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]
------------------
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http://forum.openscenegraph.org/viewtopic.php?p=39433#39433
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