HI Camile,
You simply need to walk back from of the end of the
Intersection::nodePath to the first group, of which ever one you wan
to use.
If you want to see an example of highlighitng picked items have a look
at the osgkeyboard mouse.
Cheers,
Robert.
On Mon, May 16, 2011 at 11:24 PM, camille matan <techma...@gmail.com> wrote:
> Hi,
> I want to select an object after a picking.
> I found how to do picking but i don't know how to get the group that
> corresponds to the picked zone.
> My scene is composed of simple shapes (shapedrawable, geodes and group).
> I want to get the first group in the hierarchy.
>
>
>
> Code:
>
> #ifndef _picking_h
> #define _picking_h
>
> #include <osg/MatrixTransform>
> #include <osg/ShapeDrawable>
> #include <osg/PolygonMode>
> #include <osgUtil/LineSegmentIntersector>
>
> #include "includer.h"
> #include "animation.h"
> #include "rotate.h"
> #include "dove.h"
>
>
> class PickHandler : public osgGA::GUIEventHandler
> {
> public:
> osg::Node* getOrCreateSelectionBox()
> {
> if ( !_selectionBox )
> {
> osg::ref_ptr<osg::Geode> geode = new osg::Geode;
> geode->addDrawable(new osg::ShapeDrawable(new
> osg::Box(osg::Vec3(), 1.0f)) );
>
> _selectionBox = new osg::MatrixTransform;
> _selectionBox->setNodeMask( 0x1 );
> _selectionBox->addChild( geode.get() );
>
> osg::StateSet* ss = _selectionBox->getOrCreateStateSet();
> ss->setMode( GL_LIGHTING, osg::StateAttribute::OFF );
> ss->setAttributeAndModes( new
> osg::PolygonMode(osg::PolygonMode::FRONT_AND_BACK, osg::PolygonMode::LINE) );
> }
> return _selectionBox.get();
> }
>
> 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::Viewer* viewer = dynamic_cast<osgViewer::Viewer*>(&aa);
> if ( viewer )
> {
> osg::ref_ptr<osgUtil::LineSegmentIntersector> intersector = new
> osgUtil::LineSegmentIntersector(osgUtil::Intersector::WINDOW, ea.getX(),
> ea.getY());
> osgUtil::IntersectionVisitor iv( intersector.get() );
> iv.setTraversalMask( ~0x1 );
> viewer->getCamera()->accept( iv );
>
> if ( intersector->containsIntersections() )
> {
> const osgUtil::LineSegmentIntersector::Intersection& result
> =*(intersector->getIntersections().begin());
> // const osgUtil::LineSegmentIntersector::Intersection&
> result =*(intersector->getIntersections().begin());
> osg::BoundingBox bb = result.drawable->getBound();
> osg::Vec3 worldCenter = bb.center() *
> osg::computeLocalToWorld(result.nodePath);
>
> _selectionBox->setMatrix(osg::Matrix::scale(bb.xMax()-bb.xMin(),
> bb.yMax()-bb.yMin(), bb.zMax()-bb.zMin()) *
> osg::Matrix::translate(worldCenter) );
> }
> }
> return false;
> }
>
> protected:
> osg::ref_ptr<osg::MatrixTransform> _selectionBox;
> };
>
> #endif
>
>
>
>
>
> i think that I do something like that :
> osg::Node = result.drawable->getParent();
> or
> osg::Nodepath = result.nodepath;
> but i want finally a osg::Group.
>
> Thank !!!!!
> Camille[/code]
>
> ------------------
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=39433#39433
>
>
>
>
>
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>
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