[osg-users] intersection tests

[Trajce Nikolov NICK]

Thanks Julien for your time to give it a look

I went further, debugging view->computeIntersections(). The osgpick is my
starting point and my code is only a mimic of what
osgViewer::View::computeIntersection is doing, using the IntersectionVisitor

A good sample for reproduction is to have some code (I will post it here
soon) that will load two models (terrain and building - can be the lz.osg
and the cow.osg from the dataset) place the model somewhere on the terrain
and rotate the root (the terrain) a bit, and use the osgpick sample. This
is fast that come to me minds now, although it might not work the same
since picking from the screen coords and picking in "world space" have
different CoordinateFrames for the LineSegmentIntersector used that is
managed differently

On Sat, Feb 18, 2017 at 9:33 PM, Julien Valentin <julienvalentin51 at gmail.com
> wrote:

> Hi nick
> At first glance, I don't see any problem with your code...
> If you just want to code a mousepicker
> osgViewer::View::computeIntersections(screenx,screeny,outintersections))
>  would fit your needs.
>
> Code:
> // class to handle events with a pick
> class PickHandler : public osgGA::GUIEventHandler
> {
> public:
> bool PickHandler::handle(const osgGA::GUIEventAdapter&
> ea,osgGA::GUIActionAdapter& aa)
> {
>     switch(ea.getEventType())
>     {
>     case(osgGA::GUIEventAdapter::DOUBLECLICK):
>     {
>         osgViewer::View* view = dynamic_cast<osgViewer::View*>(&aa);
>         if (view){
> osgUtil::LineSegmentIntersector::Intersections inter;
> if(view->computeIntersections(ea.getX(),ea.gety(),inter){
> ...blablabla...
> }
> }
> }
>
>
>
>
> Perhaps you should try it before debugging deeper
>
> Further, I would recommend the polytopeintersector for general purpose
> picking (it works for points primitives too)
>
> Hope it helps
>
>
> Cheers
>
>
>
> Trajce Nikolov NICK wrote:
> > It has to do with MatrixTransforms and probably the IntersectionVisitor.
> I had my scene rotated a bit and it was buggy. With identity matrix on top
> works well ... Trying to debug if I can find something
> >
> > On Thu, Feb 16, 2017 at 8:31 PM, Trajce Nikolov NICK < ()> wrote:
> >
> > > Hi Community,
> > >
> > > I am experiencing some bad results from various intersection tests. I
> have a database with buildings and for some reason the intersection tests
> are failing to get me the roofs of the buildings ...
> > >
> > >
> > > Here some snippets of my tries:
> > >
> > >
> > > http://pastebin.com/s7aZk8wA (http://pastebin.com/s7aZk8wA)
> > >
> > > http://pastebin.com/1s99SGZc (http://pastebin.com/1s99SGZc)
> > >
> > > http://pastebin.com/UtkqPRce (http://pastebin.com/UtkqPRce)
> > >
> > >
> > >
> > > What I am missing here?
> > >
> > >
> > > Thanks for every hint as always!
> > > Cheers!
> > >
> > > --
> > > trajce nikolov nick
> > >
> > >
> > >
> > >
> >
> >
> >
> >
> > --
> > trajce nikolov nick
> >
> >  ------------------
> > Post generated by Mail2Forum
>
>
> ------------------
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=70269#70269
>
>
>
>
>
> _______________________________________________
> osg-users mailing list
> osg-users at lists.openscenegraph.org
> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
>



-- 
trajce nikolov nick
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openscenegraph.org/pipermail/osg-users-openscenegraph.org/attachments/20170218/c98c08af/attachment-0003.htm>