Hi, Some examples from the Cookbook (book by Rui Wang & Xuelei Qian) use this code snippet, given at page 39.
class PickHandler : public osgGA::GUIEventHandler { public: // This virtual method must be overrode by subclasses. virtual void doUserOperations( osgUtil::LineSegmentIntersector::Intersection& ) = 0; virtual bool handle( const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter& aa ) { if ( ea.getEventType()!=osgGA::GUIEventAdapter::RELEASE ||ea.getButton()!=osgGA::GUIEventAdapter::LEFT_MOUSE_BUTTON ||!(ea.getModKeyMask()&osgGA::GUIEventAdapter::MODKEY_CTRL) ) return false; osgViewer::View* viewer = dynamic_cast<osgViewer::View*>(&aa); if ( viewer ) { osg::ref_ptr<osgUtil::LineSegmentIntersector> intersector = new osgUtil::LineSegmentIntersector(osgUtil::Intersector::WINDOW, ea.getX(), ea.getY()); osgUtil::IntersectionVisitor iv( intersector.get() ); viewer->getCamera()->accept( iv ); if ( intersector->containsIntersections() ) { osgUtil::LineSegmentIntersector::Intersection& result = *(intersector->getIntersections().begin()); doUserOperations( result ); } } return false; } }; I couldn't compile examples 1 and 2 from chapter 2, and example 1 from chapter 5. I'm using Debian 10 and the latest version of OSG. My command to compile the last one is: $ g++ cook5.1.cpp -losg -losgAnimation -losgGA -losgUtil -losgViewer -o cook5.1 I get the following error message: cook5.1.cpp: In member function ‘virtual bool osgCookBook::PickHandler::handle(const osgGA::GUIEventAdapter&, osgGA::GUIActionAdapter&)’: cook5.1.cpp:72:62: error: binding reference of type ‘osgUtil::LineSegmentIntersector::Intersection&’ to ‘const osgUtil::LineSegmentIntersector::Intersection’ discards qualifiers osgUtil::LineSegmentIntersector::Intersection& result = *(intersector->getIntersections().begin()); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The message is the same in the previous examples. Anyone knows what's going on? Thanks, Rodrigo. -- You received this message because you are subscribed to the Google Groups "OpenSceneGraph Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to osg-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/osg-users/f0e93c54-f8aa-4651-bc11-1d22bc626343%40googlegroups.com.
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