Hi,
this is the new code:
Firstly, I used LineSegmentIntersector to find out the 3-D co-ordinates of
point data. This is working with solid bodies (sphere, pyramid etc) but it
doesn't intersect with point data.
Then i moved to PolytopeIntersector, it's working with the point data and
giving that how many objects are intersected and classname of objects but till
now i m unable to find out the method by which i can retrieve the 3-D
co-ordinates of the points.
The lines in red color giving the 3-D co-ordinates when I use
LineSegmentIntersector, but these method are not working with
PolyTopeIntersector.
class PickHandler : public osgGA::GUIEventHandler
{
protected:
float _mX, _mY;
void pick( const osgGA::GUIEventAdapter& ea, osgViewer::Viewer*
viewer);
public:
PickHandler() : _mX( 0. ),_mY( 0. ) {}
bool handle( const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter&
aa );
};
void PickHandler :: pick( const osgGA::GUIEventAdapter& ea, osgViewer::Viewer*
viewer )
{
float x, y, w, h;
x = ea.getX();
y = ea.getY();
if (!viewer->getSceneData())
// Nothing to pick.
osg::notify(osg::NOTICE)<<std::endl;
w = h = 0.5;
osgUtil::PolytopeIntersector::Intersections intersections;
osg::ref_ptr<osgUtil::PolytopeIntersector> picker = new
osgUtil::PolytopeIntersector(osgUtil::Intersector::WINDOW, x-w, y-h, x+w, y+h );
osgUtil::IntersectionVisitor iv( picker );
viewer->getCamera() -> accept( iv );
if (picker->containsIntersections())
{
intersections = picker->getIntersections();
for(osgUtil::PolytopeIntersector::Intersections::iterator hitr
= intersections.begin(); hitr != intersections.end(); ++hitr)
{
if (!hitr->nodePath.empty() &&
!(hitr->nodePath.back()->getName().empty()))
{
// the geodes are identified by name.
cout<<"Object
\""<<hitr->nodePath.back()->getName()<<"\""<<std::endl;
}
else if (hitr->drawable.valid())
{
cout<<"Object
\""<<hitr->drawable->className()<<"\""<<std::endl;
}
//std::cout<<" local coords vertex("<<
hitr->getLocalIntersectPoint() <<")"<<std::endl;
//std::cout<<" world coords vertex("<<
hitr->getWorldIntersectPoint()<<")"<<std::endl;
//
}
}
else
cout<<"doesn't contain intersection ";
}
bool PickHandler :: handle( const osgGA::GUIEventAdapter& ea,
osgGA::GUIActionAdapter& aa )
{
osgViewer::Viewer* viewer = dynamic_cast<osgViewer::Viewer*>( &aa );
if (!viewer)
return false;
switch( ea.getEventType() )
{
case osgGA::GUIEventAdapter::PUSH:
{
// Record mouse location for the button press
// and move events.
_mX = ea.getX();
_mY = ea.getY();
cout<<"position of mouse :"<<_mX<<","<<_mY<<endl;
if (viewer)
pick(ea, viewer);
return false;
}
case(osgGA::GUIEventAdapter::KEYDOWN):
{
if (ea.getKey()=='a')
{
cout<<"a pressed"<<endl;
return false;
}
default:
return false;
}
}
}
Thank you!
Cheers,
Vipin
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=30615#30615
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