Hi guys, I'm having some difficulties with a polytope intersector. My scene uses polygons, lines and points, so I decided to use a polytope intersector to find which object the user wants to select. Here is my code :
Code: osg::ref_ptr<osg::Viewport> viewport = camera->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)); double w = SELECTION_SENSITIVITY; double h = SELECTION_SENSITIVITY; osg::ref_ptr<osgUtil::PolytopeIntersector> picker = new osgUtil::PolytopeIntersector( osgUtil::Intersector::WINDOW, mx-w, my-h, mx+w, my+h ); Then I look into the picker and retrieve the selected object and the exact coordinates of the click. This works just fine when I only need to find out which object was clicked, but the coordinates of the intersection with a polygon are not the exact coordinates of the click. It's actually the coordinates of the ray starting at the bottom left corner of the polytope. I'm not sure of how the polytopeIntersector works but I guess it's only because this ray is the first to be tested and to intersect an object of the scene. I tried to reduce my SELECTION_SENSITIVITY constant, but then, it's much harder to select a line or a point. What could I do to get the coordinates of the intersection with the ray that is the closest to the center of the polytope ? Should I use another kind of intersector ? Sorry if I wasn't clear enough. Ask me if you want more details. Thank you ! Bob ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=48958#48958 _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
