Hi Vincent, Am 08.09.2011 08:51, schrieb Vincent Bourdier: > Hi all, > > I'm currently trying to compute an intersection between a sphere and a > node. > PolytopeIntersector seems to be the best choice according to the > documentation, but I didn't find any example of implementation.
Have a look at the osgkeyboardmouse example. > Next, are there some limitations to its usage ? (I saw something about > convex clipping volumes...) PolytopeIntersector is mostly useful when used for interactive picking with small volumes. Its return data structure is too big for large volumes (containing lots of intersections). > The goal is to compute if a point is at less than a fixed distance from > a node, and to my mind the intersection is the best way but maybe there > is something more adapted ? I think that should be possible. I would recommend using a cube which contains the distance-sphere as the polytope and check the results from the PolytopeIntersector for the real (euclidian) distance. I would advise against trying to use a "sphere"-polytope since the intersector must check all polytope-planes in the innermost loop. > Thanks for your help. > > Regards, > Vincent. Cheers, Peter -- Vorstand/Board of Management: Dr. Bernd Finkbeiner, Dr. Roland Niemeier, Dr. Arno Steitz, Dr. Ingrid Zech Vorsitzender des Aufsichtsrats/ Chairman of the Supervisory Board: Philippe Miltin Sitz/Registered Office: Tuebingen Registergericht/Registration Court: Stuttgart Registernummer/Commercial Register No.: HRB 382196 _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
