HI David, When the ray intersects a triangle it provides the three vertex indices and the associated ratios are the baricentric coordinates that you can use to compute the interoplate vertex, colour, tex coord etc. There isn't an sorting of the indices to report the nearest.
Robert. On Wed, Jun 22, 2011 at 5:19 PM, David Cofer <[email protected]> wrote: > Hi, > > I want to let my user pick individual vertices on a model. I used the osgPick > example code to get the picking of an object working great, but when I tried > to use the code to pick the vertex it is not really working correctly, and I > am not sure what I am doing wrong. Here is the code I am using: > > > Code: > > > //Get the selected vertex. > const osgUtil::LineSegmentIntersector::Intersection::IndexList& vil = > hitr->indexList; > osg::Geometry *osgGeom = dynamic_cast<osg::Geometry *>(hitr->drawable.get()); > > if(vil.size() > 0 && osgGeom) > { > osg::ref_ptr<osg::Vec3Array> aryVert = > dynamic_cast<osg::Vec3Array*>(osgGeom->getVertexArray()); > int iSelVert = vil[0]; > m_vSelectedVertex = (*aryVert)[iSelVert]; > } > else > m_vSelectedVertex.set(0, 0, 0); > > > > > I assumed that the index list that is returned back would be of the index of > vertices sorted by the closest vertex. When I tested this though it sometimes > gave me the same number even when I clicked different vertices. It was always > three numbers in the index list as well. Not sure why. Is there anyone out > there who can clear up exactly what the index list is returning to me, and > how I can use that to get the vertex that was clicked on? > > Thank you! > Cheers, > David[/code] > > ------------------ > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=40752#40752 > > > > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
