Hi,
I am trying to pick a primitive from my osg scene using the
PolytopeIntersector. I am able to select my full geode but do not recieve the
primitive index. I attached the sample code I use for picking.
The polygons in the scene consists of osg::Geometry where each polytope
consists of osg::Vec3Array.
If I forgot to mention something please feel free to ask ;)
Thank you!
Cheers,
Code:
osgUtil::PolytopeIntersector* picker;
if (_useWindowCoordinates)
{
// use window coordinates
// remap the mouse x,y into viewport coordinates.
osg::Viewport* viewport = viewer->getCamera()->getViewport();
double mx = viewport->x() + (int)((double
)viewport->width()*(ea.getXnormalized()*0.5+0.5));
double my = viewport->y() + (int)((double
)viewport->height()*(ea.getYnormalized()*0.5+0.5));
// half width, height.
double w = 5.0f;
double h = 5.0f;
picker = new osgUtil::PolytopeIntersector(
osgUtil::Intersector::WINDOW, mx-w, my-h, mx+w, my+h );
} else {
double mx = ea.getXnormalized();
double my = ea.getYnormalized();
double w = 0.05;
double h = 0.05;
picker = new osgUtil::PolytopeIntersector(
osgUtil::Intersector::PROJECTION, mx-w, my-h, mx+w, my+h );
}
osgUtil::IntersectionVisitor iv(picker);
viewer->getCamera()->accept(iv);
if (picker->containsIntersections())
{
osgUtil::PolytopeIntersector::Intersection intersection =
picker->getFirstIntersection();
osg::notify(osg::NOTICE)<<"Picked
"<<intersection.localIntersectionPoint<<std::endl
<<" Distance to ref. plane "<<intersection.distance
<<", max. dist "<<intersection.maxDistance
<<", primitive index "<<intersection.primitiveIndex
<<", numIntersectionPoints "
<<intersection.numIntersectionPoints
<<std::endl;
osg::NodePath& nodePath = intersection.nodePath;
node = (nodePath.size()>=1)?nodePath[nodePath.size()-1]:0;
parent =
(nodePath.size()>=2)?dynamic_cast<osg::Group*>(nodePath[nodePath.size()-2]):0;
if (node) std::cout<<" Hits "<<node->className()<<" nodePath
size "<<nodePath.size()<<std::endl;
toggleScribe(parent, node);
}
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=55506#55506
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