Hi,
I want to obtain the latitude, longitude and height when I click with the
mouse. Here is my code :
osgGA::GUIEventAdapter& ea;
osgUtil::LineSegmentIntersector::Intersections intersections;
std::string gdlist="";
float x = ea.getX();
float y = ea.getY();
osg::ref_ptr< osgUtil::LineSegmentIntersector > picker = new
osgUtil::LineSegmentIntersector(osgUtil::Intersector::WINDOW, x, y);
osgUtil::IntersectionVisitor iv(picker.get());
view->getCamera()->accept(iv);
if (picker->containsIntersections())
{
intersections = picker->getIntersections();
for(osgUtil::LineSegmentIntersector::Intersections::iterator hitr =
intersections.begin();
hitr != intersections.end();
++hitr)
{
std::ostringstream os;
if (!hitr->nodePath.empty() &&
!(hitr->nodePath.back()->getName().empty()))
{
// the geodes are identified by name.
os<<"Object
\""<<hitr->nodePath.back()->getName()<<"\""<<std::endl;
}
else if (hitr->drawable.valid())
{
os<<"Object
\""<<hitr->drawable->className()<<"\""<<std::endl;
}
osg::CoordinateSystemNode* csn = new osg::CoordinateSystemNode;
csn->setEllipsoidModel(new osg::EllipsoidModel());
csn->addChild(TerrainNode);
os<<" local coords vertex("<<
hitr->getLocalIntersectPoint()<<")"<<std::endl;
os<<" world coords vertex("<<
hitr->getWorldIntersectPoint()<<")"<<std::endl;
osg::Vec3 point = hitr->getWorldIntersectPoint();
double latitude;
double longitude;
double height;
csn->getEllipsoidModel()->convertXYZToLatLongHeight(point.x(),point.y(),point.z(),latitude,longitude,height);
latitude = osg::RadiansToDegrees(latitude);
longitude = osg::RadiansToDegrees(longitude);
os<<" lat,long,height("<< latitude << "," << longitude
<< "," << height << ")" <<std::endl;
gdlist += os.str();
}
}
This works well when I don't make a translation or rotation on the terrain.
But when I make a translation for example :
TerrainNode= osgDB::readNodeFile("geo.osg");
osg::ref_ptr<osg::Group> group = new osg::Group;
osg::ref_ptr<osg::MatrixTransform> mat = new osg::MatrixTransform;
group->addChild(mat);
mat->addChild(TerrainNode);
osg::Matrix trans;
trans.makeTranslate(osg::Vec3f(1000,5000,1500));
mat->preMult(trans);
the values of latitude, longitude and height are false and it's normal.
I would prefer to use local point "hitr->getLocalIntersectPoint()", which does
not change when I make a translation, to calculate the latitude, longitude and
height but I don't how to do this.
Can you help me?
Thank you!
Cheers,
lucie
------------------
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http://forum.openscenegraph.org/viewtopic.php?p=30174#30174
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