[osg-users] Why does osg::AutoTransform node disappear when the scene is first created?

[mirr...@gmail.com]

   evn is win10&osg3.6.4 

   Why does osg::AutoTransform disappears after using the set 
setAutoRotateMode           method to be  true .  
    //
    std::string timesFont("fonts/arial.ttf");
    osgText::Text* text = new osgText::Text;
    text->setCharacterSize(characterSize);
    text->setText(message);
    text->setFont(timesFont);
    text->setAlignment(osgText::Text::CENTER_CENTER);

    osg::Geode* geode = new osg::Geode;
    geode->addDrawable(text);
    geode->getOrCreateStateSet()->setMode(GL_LIGHTING, 
osg::StateAttribute::OFF);

    osg::AutoTransform* at = new osg::AutoTransform;
    at->addChild(geode);

    at->setAutoRotateMode(osg::AutoTransform::ROTATE_TO_SCREEN);
    at->setAutoScaleToScreen(true);
    at->setMinimumScale(minScale);
    at->setMaximumScale(maxScale);
    at->setPosition(position);

[image: QQ图片20210308125825.jpg] 

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