationPathMp); keyPtr->addMatrixManipulator('4', "earthWalkMan", new EarthWalkManipulator()); viewer.setCameraManipulator(keyPtr); //viewer.setUpViewOnSingleScreen(0); { osg::ref_ptr
                                
                                  traits = new osg::GraphicsContext::Traits; traits->x = 40; traits->y = 40; traits->width = 600; traits->height = 480; traits->windowDecoration = true; traits->doubleBuffer = true; traits->sharedContext = 0; osg::ref_ptr
                                 
                                   gc = osg::GraphicsContext::createGraphicsContext(traits.get()); osg::ref_ptr
                                  
                                    camera = new osg::Camera; camera->setGraphicsContext(gc.get()); camera->setViewport(new osg::Viewport(0, 0, traits->width, traits->height)); GLenum buffer = traits->doubleBuffer ? GL_BACK : GL_FRONT; camera->setDrawBuffer(buffer); camera->setReadBuffer(buffer); // add this slave camera to the viewer, with a shift left of the projection matrix viewer.addSlave(camera.get()); } while(!viewer.done()) viewer.frame(); return 1;}

 

由于是初级版，所以有些操作还是比较反人类···

运行起来是用其他漫游器告诉你：能看到个地球

开始操作：

1.按‘4’切换到自定义的漫游器，现在你的视点在球心，啥也看不到

2.按‘s’或者‘下’，再按‘h’现在应该是在地球表面了（别问为什么会需要这么SB的操作···）

3.然后自己体验吧（不要晕了···）

后期会更新一个有良好操作的版本

 

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