先看示例图:
void createText3() { osg::ref_ptr<osg::Group> root = new osg::Group; osg::ref_ptr<osg::Node> cowNode = osgDB::readNodeFile("cow.osgt"); //获取节点包围盒 osg::ComputeBoundsVisitor boundVisitor; cowNode->accept(boundVisitor); osg::BoundingBox cowBox = boundVisitor.getBoundingBox(); osg::Vec3 cowCenter = cowBox.center(); root->addChild(cowNode); osg::ref_ptr<osg::Geode> geode = new osg::Geode; osg::ref_ptr<osgText::Text> text = new osgText::Text; text->setColor(osg::Vec4(1.0, 0.0, 1.0, 0.5));//设置字体颜色 text->setText(QStringLiteral("这是一头牛!").toStdWString().c_str()); text->setDrawMode(osgText::Text3D::TEXT | osgText::Text3D::BOUNDINGBOX); text->setAxisAlignment(osgText::TextBase::XZ_PLANE); text->setCharacterSize(3.0);//设置字体大小 text->setFont("fonts/simhei.ttf"); //获取字体的包围盒 osg::BoundingBox textBox = text->getBoundingBox(); osg::Vec3 pos; pos.set(cowBox.xMin() - ((textBox.xMax() - textBox.xMin())- (cowBox.xMax()- cowBox.xMin()))/2, 0.0, 10.0); text->setPosition(pos);//设置字体的位置 geode->addDrawable(text); root->addChild(geode); osg::ref_ptr<osgViewer::Viewer> viewer = new osgViewer::Viewer(); viewer->addEventHandler(new osgViewer::WindowSizeHandler()); viewer->addEventHandler(new osgViewer::StatsHandler()); viewer->setSceneData(root.get()); viewer->realize(); viewer->run(); }