Hello,
I have two question the first one about bounding box and the other one
about select object
The first one I would like to load model in node and draw bounding box for
this node, I have tried to write the code but doesn't work..
This is the code:
int main(int argc, char *argv[])
{
osg::ref_ptr<osg::Vec3Array> wireBoxPt;
osg::ref_ptr<osg::Vec3Array> wireBoxVert;
osg::ref_ptr<osg::StateSet> stateset;
osg::ref_ptr<osg::Geode> root;
osg::ref_ptr<osg::Geometry> lineGeom;
osg::ref_ptr<osg::Geode> lineGeode;
osg::ref_ptr<osg::Node> model1 = osgDB::readNodeFile( "cessna.osg");
osg::ref_ptr<osg::Node> model2 = osgDB::readNodeFile( "cow.osg" );
osg::ref_ptr<osg::Group> group = new osg::Group;
wireBoxPt= new osg::Vec3Array;
lineGeode= new osg::Geode;
lineGeom= new osg::Geometry;
wireBoxVert= new osg::Vec3Array;
float scale= 1.0;
wireBoxPt->push_back(osg::Vec3(-scale,-scale,-scale));
wireBoxPt->push_back(osg::Vec3(scale,-scale,-scale));
wireBoxPt->push_back(osg::Vec3(scale,scale,-scale));
wireBoxPt->push_back(osg::Vec3(-scale,scale,-scale));
wireBoxPt->push_back(osg::Vec3(-scale,-scale,scale));
wireBoxPt->push_back(osg::Vec3(scale,-scale,scale));
wireBoxPt->push_back(osg::Vec3(scale,scale,scale));
wireBoxPt->push_back(osg::Vec3(-scale,scale,scale));
wireBoxVert->push_back(wireBoxPt->at(0));
wireBoxVert->push_back(wireBoxPt->at(1));
wireBoxVert->push_back(wireBoxPt->at(1));
wireBoxVert->push_back(wireBoxPt->at(2));
wireBoxVert->push_back(wireBoxPt->at(2));
wireBoxVert->push_back(wireBoxPt->at(3));
wireBoxVert->push_back(wireBoxPt->at(3));
wireBoxVert->push_back(wireBoxPt->at(0));
wireBoxVert->push_back(wireBoxPt->at(0));
wireBoxVert->push_back(wireBoxPt->at(4));
wireBoxVert->push_back(wireBoxPt->at(1));
wireBoxVert->push_back(wireBoxPt->at(5));
wireBoxVert->push_back(wireBoxPt->at(2));
wireBoxVert->push_back(wireBoxPt->at(6));
wireBoxVert->push_back(wireBoxPt->at(3));
wireBoxVert->push_back(wireBoxPt->at(7));
wireBoxVert->push_back(wireBoxPt->at(4));
wireBoxVert->push_back(wireBoxPt->at(5));
wireBoxVert->push_back(wireBoxPt->at(5));
wireBoxVert->push_back(wireBoxPt->at(6));
wireBoxVert->push_back(wireBoxPt->at(6));
wireBoxVert->push_back(wireBoxPt->at(7));
wireBoxVert->push_back(wireBoxPt->at(7));
wireBoxVert->push_back(wireBoxPt->at(4));
lineGeom->setVertexArray(wireBoxVert);
lineGeom->setUseDisplayList(false);
lineGeom->addPrimitiveSet(new
osg::DrawArrays(GL_LINES,0,wireBoxVert->size()));
lineGeode->addDrawable(lineGeom);
group->addChild(lineGeode);
group->addChild( model1 );
group->addChild( model2 );
int index1;
index1=0;
osg::Geometry* geome =
group->getChild(index1)->asGeode()->getDrawable(0)->asGeometry();
osg::BoundingBox bb=geome->getBound();
wireBoxPt->at(0)=(osg::Vec3(bb.xMin(),bb.yMin(),bb.zMin()));
wireBoxPt->at(1)=(osg::Vec3(bb.xMax(),bb.yMin(),bb.zMin()));
wireBoxPt->at(2)=(osg::Vec3(bb.xMax(),bb.yMax(),bb.zMin()));
wireBoxPt->at(3)=(osg::Vec3(bb.xMin(),bb.yMax(),bb.zMin()));
wireBoxPt->at(4)=(osg::Vec3(bb.xMin(),bb.yMin(),bb.zMax()));
wireBoxPt->at(5)=(osg::Vec3(bb.xMax(),bb.yMin(),bb.zMax()));
wireBoxPt->at(6)=(osg::Vec3(bb.xMax(),bb.yMax(),bb.zMax()));
wireBoxPt->at(7)=(osg::Vec3(bb.xMin(),bb.yMax(),bb.zMax()));
wireBoxVert->at(0)=(wireBoxPt->at(0));
wireBoxVert->at(1)=(wireBoxPt->at(1));
wireBoxVert->at(2)=(wireBoxPt->at(1));
wireBoxVert->at(3)=(wireBoxPt->at(2));
wireBoxVert->at(4)=(wireBoxPt->at(2));
wireBoxVert->at(5)=(wireBoxPt->at(3));
wireBoxVert->at(6)=(wireBoxPt->at(3));
wireBoxVert->at(7)=(wireBoxPt->at(0));
wireBoxVert->at(8)=(wireBoxPt->at(0));
wireBoxVert->at(9)=(wireBoxPt->at(4));
wireBoxVert->at(10)=(wireBoxPt->at(1));
wireBoxVert->at(11)=(wireBoxPt->at(5));
wireBoxVert->at(12)=(wireBoxPt->at(2));
wireBoxVert->at(13)=(wireBoxPt->at(6));
wireBoxVert->at(14)=(wireBoxPt->at(3));
wireBoxVert->at(15)=(wireBoxPt->at(7));
wireBoxVert->at(16)=(wireBoxPt->at(4));
wireBoxVert->at(17)=(wireBoxPt->at(5));
wireBoxVert->at(18)=(wireBoxPt->at(5));
wireBoxVert->at(19)=(wireBoxPt->at(6));
wireBoxVert->at(20)=(wireBoxPt->at(6));
wireBoxVert->at(21)=(wireBoxPt->at(7));
wireBoxVert->at(22)=(wireBoxPt->at(7));
wireBoxVert->at(23)=(wireBoxPt->at(4));
wireBoxVert->dirty();
osg::ref_ptr<osgViewer::Viewer> viewer=new osgViewer::Viewer;
viewer->setUpViewInWindow(0, 0, 1000, 700);
viewer->setSceneData(group );
viewer->run();
}
_______________________________________________________________________________________________________________________
The second question about select object I have tried to use this code from
OSG beginner guide book...
#include <osgViewer/Viewer>
#include <osgDB/ReadFile>
#include <osg/Group>
#include <osg/MatrixTransform>
#include <osg/ShapeDrawable>
#include <osg/PolygonMode>
#include <osgUtil/LineSegmentIntersector>
class PickHandler : public osgGA::GUIEventHandler
{
public:
osg::Node* getOrCreateSelectionBox();
virtual bool handle( const osgGA::GUIEventAdapter&
ea,osgGA::GUIActionAdapter& aa );
protected: osg::ref_ptr<osg::MatrixTransform> _selectionBox;
};
osg::Node* PickHandler::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();
}
bool PickHandler::handle( const osgGA::GUIEventAdapter&
ea,osgGA::GUIActionAdapter& aa )
{
if ( ea.getEventType()!=osgGA::GUIEventAdapter::RELEASE ||
ea.getButton()!=osgGA::GUIEventAdapter::LEFT_MOUSE_BUTTON )
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() )
{
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;
}
int main(int, char **)
{
osg::ref_ptr<osg::Node> model1 = osgDB::readNodeFile( "cessna.osg");
osg::ref_ptr<osg::Node> model2 = osgDB::readNodeFile( "cow.osg" );
osg::ref_ptr<osg::Group> root = new osg::Group;
root->addChild( model1.get() );
root->addChild( model2.get() );
osg::ref_ptr<PickHandler> picker = new PickHandler;
root->addChild( picker->getOrCreateSelectionBox() );
osgViewer::Viewer viewer;
viewer.setSceneData( root.get() );
viewer.addEventHandler( picker.get() );
return viewer.run();
}
I would like to get the index number of the object that I selected
I have tried to use these lines with the previous code but it give me wrong
index number
osgUtil::LineSegmentIntersector::Intersection
result=*(intersector->getIntersections().begin());
bb = result.drawable->getBound();
int indexNode;
osg::ref_ptr<osg::Node> newnode = result.drawable->getParent(0);
indexNode= root->getChildIndex(newnode);
Best Regards,
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