Hi Martin, You'll need to dig into the LineSegmentIntersector code to answer this question.
Robert. 2009/6/22 Großer Martin <[email protected]>: > Hello Robert, > > now, I use the osgUtil::IntersectionVisitor. The example was very helpfully. > But I have a new little problem. I get the first intersection: > > const osgUtil::LineSegmentIntersector::Intersection hit = > _ray->getFirstIntersection(); > > After this, I get the intersection point in world coordinates: > > osg::Vec3 intersectionPoint = hit.getWorldIntersectPoint(); > > This vector is right. But the index list and the ratio list are empty. > > // get the vertex indices. > const osgUtil::LineSegmentIntersector::Intersection::IndexList& indices = > hit.indexList; > // bary coords > const osgUtil::LineSegmentIntersector::Intersection::RatioList& ratios = > hit.ratioList; > if (indices.size()==3 && ratios.size()==3) // is always false > { > // TO DO > } > > What is my mistake? Have you an idea? > > Cheers, > > Martin > > > > Am Freitag, den 19.06.2009, 15:18 +0100 schrieb Robert Osfield: > > Hi Martin, > > I would recommend using the osgUtil::IntersectionVisitor rather than > the osgUtil::IntersectVisitor as the later is deprecated and only kept > around for backwards compatibility. > > As for examples of getting the texture coords of a ray intersections > have a look at the osgViewer::InteractiveImageHandler implementation > in src/osgViewer/ViewerEventHandlers.cpp as it does just this. > > Robert. > > 2009/6/19 Großer Martin <[email protected]>: >> Hello all, >> >> i use the intersectVisitor to get the intersection between a ray and a >> geode. It works fine and I'm very happy, because it is very comfortable. >> Now I have the point (vector) of intersection, but I need the triangle >> of the drawable what I hit. I would like calculate the barycentric >> coordinates of the point. With this coordinates I want to calculate the >> texture coordinates of my intersection point. >> >> There are a comfortable way in osg? Or have anyone a idea for a nice >> solution? I think the intersectVisitor find the triangle, but i can't >> get this information. >> >> >> Cheers >> >> Martin >> >> _______________________________________________ >> 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 > > _______________________________________________ > 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
