Hi Harold, The most likely issue is that you are running the view multi-threaded, but not setting the DataVariance on the Text field to DYNAMIC - do this and you'll prevent the next frame from advancing before it's finished rendering the dynamically updated parts of the scene.
Robert. On Fri, Nov 20, 2009 at 9:43 AM, Harold Comere <[email protected]> wrote: > Hi all, > > I am currently experiencing some issues to update often the text of an > osgText::Text. I m working with osg 2.8.1. > > While draging the mouse i need to update the text of an osgText, so this > update is called very often. > So i have done a class inherating of osg::Drawable::DrawCallback, wich i > attach to my osgText::Text as an update callback : > And in the following code ClassC is a class inherating of osg::Geode and > containing the osgText. > > When the mouse is draging i set a flag _needUpdate of my ClassC class to > true, then text is updated in the callback if needed. > > class TextDrawCallback : public virtual osg::Drawable::DrawCallback > { > private: > osg::ref_ptr <ClassC> _myElement; > > public: > TextDrawCallback ( ClassC * element ) : _myElement ( element ) { } > > virtual void drawImplementation ( osg::RenderInfo& renderInfo, const > osg::Drawable * drawable ) const > { > // if the flag is to true > if ( _myElement->getNeedUpdate() ) > { > std::string newValue = anything computed > _myElement->getOsgText()->setText( newValue ); > _myElement->setNeedUpdate( false ); // no need update > anymore > } > > drawable->drawImplementation ( renderInfo ); > } > }; > > This works well under linux but make sometimes crashes under windows XP. The > crash appear in the code called by > drawable->drawImplementation ( renderInfo ); > but i cant find out the main reason. > > Did i something wrong with this callback ? > > Thanks for your attention. > Regards, > Harold > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
