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《OpenSceneGraph三维渲染引擎编程指南》由清华大学出版社出版 《OpenSceneGraph三维渲染引擎设计与实践》由清华大学出版社出版 以下是基于上述书籍的个人总结 创建C++项目后，首先需要配置OSG环境，具体步骤如下：
第六步：新建OSG项目测试
配置OSG环境时，需要包含以下头文件： #include <osg/...> #include <osg/ggeode/...> #include <osg/geometry/...> #include <osg/group/...> #include <osg/transform/...> #include <osg/positionattitudetransform/...> #include <osg/camera/...> #include <osg/trackballmanipulator/...> #include <osg/readfile/...> #include <osg/writefile/...> #include <osg/util/optimizer/...> #include <osg/viewer/...> #include <osg/viewer/EventHandler/...>
代码示例：
// stdafx.h#include #include #include #include #include #include #include #include #include #include #include #include #include #include
多视图渲染实现： 在OSG中，多视图的管理通过osgViewer::CompositeViewer实现。具体步骤如下：
设置图形环境特性 创建图形环境特性 创建视图 设置视图场景数据 根据分辨率确定合适的投影 设置相机视口及图形环境 设置操作器 添加事件处理 以下是具体实现代码：
// 创建图形环境特性osg::ref_ptr traits = new osg::GraphicsContext::Traits();traits->x = 100;traits->y = 100;traits->width = 900;traits->height = 700;traits->windowDecoration = true;traits->doubleBuffer = true;traits->sharedContext = 0;osg::ref_ptr gc;if (gc.valid()) { gc->setClearColor(osg::Vec4f(0.2f, 0.2f, 1.6f, 1.0f)); gc->setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);}// 创建CompositeViewerosg::ref_ptr viewer = new osgViewer::CompositeViewer();// 添加视图void View1(osg::ref_ptr viewer, osg::ref_ptr node, osg::ref_ptr traits, osg::ref_ptr gc) { osg::ref_ptr view = new osgViewer::View(); viewer->addView(view.get()); view->setSceneData(node.get()); view->getCamera()->setViewport(new osg::Viewport(0, 0, traits->width / 2, traits->height / 2)); view->getCamera()->setGraphicsContext(gc.get()); view->setCameraManipulator(new osgGA::TrackballManipulator); view->addEventHandler(new osgViewer::StatsHandler); view->addEventHandler(new osgViewer::WindowSizeHandler); view->addEventHandler(new osgViewer::ThreadingHandler); view->addEventHandler(new osgViewer::RecordCameraPathHandler); } void View2(osg::ref_ptr viewer, osg::ref_ptr node, osg::ref_ptr traits, osg::ref_ptr gc) { osg::ref_ptr view = new osgViewer::View(); viewer->addView(view.get()); view->setSceneData(node.get()); view->getCamera()->setViewport(new osg::Viewport(traits->width / 2, 0, traits->width / 2, traits->height / 2)); view->getCamera()->setGraphicsContext(gc.get()); view->setCameraManipulator(new osgGA::TrackballManipulator); } void View3(osg::ref_ptr viewer, osg::ref_ptr node, osg::ref_ptr traits, osg::ref_ptr gc) { osg::ref_ptr view = new osgViewer::View(); viewer->addView(view.get()); view->setSceneData(node.get()); double fovy, aspectRatio, zNear, zFar; view->getCamera()->getProjectionMatrixAsPerspective(fovy, aspectRatio, zNear, zFar); double newAspectRatio = traits->width / (traits->height / 2); double aspectRatioChange = newAspectRatio / aspectRatio; if (aspectRatioChange != 1.0) { view->getCamera()->getProjectionMatrix() *= osg::Matrix::scale(1.0 / aspectRatioChange, 1.0, 1.0); } view->getCamera()->setViewport(new osg::Viewport(0, traits->height / 2, traits->width / 2, traits->height / 2)); view->getCamera()->setGraphicsContext(gc.get()); view->setCameraManipulator(new osgGA::TrackballManipulator); } // 读取模型并优化 osg::ref_ptr cow = osgDB::readNodeFile("cow.osg"); osg::ref_ptr cessna = osgDB::readNodeFile("cessna.osg"); osgUtil::Optimizer optimizer; optimizer.optimize(cow.get()); optimizer.optimize(cessna.get()); // 创建并设置图形环境 osg::ref_ptr traits = new osg::GraphicsContext::Traits(); osg::ref_ptr gc = CreateGraphicsContext(traits); // 初始化CompositeViewer viewer->realize(); return viewer->run();
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