OpenSceneGraph3.4.0+Qt5.6.1MinGW开发环境部署

Posted 2020-10-31 kaikai-king

                                                                                                  

基本步骤如下描述：

Step1：CMake3.10编译openscenegraph3.4.0，生成makefile文件（中间过程可能会涉及到很多三方库，需要下载编译，然后按cmake-gui界面的提示正确配置路径即可）；

                                                                                

                                                                                  

Step2：在生成的makefile文件目录下，新建run.bat文件，双击运行，即可生成动态库dll文件和静态库a文件

           填写两行命令：mingw32-make

                               mingw32-make install

Step3：demo测试，新建Qt控制台工程osgVR。

           1）将生成的include文件和lib文件放置到工程根目录下，然后将工程文件osgVR.pro的内容更改如下：

                                                                                 

           2）将main.cpp的内容修改如下：

                   #include <osgViewer/Viewer>

            #include <osg/Node>

            #include <osg/Geode>

            #include <osg/Geometry>

            #include <osg/Group>

            #include <osg/Billboard>

            #include <osg/Texture2D>

            #include <osg/Image>

            #include <osg/PositionAttitudeTransform>

            #include <osg/MatrixTransform>

            #include <osgDB/ReadFile>

            #include <osgDB/WriteFile>

            #include <osgUtil/Optimizer>

            int xoffset = 200;

            int yoffset = 200;

           osg::ref_ptr<osg::Node> createBillboardTree(osg::ref_ptr<osg::Image> image)

         {

                  //创建四边形

                 osg::ref_ptr<osg::Geometry> geometry = new osg::Geometry();

                 //设置顶点

                 osg::ref_ptr<osg::Vec3Array> v = new osg::Vec3Array();

                 v->push_back(osg::Vec3(-0.5f, 0.0f, -0.5f));

                 v->push_back(osg::Vec3(0.5f, 0.0f, -0.5f));

                 v->push_back(osg::Vec3(0.5f, 0.0f, 0.5f));

                 v->push_back(osg::Vec3(-0.5f, 0.0f, 0.5f));

                geometry->setVertexArray(v.get());

                  //设置法线

                osg::ref_ptr<osg::Vec3Array> normal = new osg::Vec3Array();

                normal->push_back(osg::Vec3(1.0f, 0.0f, 0.0f) ^ osg::Vec3(0.0f, 0.0f, 1.0f));

                geometry->setNormalArray(normal.get());

                geometry->setNormalBinding(osg::Geometry::BIND_OVERALL);

                 //设置纹理坐标

               osg::ref_ptr<osg::Vec2Array> vt = new osg::Vec2Array();

               vt->push_back(osg::Vec2(0.0f, 0.0f));

               vt->push_back(osg::Vec2(1.0f, 0.0f));

               vt->push_back(osg::Vec2(1.0f, 1.0f));

               vt->push_back(osg::Vec2(0.0f, 1.0f));

               geometry->setTexCoordArray(0, vt.get());

                 //绘制四边形

              geometry->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUADS, 0, 4));

              if (image.get())

           {

                //状态属性对象

               osg::ref_ptr<osg::StateSet> stateset = new osg::StateSet();

                //创建一个Texture2D属性对象

               osg::ref_ptr<osg::Texture2D> texture = new osg::Texture2D();

                //关联image

              texture->setImage(image.get());

                //关联Texture2D纹理对象，第三个参数默认为ON

              stateset->setTextureAttributeAndModes(0, texture, osg::StateAttribute::ON);

                //启用混合

              stateset->setMode(GL_BLEND, osg::StateAttribute::ON);

                //关闭光照

              stateset->setMode(GL_LIGHTING, osg::StateAttribute::OFF);

               geometry->setStateSet(stateset.get());

           }

               //创建Billboard对象一

             osg::ref_ptr<osg::Billboard> billboard1 = new osg::Billboard();

             //设置旋转模式为绕视点

             billboard1->setMode(osg::Billboard::POINT_ROT_EYE);

             //添加Drawable，并设置其位置，默认位置为osg::Vec3(0.0f,0.0f,0.0f) ;

             billboard1->addDrawable(geometry.get(), osg::Vec3(5.0f, 0.0f, 0.0f));

            osg::ref_ptr<osg::Billboard> billboard2 = new osg::Billboard();

            //设置旋转模式为绕轴转，因此还需要设置转轴

             billboard2->setMode(osg::Billboard::AXIAL_ROT);

            //设置旋转轴

            billboard2->setAxis(osg::Vec3(0.0f, 0.0f, 1.0f));

            billboard2->addDrawable(geometry.get(), osg::Vec3(10.0f, 0.0f, 0.0f));

            osg::ref_ptr<osg::Group> billboard = new osg::Group();

            billboard->addChild(billboard1.get());

            billboard->addChild(billboard2.get());

            return billboard.get();

        }

         int main()

      {

           osg::ref_ptr<osgViewer::Viewer> viewer = new osgViewer::Viewer();

           osg::ref_ptr<osg::GraphicsContext::Traits> traits = new osg::GraphicsContext::Traits;

           traits->x = xoffset + 0;

           traits->y = yoffset + 0;

           traits->width = 800;

           traits->height = 600;

           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.get(), osg::Matrixd::translate(0.0, 0.0, 0.0), osg::Matrixd());

           osg::ref_ptr<osg::Group> root = new osg::Group();

           //读取图像

           osg::ref_ptr<osg::Image> image = osgDB::readImageFile("images/tree0.rgba");

           //缩放一下，以达到合适的大小

           osg::ref_ptr<osg::PositionAttitudeTransform> pat = new osg::PositionAttitudeTransform();

           pat->setScale(osg::Vec3(5.0f, 5.0f, 5.0f));

           pat->addChild(createBillboardTree(image.get()));

           root->addChild(pat.get());

          //读取robot的模型，以对比

          root->addChild(osgDB::readNodeFile("robot.osg"));

         //优化场景数据

         osgUtil::Optimizer optimizer;

         optimizer.optimize(root.get());

         viewer->setSceneData(root.get());

         viewer->realize();

         viewer->run();

         return 0;

     }

运行效果：