osg绘制3D字体

osg::ref_ptr<osgText::Text3D> xText3D = new osgText::Text3D();

xText3D->setFont("font/arial.ttf");
xText3D->setCharacterSize(30);
xText3D->setText("X");
xText3D->setPosition(osg::Vec3(x_axis_length+20.0f, 0.0f, 0.0f));
xText3D->setRotation(osg::Quat(0.0f, 0.0f, 0.0f, 1.0f));

xGeodeText->addChild(xText3D);