Dear list members, could you please help me with the issue how to get the position of my object? I have developed a class, which is derived from the class "PositionAttitudeTransform" and this class encapsulates within its constructor some other classes/objects. These are namely "Switch" (to be able to set all children on or off), Geode, MatrixTransform and other. My intention is to have a sphere that can be dragged in 3 dimensions by the "TranslateAxisDragger" and to get its new position. So far so good, the visualization of the sphere and of the dragger is successful and I also can drag the sphere around, but I cannot get the new position. I try to get the position with this->getPosition(), where "this" is an object of PositionAttitudeTransform, the result is always zero. I guess the parent class, derived from PositionAttitudeTransform does not get to know the changes of its children. Can you tell me how can I achieve my goal? I thank you in advance. kind regards, Vitali Here is the code of the constructor: TargetSetter::TargetSetter(Rcs::RHCPrimitive *primitive) : osg::PositionAttitudeTransform() { // store the pointer to the RHCPrimitive class _primitive = primitive; //root = new osg::Group; _switch = new osg::Switch; addChild(_switch.get() ); // create a command manager cmdMgr = new osgManipulator::CommandManager; osg::ref_ptr<osg::Geode> geode_1 = new osg::Geode; osg::ref_ptr<osg::MatrixTransform> transform_1 = new osg::MatrixTransform; osg::ref_ptr<osg::TessellationHints> hints = new osg::TessellationHints; hints->setDetailRatio(2.0f); // draw a sphere osg::ref_ptr<osg::ShapeDrawable> shape; osg::Vec3 position; float radius = 0.01; arr vec= _primitive->computeX1(); // get the coordinates of the initial target (can consist of more than 3 elements) // assuming that the first 3 elements of the vector are x,y,z coordinates position[0] = vec(0); position[1] = vec(1); position[2] = vec(2); shape = new osg::ShapeDrawable(new osg::Sphere(position,radius), hints.get()); shape->setColor(osg::Vec4(0.8f, 0.8f, 0.4f, 1.0f)); geode_1->addDrawable(shape.get()); // draw info text beside the sphere CoordText = new osgText::Text; CoordText->setFont("fonts/times.ttf"); CoordText->setCharacterSize(radius*4); CoordText->setPosition(osg::Vec3(position[0]-radius*2,position[1],position[2])); CoordText->setAxisAlignment(osgText::Text::SCREEN); CoordText->setBackdropType(osgText::Text::OUTLINE); CoordText->setDrawMode(osgText::Text::TEXT | osgText::Text::BOUNDINGBOX); char buf[15]; sprintf(buf, "[%2.2f, %2.2f, %2.2f]",position[0],position[1],position[2]); CoordText->setText(buf); geode_1->addDrawable(CoordText); // material osg::ref_ptr<osg::Material> matirial = new osg::Material; matirial->setColorMode(osg::Material::DIFFUSE); matirial->setAmbient(osg::Material::FRONT_AND_BACK, osg::Vec4(0, 0, 0, 1)); matirial->setSpecular(osg::Material::FRONT_AND_BACK, osg::Vec4(1, 1, 1, 1)); matirial->setShininess(osg::Material::FRONT_AND_BACK, 64.0f); this->getOrCreateStateSet()->setAttributeAndModes(matirial.get(), osg::StateAttribute::ON); transform_1.get()->addChild(addDraggerToScene(geode_1.get(), cmdMgr.get() )); _switch->addChild(transform_1.get()); _switch->setAllChildrenOff(); // hide the target node _pickHandler = new TargetHandler(this); osg::Vec3d pos = this->getPosition(); std::cerr << "!!!!position: " << pos[0]<< " , " << pos[1] << " , " << pos[2] << std::endl; }
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