Thank you very much Peter.
Peter Hrenka wrote: > Hi Maxime, > > The plane uses the above plane equation. > (If you are familiar with projective spaces, the Vec4 can be seen > as the projective normal in homogenous coordinates: > (a,b,c,d) dot (x,y,z,w) = 0, where w=1 for affine points ) > > Note the the representation is only unique up to a > factor (you can always multiply the equation with a > factor != 0.0) > > The normal is given implicitly by the representation. Given the above > equation, the normal is (a,b,c). You can easily change the direction > of the plane normal unsing its flip()-method. > Ok ! Peter Hrenka wrote: > > No problem at all. PolytopeIntersector uses open polytopes internally > when the geometry lies to one side of a plane. > Great Peter Hrenka wrote: > > You call the method accept(osg::NodeVisitor&) of your model (which is a > osg::Node). > See the example osgkeyboardmouse. > My bad, I should have seen it. Peter Hrenka wrote: > > This exercise is about polygons not polytopes! > Yes, I meant "testing this way for each primitive". Peter Hrenka wrote: > > As for the PolytopeIntersector: It will give you all points, > lines, triangles and quads which truly intersect the polytope volume, > given by the primitive index. > Sorry, I'm not sure I really understand. It is possible to get the intersected triangle instead of just a list of intersections coordinates? Peter Hrenka wrote: > > > 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: > Michel Lepert > Sitz/Registered Office: Tuebingen > Registergericht/Registration Court: Stuttgart > Registernummer/Commercial Register No.: HRB 382196 > thanks again, Max ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=14090#14090 _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
