557     QPushButton* but = new QPushButton("reset");  in createNavigationControlWidget()  local
558     but->setToolTip("move the camera to initial position (with animation)");  in createNavigationControlWidget()
559     layout->addWidget(but);  in createNavigationControlWidget()
560     connect(but, SIGNAL(clicked()), this, SLOT(resetCamera()));  in createNavigationControlWidget()
567     QRadioButton* but;  in createNavigationControlWidget()  local
568     but = new QRadioButton("turn around");  in createNavigationControlWidget()
569     but->setToolTip("look around an object");  in createNavigationControlWidget()
570     group->addButton(but, NavTurnAround);  in createNavigationControlWidget()
571     boxLayout->addWidget(but);  in createNavigationControlWidget()
572     but = new QRadioButton("fly");  in createNavigationControlWidget()
573 …but->setToolTip("free navigation like a spaceship\n(this mode can also be enabled pressing the \"s…  in createNavigationControlWidget()
574     group->addButton(but, NavFly);  in createNavigationControlWidget()
575     boxLayout->addWidget(but);  in createNavigationControlWidget()
586     QRadioButton* but;  in createNavigationControlWidget()  local
587     but = new QRadioButton("stable trackball");  in createNavigationControlWidget()
588     group->addButton(but, RotationStable);  in createNavigationControlWidget()
589     boxLayout->addWidget(but);  in createNavigationControlWidget()
590 …but->setToolTip("use the stable trackball implementation mapping\nthe 2D coordinates to 3D points …  in createNavigationControlWidget()
591     but = new QRadioButton("standard rotation");  in createNavigationControlWidget()
592     group->addButton(but, RotationStandard);  in createNavigationControlWidget()
593     boxLayout->addWidget(but);  in createNavigationControlWidget()
594 …but->setToolTip("standard approach mapping the x and y displacements\nas rotations around the came…  in createNavigationControlWidget()
605     QRadioButton* but;  in createNavigationControlWidget()  local
606     but = new QRadioButton("quaternion slerp");  in createNavigationControlWidget()
607     group->addButton(but, LerpQuaternion);  in createNavigationControlWidget()
608     boxLayout->addWidget(but);  in createNavigationControlWidget()
609     but->setToolTip("use quaternion spherical interpolation\nto interpolate orientations");  in createNavigationControlWidget()
610     but = new QRadioButton("euler angles");  in createNavigationControlWidget()
611     group->addButton(but, LerpEulerAngles);  in createNavigationControlWidget()
612     boxLayout->addWidget(but);  in createNavigationControlWidget()
613     but->setToolTip("use Euler angles to interpolate orientations");  in createNavigationControlWidget()