Geometry.rar

/********************************************************** *Write by FlySky *zzuxp@163.com http://www.OsgChina.org **********************************************************/ #include <osgViewer/Viewer> #include <osg/Node> #include <osg/Geode> #include <osg/Group> #include <osgDB/ReadFile> #include <osgDB/WriteFile> #include <osgUtil/Optimizer> //创建一个四边形节点 osg::Node* createQuad() { //创建一个叶节点对象 osg::Geode* geode = new osg::Geode(); //创建一个几何体对象 osg::Geometry* geom = new osg::Geometry(); //创建顶点数组，注意顶点的添加顺序是逆时针的 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)); //设置顶点数据 geom->setVertexArray(v); //创建纹理坐标 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); //创建颜色数组 osg::Vec4Array* vc = new osg::Vec4Array(); //添加数据 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); //设置颜色的绑定方式为单个顶点 geom->setColorBinding(osg::Geometry::BIND_PER_VERTEX); //创建法线数组 osg::Vec3Array* nc = new osg::Vec3Array(); //添加法线 nc->push_back(osg::Vec3(0.0f,-1.0f,0.0f)); //设置法线数组 geom->setNormalArray(nc); //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)); //添加到叶节点 geode->addDrawable(geom); return geode; } int main() { //创建Viewer对象，场景浏览器 osgViewer::Viewer* viewer = new osgViewer::Viewer(); osg::Group* root = new osg::Group(); //添加到场景 root->addChild(createQuad()); //优化场景数据 osgUtil::Optimizer optimizer ; optimizer.optimize(root) ; viewer->setSceneData(root); viewer->realize(); viewer->run(); return 0 ; }