[原][osg]例子osgtereoimage 立体图像显示方案

#include <osgViewer/Viewer>
#include <osgDB/fstream>
#include <osgDB/ReadFile>
#include <osgDB/WriteFile>
#include <osgUtil/Optimizer>

#include <osg/ImageStream>
#include <osg/Geode>
#include <osg/Notify>
#include <osg/MatrixTransform>
#include <osg/Switch>
#include <osg/TexMat>
#include <osg/Texture2D>

#include <iostream>

typedef std::vector<std::string> FileList;

#include <osg/Program>
#include <osg/Shader>

osg::StateSet* createColorToGreyscaleStateSet()
{
    osg::StateSet* stateset = new osg::StateSet;

    osg::Program* program = new osg::Program;
    stateset->setAttribute(program);

    const char* fragSource =
    {
        "uniform sampler2D baseTexture;\n"
        "uniform mat4 colorMatrix;\n"
        "void main(void)\n"
        "{\n"
        "    vec4 color = texture2D( baseTexture, gl_TexCoord[0].st );\n"
        "    gl_FragColor = colorMatrix * color;\n"
        "}\n"
    };
    program->addShader(new osg::Shader(osg::Shader::FRAGMENT, fragSource));

    stateset->addUniform(new osg::Uniform("baseTexture", 0));

    osg::Matrixf colorMatrix(
        0.3f, 0.3f, 0.3f, 0.0f,
        0.59f, 0.59f, 0.59f, 0.0f,
        0.11f, 0.11f, 0.11f, 0.0f,
        0.0f, 0.0f, 0.0f, 1.0f
    );

    stateset->addUniform(new osg::Uniform("colorMatrix", colorMatrix));

    return stateset;
}


osg::Geode* createSectorForImage(osg::Image* image, osg::TexMat* texmat, float s, float t, float radius, float height, float length)
{
    bool flip = image->getOrigin() == osg::Image::TOP_LEFT;

    int numSegments = 20;
    float Theta = length / radius;
    float dTheta = Theta / (float)(numSegments - 1);

    float ThetaZero = height*s / (t*radius);

    // set up the texture.
    osg::Texture2D* texture = new osg::Texture2D;
    texture->setFilter(osg::Texture2D::MIN_FILTER, osg::Texture2D::LINEAR);
    texture->setFilter(osg::Texture2D::MAG_FILTER, osg::Texture2D::LINEAR);
    texture->setWrap(osg::Texture2D::WRAP_S, osg::Texture2D::CLAMP_TO_BORDER);
    texture->setWrap(osg::Texture2D::WRAP_T, osg::Texture2D::CLAMP_TO_BORDER);
    texture->setResizeNonPowerOfTwoHint(false);
    texture->setImage(image);

    // set up the drawstate.
    osg::StateSet* dstate = new osg::StateSet;
    dstate->setMode(GL_CULL_FACE, osg::StateAttribute::OFF);
    dstate->setMode(GL_LIGHTING, osg::StateAttribute::OFF);
    dstate->setTextureAttributeAndModes(0, texture, osg::StateAttribute::ON);
    dstate->setTextureAttribute(0, texmat);

    // set up the geoset.
    osg::Geometry* geom = new osg::Geometry;
    geom->setStateSet(dstate);

    osg::Vec3Array* coords = new osg::Vec3Array();
    osg::Vec2Array* tcoords = new osg::Vec2Array();

    int i;
    float angle = -Theta / 2.0f;
    for (i = 0;
        i<numSegments;
        ++i, angle += dTheta)
    {
        coords->push_back(osg::Vec3(sinf(angle)*radius, cosf(angle)*radius, height*0.5f)); // top
        coords->push_back(osg::Vec3(sinf(angle)*radius, cosf(angle)*radius, -height*0.5f)); // bottom.

        tcoords->push_back(osg::Vec2(angle / ThetaZero + 0.5f, flip ? 0.0f : 1.0f)); // top
        tcoords->push_back(osg::Vec2(angle / ThetaZero + 0.5f, flip ? 1.0f : 0.0f)); // bottom.

    }

    osg::Vec4Array* colors = new osg::Vec4Array();
    colors->push_back(osg::Vec4(1.0f, 1.0f, 1.0f, 1.0f));

    osg::DrawArrays* elements = new osg::DrawArrays(osg::PrimitiveSet::QUAD_STRIP, 0, coords->size());



    geom->setVertexArray(coords);
    geom->setTexCoordArray(0, tcoords);
    geom->setColorArray(colors, osg::Array::BIND_OVERALL);

    geom->addPrimitiveSet(elements);

    // set up the geode.
    osg::Geode* geode = new osg::Geode;
    geode->addDrawable(geom);

    return geode;

}

osg::Group * loadImages(std::string image1, std::string image2, osg::TexMat* texmatLeft, osg::TexMat* texmatRight, float radius, float height, float length)
{
    osg::ref_ptr<osg::Image> imageLeft = osgDB::readRefImageFile(image1);
    osg::ref_ptr<osg::Image> imageRight = osgDB::readRefImageFile(image2);
    if (imageLeft.valid() && imageRight.valid())
    {
        osg::ImageStream* streamLeft = dynamic_cast<osg::ImageStream*>(imageLeft.get());
        if (streamLeft) streamLeft->play();

        osg::ImageStream* streamRight = dynamic_cast<osg::ImageStream*>(imageRight.get());
        if (streamRight) streamRight->play();


        float average_s = (imageLeft->s() + imageRight->s())*0.5f;
        float average_t = (imageLeft->t() + imageRight->t())*0.5f;
        osg::Geode* geodeLeft = createSectorForImage(imageLeft.get(), texmatLeft, average_s, average_t, radius, height, length);
        geodeLeft->setNodeMask(0x01);

        osg::Geode* geodeRight = createSectorForImage(imageRight.get(), texmatRight, average_s, average_t, radius, height, length);
        geodeRight->setNodeMask(0x02);

        osg::Group * imageGroup = new osg::Group;

        imageGroup->addChild(geodeLeft);
        imageGroup->addChild(geodeRight);
        return imageGroup;
    }
    else
    {
        std::cout << "Warning: Unable to load both image files, '" << image1 << "' & '" << image2 << "', required for stereo imaging." << std::endl;
        return 0;
    }
}

// create a switch containing a set of child each containing a
// stereo image pair.
osg::Switch* createScene(FileList fileList, osg::TexMat* texmatLeft, osg::TexMat* texmatRight, float radius, float height, float length)
{
    osg::Switch* sw = new osg::Switch;

    // load the images.
    for (unsigned int i = 0; i + 1<fileList.size(); i += 2)
    {
        osg::Group * imageGroup = loadImages(fileList[i], fileList[i + 1], texmatLeft, texmatRight, radius, height, length);
        if (imageGroup) sw->addChild(imageGroup);
    }


    if (sw->getNumChildren()>0)
    {
        // select first child.
        sw->setSingleChildOn(0);
    }

    return sw;
}

class SlideEventHandler : public osgGA::GUIEventHandler
{
public:

    SlideEventHandler();

    META_Object(osgStereImageApp, SlideEventHandler);


    void set(osg::Switch* sw, float offsetX, float offsetY, osg::TexMat* texmatLeft, osg::TexMat* texmatRight, float timePerSlide, bool autoSteppingActive);

    void set(FileList fileList, osg::Switch* sw, float offsetX, float offsetY, osg::TexMat* texmatLeft, osg::TexMat* texmatRight, float radius, float height, float length, float timePerSlide, bool autoSteppingActive);


    virtual bool handle(const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter&);

    virtual void getUsage(osg::ApplicationUsage& usage) const;

    virtual void operator()(osg::Node* node, osg::NodeVisitor* nv);

    void nextSlide();

    void previousSlide();

    void scaleImage(float s);

    void offsetImage(float ds, float dt);

    void rotateImage(float rx, float ry);

    void initTexMatrices();

protected:

    ~SlideEventHandler() {}
    SlideEventHandler(const SlideEventHandler&, const osg::CopyOp&) {}

    osg::ref_ptr<osg::Switch>   _switch;
    osg::ref_ptr<osg::TexMat>   _texmatLeft;
    osg::ref_ptr<osg::TexMat>   _texmatRight;
    float                        _radius;
    float                        _height;
    float                        _length;
    bool                        _firstTraversal;
    unsigned int                _activeSlide;
    double                      _previousTime;
    double                      _timePerSlide;
    bool                        _autoSteppingActive;
    float                       _initSeperationX;
    float                       _currentSeperationX;
    float                       _initSeperationY;
    float                       _currentSeperationY;
    FileList                     _fileList;

};

SlideEventHandler::SlideEventHandler() :
    _switch(0),
    _texmatLeft(0),
    _texmatRight(0),
    _firstTraversal(true),
    _activeSlide(0),
    _previousTime(-1.0f),
    _timePerSlide(5.0),
    _autoSteppingActive(false)
{
}

void SlideEventHandler::set(osg::Switch* sw, float offsetX, float offsetY, osg::TexMat* texmatLeft, osg::TexMat* texmatRight, float timePerSlide, bool autoSteppingActive)
{
    _switch = sw;
    _switch->setUpdateCallback(this);

    _texmatLeft = texmatLeft;
    _texmatRight = texmatRight;

    _timePerSlide = timePerSlide;
    _autoSteppingActive = autoSteppingActive;

    _initSeperationX = offsetX;
    _currentSeperationX = _initSeperationX;

    _initSeperationY = offsetY;
    _currentSeperationY = _initSeperationY;

    initTexMatrices();

}

void SlideEventHandler::set(FileList fileList, osg::Switch* sw, float offsetX, float offsetY, osg::TexMat* texmatLeft, osg::TexMat* texmatRight, float radius, float height, float length, float timePerSlide, bool autoSteppingActive)
{
    _switch = sw;
    _switch->setUpdateCallback(this);
    _fileList = FileList(fileList);

    osg::ref_ptr<osg::Group> imageGroup = loadImages(fileList[0], fileList[1], texmatLeft, texmatRight, radius, height, length);
    if (imageGroup.get())_switch->addChild(imageGroup.get());

    _texmatLeft = texmatLeft;
    _texmatRight = texmatRight;

    _radius = radius;
    _height = height;
    _length = length;

    _timePerSlide = timePerSlide;
    _autoSteppingActive = autoSteppingActive;

    _initSeperationX = offsetX;
    _currentSeperationX = _initSeperationX;

    _initSeperationY = offsetY;
    _currentSeperationY = _initSeperationY;

    initTexMatrices();
}


bool SlideEventHandler::handle(const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter&)
{
    switch (ea.getEventType())
    {
    case(osgGA::GUIEventAdapter::KEYDOWN):
    {
        if (ea.getKey() == 'a')
        {
            _autoSteppingActive = !_autoSteppingActive;
            _previousTime = ea.getTime();
            return true;
        }
        else if ((ea.getKey() == 'n') || (ea.getKey() == osgGA::GUIEventAdapter::KEY_Right))
        {
            nextSlide();
            return true;
        }
        else if ((ea.getKey() == 'p') || (ea.getKey() == osgGA::GUIEventAdapter::KEY_Left))
        {
            previousSlide();
            return true;
        }
        else if ((ea.getKey() == 'w') || (ea.getKey() == osgGA::GUIEventAdapter::KEY_KP_Add))
        {
            scaleImage(0.99f);
            return true;
        }
        else if ((ea.getKey() == 's') || (ea.getKey() == osgGA::GUIEventAdapter::KEY_KP_Subtract))
        {
            scaleImage(1.01f);
            return true;
        }
        else if (ea.getKey() == 'j')
        {
            offsetImage(-0.001f, 0.0f);
            return true;
        }
        else if (ea.getKey() == 'k')
        {
            offsetImage(0.001f, 0.0f);
            return true;
        }
        else if (ea.getKey() == 'i')
        {
            offsetImage(0.0f, -0.001f);
            return true;
        }
        else if (ea.getKey() == 'm')
        {
            offsetImage(0.0f, 0.001f);
            return true;
        }
        else if (ea.getKey() == ' ')
        {
            initTexMatrices();
            return true;
        }
        return false;
    }
    case(osgGA::GUIEventAdapter::DRAG):
    case(osgGA::GUIEventAdapter::MOVE):
    {
        static float px = ea.getXnormalized();
        static float py = ea.getYnormalized();

        float dx = ea.getXnormalized() - px;
        float dy = ea.getYnormalized() - py;

        px = ea.getXnormalized();
        py = ea.getYnormalized();

        rotateImage(dx, dy);

        return true;
    }

    default:
        return false;
    }
}

void SlideEventHandler::getUsage(osg::ApplicationUsage& usage) const
{
    usage.addKeyboardMouseBinding("Space", "Reset the image position to center");
    usage.addKeyboardMouseBinding("a", "Toggle on/off the automatic advancement for image to image");
    usage.addKeyboardMouseBinding("n", "Advance to next image");
    usage.addKeyboardMouseBinding("p", "Move to previous image");
    usage.addKeyboardMouseBinding("q", "Zoom into the image");
    usage.addKeyboardMouseBinding("a", "Zoom out of the image");
    usage.addKeyboardMouseBinding("j", "Reduce horizontal offset");
    usage.addKeyboardMouseBinding("k", "Increase horizontal offset");
    usage.addKeyboardMouseBinding("m", "Reduce vertical offset");
    usage.addKeyboardMouseBinding("i", "Increase vertical offset");
}

void SlideEventHandler::operator()(osg::Node* node, osg::NodeVisitor* nv)
{
    if (_autoSteppingActive && nv->getFrameStamp())
    {
        double time = nv->getFrameStamp()->getSimulationTime();

        if (_firstTraversal)
        {
            _firstTraversal = false;
            _previousTime = time;
        }
        else if (time - _previousTime>_timePerSlide)
        {
            _previousTime = time;

            nextSlide();
        }

    }

    traverse(node, nv);
}

void SlideEventHandler::nextSlide()
{

    if (_switch->getNumChildren() == 0) return;

    ++_activeSlide;

    if (_fileList.size()>0) {
        if (_activeSlide >= _fileList.size() / 2) _activeSlide = 0;
        osg::ref_ptr<osg::Group> images = loadImages(_fileList[2 * _activeSlide], _fileList[2 * _activeSlide + 1], _texmatLeft.get(), _texmatRight.get(), _radius, _height, _length);
        if (images.valid()) _switch->replaceChild(_switch->getChild(0), images.get());

    }
    else {
        if (_activeSlide >= _switch->getNumChildren()) _activeSlide = 0;

        _switch->setSingleChildOn(_activeSlide);
    }
}

void SlideEventHandler::previousSlide()
{
    if (_switch->getNumChildren() == 0) return;

    if (_fileList.size()>0) {
        if (_activeSlide == 0) _activeSlide = _fileList.size() / 2 - 1;
        else --_activeSlide;
        osg::ref_ptr<osg::Group> images = loadImages(_fileList[2 * _activeSlide], _fileList[2 * _activeSlide + 1], _texmatLeft.get(), _texmatRight.get(), _radius, _height, _length);
        if (images.valid()) _switch->replaceChild(_switch->getChild(0), images.get());
    }
    else {
        if (_activeSlide == 0) _activeSlide = _switch->getNumChildren() - 1;
        else --_activeSlide;

        _switch->setSingleChildOn(_activeSlide);
    }
}

void SlideEventHandler::scaleImage(float s)
{
    _texmatLeft->setMatrix(_texmatLeft->getMatrix()*osg::Matrix::translate(-0.5f, -0.5f, 0.0f)*osg::Matrix::scale(s, s, 1.0f)*osg::Matrix::translate(0.5f, 0.5f, 0.0f));
    _texmatRight->setMatrix(_texmatRight->getMatrix()*osg::Matrix::translate(-0.5f, -0.5f, 0.0f)*osg::Matrix::scale(s, s, 1.0f)*osg::Matrix::translate(0.5f, 0.5f, 0.0f));
}

void SlideEventHandler::offsetImage(float ds, float dt)
{
    _currentSeperationX += ds;
    _currentSeperationY += dt;
    osg::notify(osg::NOTICE) << "image offset x = " << _currentSeperationX << "  y =" << _currentSeperationY << std::endl;
    _texmatLeft->setMatrix(_texmatLeft->getMatrix()*osg::Matrix::translate(ds, dt, 0.0f));
    _texmatRight->setMatrix(_texmatRight->getMatrix()*osg::Matrix::translate(-ds, -dt, 0.0f));
}

void SlideEventHandler::rotateImage(float rx, float ry)
{
    const float scale = 0.5f;
    _texmatLeft->setMatrix(_texmatLeft->getMatrix()*osg::Matrix::translate(-rx*scale, -ry*scale, 0.0f));
    _texmatRight->setMatrix(_texmatRight->getMatrix()*osg::Matrix::translate(-rx*scale, -ry*scale, 0.0f));
}

void SlideEventHandler::initTexMatrices()
{
    _texmatLeft->setMatrix(osg::Matrix::translate(_initSeperationX, _initSeperationY, 0.0f));
    _texmatRight->setMatrix(osg::Matrix::translate(-_initSeperationX, -_initSeperationY, 0.0f));
}



int main(int argc, char **argv)
{
    // use an ArgumentParser object to manage the program arguments.
    osg::ArgumentParser arguments(&argc, argv);

    // set up the usage document, in case we need to print out how to use this program.
    arguments.getApplicationUsage()->setDescription(arguments.getApplicationName() + " is the example which demonstrates use node masks to create stereo images.");
    arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName() + " [options] image_file_left_eye image_file_right_eye");
    arguments.getApplicationUsage()->addCommandLineOption("-d <float>", "Time delay in seconds between the display of successive image pairs when in auto advance mode.");
    arguments.getApplicationUsage()->addCommandLineOption("-a", "Enter auto advance of image pairs on start up.");
    arguments.getApplicationUsage()->addCommandLineOption("-x <float>", "Horizontal offset of left and right images.");
    arguments.getApplicationUsage()->addCommandLineOption("-y <float>", "Vertical offset of left and right images.");
    arguments.getApplicationUsage()->addCommandLineOption("--disk", "Keep images on disk");
    arguments.getApplicationUsage()->addCommandLineOption("-files <filename>", "Load filenames from a file");
    arguments.getApplicationUsage()->addCommandLineOption("-h or --help", "Display this information");
    arguments.getApplicationUsage()->addCommandLineOption("--SingleThreaded", "Select SingleThreaded threading model for viewer.");
    arguments.getApplicationUsage()->addCommandLineOption("--CullDrawThreadPerContext", "Select CullDrawThreadPerContext threading model for viewer.");
    arguments.getApplicationUsage()->addCommandLineOption("--DrawThreadPerContext", "Select DrawThreadPerContext threading model for viewer.");
    arguments.getApplicationUsage()->addCommandLineOption("--CullThreadPerCameraDrawThreadPerContext", "Select CullThreadPerCameraDrawThreadPerContext threading model for viewer.");


    // construct the viewer.
    osgViewer::Viewer viewer(arguments);

    // register the handler to add keyboard and mouse handling.
    SlideEventHandler* seh = new SlideEventHandler();
    viewer.addEventHandler(seh);

    // read any time delay argument.
    float timeDelayBetweenSlides = 5.0f;
    while (arguments.read("-d", timeDelayBetweenSlides)) {}

    bool autoSteppingActive = false;
    while (arguments.read("-a")) autoSteppingActive = true;

    float offsetX = 0.1f;
    while (arguments.read("-x", offsetX)) {}

    float offsetY = 0.0f;
    while (arguments.read("-y", offsetY)) {}

    bool onDisk = false;
    while (arguments.read("--disk")) { onDisk = true; }

    std::string filename = "";
    FileList fileList;
    // extract the filenames from the a file, one filename per line.
    while (arguments.read("-files", filename)) {
        osgDB::ifstream is(filename.c_str());
        if (is) {
            std::string line;
            while (std::getline(is, line, '\n')) fileList.push_back(line);
            is.close();
        }

    }

    // if user request help write it out to cout.
    if (arguments.read("-h") || arguments.read("--help"))
    {
        arguments.getApplicationUsage()->write(std::cout);
        return 1;
    }

    osgViewer::Viewer::ThreadingModel threading = osgViewer::Viewer::SingleThreaded;
    while (arguments.read("--SingleThreaded")) threading = osgViewer::Viewer::SingleThreaded;
    while (arguments.read("--CullDrawThreadPerContext")) threading = osgViewer::Viewer::CullDrawThreadPerContext;
    while (arguments.read("--DrawThreadPerContext")) threading = osgViewer::Viewer::DrawThreadPerContext;
    while (arguments.read("--CullThreadPerCameraDrawThreadPerContext")) threading = osgViewer::Viewer::CullThreadPerCameraDrawThreadPerContext;

    viewer.setThreadingModel(threading);

    // any option left unread are converted into errors to write out later.
    arguments.reportRemainingOptionsAsUnrecognized();

    // report any errors if they have occurred when parsing the program arguments.
    if (arguments.errors())
    {
        arguments.writeErrorMessages(std::cout);
        return 1;
    }

    // extract the filenames from the arguments list.
    for (int pos = 1; pos<arguments.argc(); ++pos)
    {
        if (arguments.isString(pos)) fileList.push_back(arguments[pos]);
    }

    if (fileList.empty())
    {
        fileList.push_back("E:/temp/1.jpg");
        fileList.push_back("E:/temp/2.jpg");
        //fileList.push_back("E:/temp/left.png");
        //fileList.push_back("E:/temp/right.png");
    }
    else if (fileList.size()<2)
    {
        arguments.getApplicationUsage()->write(std::cout, osg::ApplicationUsage::COMMAND_LINE_OPTION);
        return 1;
    }


    osg::ref_ptr<osg::GraphicsContext::Traits> traits = new osg::GraphicsContext::Traits;
    traits->x = 0;
    traits->y = 0;
    traits->width = 1920;
    traits->height = 1080;
    traits->windowDecoration = true;
    traits->doubleBuffer = true;
    traits->sharedContext = 0;

    osg::ref_ptr<osg::GraphicsContext> gc = osg::GraphicsContext::createGraphicsContext(traits.get());

    osg::ref_ptr<osg::Camera> 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);
    viewer.addSlave(camera);


    // now the windows have been realized we switch off the cursor to prevent it
    // distracting the people seeing the stereo images.
    double fovy, aspectRatio, zNear, zFar;
    viewer.getCamera()->getProjectionMatrixAsPerspective(fovy, aspectRatio, zNear, zFar);

    float radius = 1.0f;
    float height = 2 * radius*tan(osg::DegreesToRadians(fovy)*0.5f);
    float length = osg::PI*radius;  // half a cylinder.

                                    // use a texture matrix to control the placement of the image.
    osg::TexMat* texmatLeft = new osg::TexMat;
    osg::TexMat* texmatRight = new osg::TexMat;

    // create the scene from the file list.
    osg::ref_ptr<osg::Switch> rootNode;
    if (!onDisk)  rootNode = createScene(fileList, texmatLeft, texmatRight, radius, height, length);
    else rootNode = new osg::Switch();

    //osgDB::writeNodeFile(*rootNode,"test.osgt");



    viewer.getCamera()->setCullMask(0xffffffff);
    viewer.getCamera()->setCullMaskLeft(0x00000001);
    viewer.getCamera()->setCullMaskRight(0x00000002);

    // set up the use of stereo by default.
    osg::DisplaySettings::instance()->setStereo(true);

    //osg::DisplaySettings::instance()->setStereoMode(osg::DisplaySettings::HORIZONTAL_SPLIT);
    if (osg::DisplaySettings::instance()->getStereoMode() == osg::DisplaySettings::ANAGLYPHIC)
    {
        rootNode->setStateSet(createColorToGreyscaleStateSet());
    }

    //osg::DisplaySettings::instance()->setStereo(true);
    //osg::DisplaySettings::instance()->setStereoMode(osg::DisplaySettings::HORIZONTAL_SPLIT);


    // set the scene to render
    viewer.setSceneData(rootNode.get());


    // create the windows and run the threads.
    viewer.realize();


    // switch off the cursor
    osgViewer::Viewer::Windows windows;
    viewer.getWindows(windows);
    for (osgViewer::Viewer::Windows::iterator itr = windows.begin();
        itr != windows.end();
        ++itr)
    {
        (*itr)->useCursor(false);
    }

    viewer.setFusionDistance(osgUtil::SceneView::USE_FUSION_DISTANCE_VALUE, radius);

    // set up the SlideEventHandler.
    if (onDisk) seh->set(fileList, rootNode.get(), offsetX, offsetY, texmatLeft, texmatRight, radius, height, length, timeDelayBetweenSlides, autoSteppingActive);
    else seh->set(rootNode.get(), offsetX, offsetY, texmatLeft, texmatRight, timeDelayBetweenSlides, autoSteppingActive);

    osg::Matrix homePosition;
    homePosition.makeLookAt(osg::Vec3(0.0f, 0.0f, 0.0f), osg::Vec3(0.0f, 1.0f, 0.0f), osg::Vec3(0.0f, 0.0f, 1.0f));


    ////设置图形环境特性
    //osg::ref_ptr<osg::GraphicsContext::Traits> traits = new osg::GraphicsContext::Traits();
    //traits->x = 0;
    //traits->y = 0;
    //traits->width = 1000;
    //traits->height = 800;
    //traits->windowDecoration = true;
    //traits->doubleBuffer = true;
    //traits->sharedContext = 0;

    ////创建图形环境特性
    //osg::ref_ptr<osg::GraphicsContext> gc = osg::GraphicsContext::createGraphicsContext(traits.get());
    //if (gc.valid())
    //{
    //    osg::notify(osg::INFO) << "  GraphicsWindow has been created successfully." << std::endl;

    //    //清除窗口颜色及清除颜色和深度缓冲
    //    gc->setClearColor(osg::Vec4f(0.2f, 0.2f, 0.6f, 1.0f));
    //    gc->setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    //}
    //else
    //{
    //    osg::notify(osg::NOTICE) << "  GraphicsWindow has not been created successfully." << std::endl;
    //}

    ////根据分辨率来确定合适的投影来保证显示的图形不变形
    //double fovy, aspectRatio, zNear, zFar;
    //viewer.getCamera()->getProjectionMatrixAsPerspective(fovy, aspectRatio, zNear, zFar);
    //double newAspectRatio = double(traits->width) / double(traits->height);
    //double aspectRatioChange = newAspectRatio / aspectRatio;
    //if (aspectRatioChange != 1.0)
    //{
    //    //设置投影矩阵
    //    viewer.getCamera()->getProjectionMatrix() *= osg::Matrix::scale(1.0 / aspectRatioChange, 1.0, 1.0);
    //}

    ////设置视口
    //viewer.getCamera()->setViewport(new osg::Viewport(0, 0, traits->width, traits->height));
    ////设置图形环境
    //viewer.getCamera()->setGraphicsContext(gc.get());

    while (!viewer.done())
    {
        viewer.getCamera()->setViewMatrix(homePosition);

        // fire off the cull and draw traversals of the scene.
        viewer.frame();

    }

    return 0;
}

 

 

设置立体投影方式的是这部分代码：

 //osg::DisplaySettings::instance()->setStereoMode(osg::DisplaySettings::HORIZONTAL_SPLIT);

其中的enum如下：

        enum StereoMode
        {
            QUAD_BUFFER,
            ANAGLYPHIC,
            HORIZONTAL_SPLIT,
            VERTICAL_SPLIT,
            LEFT_EYE,
            RIGHT_EYE,
            HORIZONTAL_INTERLACE,
            VERTICAL_INTERLACE,
            CHECKERBOARD
        };

关于此类型的详细介绍链接

 

本文使用的图片

   

1.jpg

 

     

2.jpg

 /*******************************************************************************************程序员专用分割线***************************************************************************************************************************/

 程序效果：

ANAGLYPHIC：

 

 

HORIZONTAL_SPLIT：