osg三角带绘制

来源：互联网发布：mysql desc 命令编辑：程序博客网时间：2024/04/28 15:41
#include <osgViewer/Viewer>#include <osgViewer/ViewerEventHandlers>#include <osg/Node>#include <osg/Group>#include <osgDB/ReadFile>#include <osgDB/WriteFile>#include <osgGA/StateSetManipulator>#include <osgUtil/Optimizer>#include <osgUtil/TriStripVisitor>osg::ref_ptr<osg::Geometry> createQuad(){    //创建一个叶节点对象    osg::ref_ptr<osg::Geode> geode = new osg::Geode() ;    //创建一个几何体对象    osg::ref_ptr<osg::Geometry> geom = new osg::Geometry() ;    //创建顶点数组，注意顶点数组是逆时针添加的    osg::ref_ptr<osg::Vec3Array> v = new osg::Vec3Array() ;    //添加数据    v->push_back(osg::Vec3(0.0f , 0.0f , 0.0f)) ;    v->push_back(osg::Vec3(1.0f , 0.0f , 0.0f)) ;    v->push_back(osg::Vec3(1.0f , 0.0f , 1.0f)) ;    v->push_back(osg::Vec3(0.0f , 0.0f , 1.0f)) ;    geom->setVertexArray(v.get()) ;    //创建纹理坐标    osg::ref_ptr<osg::Vec2Array> vt = new osg::Vec2Array() ;    //添加数据    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)) ;    //设置纹理坐标    geom->setTexCoordArray(0 , vt.get()) ;    //创建颜色数组    osg::ref_ptr<osg::Vec4Array> vc = new osg::Vec4Array() ;    vc->push_back(osg::Vec4(1.0f , 0.0f , 0.0f , 1.0f)) ;    vc->push_back(osg::Vec4(0.0f , 1.0f , 0.0f , 1.0f)) ;    vc->push_back(osg::Vec4(0.0f , 0.0f , 1.0f , 1.0f)) ;    vc->push_back(osg::Vec4(1.0f , 1.0f , 0.0f , 1.0f)) ;    //设置颜色数组    geom->setColorArray(vc.get()) ;    //绑定方式为每个顶点    geom->setColorBinding(osg::Geometry::BIND_PER_VERTEX) ;    //创建法线数组    osg::ref_ptr<osg::Vec3Array> nc = new osg::Vec3Array() ;    nc->push_back(osg::Vec3(0.0f , -1.0f , 0.0f)) ;    //设置法线数组    geom->setNormalArray(nc.get()) ;    //设置法线的绑定方式为全部顶点    geom->setNormalBinding(osg::Geometry::BIND_OVERALL) ;    //添加图元，绘图基元为四边形    geom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUADS , 0 , 4)) ;    return geom.get() ;}int main(){    osg::ref_ptr<osgViewer::Viewer> viewer = new osgViewer::Viewer() ;    // 方便查看在多边形之间切换，以查看三角网    viewer->addEventHandler(new osgGA::StateSetManipulator(viewer->getCamera()->getOrCreateStateSet())) ;    osg::ref_ptr<osg::Group> root = new osg::Group() ;    //创建一个几何体对象    osg::ref_ptr<osg::Geometry> geometry = createQuad() ;    //对几何体进行条带化    osgUtil::TriStripVisitor stripper ;    stripper.stripify(*(geometry.get())) ;    // 添加到叶节点    osg::ref_ptr<osg::Geode> geode = new  osg::Geode() ;    geode->addDrawable(geometry.get()) ;    //添加到场景    root->addChild(geode.get()) ;    osgUtil::Optimizer optimizer ;    optimizer.optimize(root.get()) ;    viewer->setSceneData(root.get()) ;    viewer->realize() ;    viewer->run() ;    return 0 ;}
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