[osg-users] Bug? Unable to pick osgSim::SphereSegment

Robert Osfield robert.osfield at gmail.com
Wed Sep 10 02:31:12 PDT 2008


Hi Morné,

I've never done intersection testing against SphereSegment's before,
so don't have first hand experience to throw at the problem.  My best
guess at the lack of results is that the internal Drawable
implementation used in SphereSegmenet isn't implement the
Drawable::accept(PrimitiveFunctor&) method which is the method that
the intersection code used to inquire about geometry data.  If this is
the case then one will need to implement this method as per the other
Drawable subclasses.

Robert.

On Wed, Sep 10, 2008 at 10:20 AM, Morné Pistorius
<mpistorius.osg at googlemail.com> wrote:
> Hi all,
>
> I seem to be unable to pick a osgSim::SphereSegment using a
> LineSegmentIntersector.  I have many other models in my scene as well that
> all work fine with the picker, including loaded models and manually
> assembled geometries.  It is just the SphereSegment that doesn't respond.
>  When I click on it, picker->containsIntersections() always returns false:
>
>   osgUtil::LineSegmentIntersector* picker;
>   picker = new osgUtil::LineSegmentIntersector(
> osgUtil::Intersector::PROJECTION, ea.getXnormalized(),ea.getYnormalized() );
>
>   osgUtil::IntersectionVisitor iv( picker );
>   viewer->getCamera()->accept( iv );
>   if ( picker->containsIntersections() )   <<<<------ ALWAYS FALSE
>   {
>     osgUtil::LineSegmentIntersector::Intersection intersection =
> picker->getFirstIntersection();
>     osg::NodePath& nodePath = intersection.nodePath;
>     node = ( nodePath.size() >= 1 )? nodePath[ nodePath.size() - 1 ] : NULL;
>   }
>
> I will investigate this further, but I was hoping someone might have some
> insights as to where to look for what goes wrong.  Is this a bug or is it
> something specific to SphereSegments?  (I am using OSG v2.2)
>
> Thanks!
> Morne
> _______________________________________________
> osg-users mailing list
> osg-users at lists.openscenegraph.org
> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
>
>



More information about the osg-users mailing list