Hi Teodor, Am 29.02.2012 15:56, schrieb Teodor Hanchevici: > Hi, > > I have trouble getting all the points that are contained in a polytope. I > have 5 points and their coordinates are: > > [...] > > A couple of questions: > 1. When constructing a polytope from a list of planes, do I have to take care > of the normal of the plane? The documentation says "When adding planes, their > normals should point inwards (into the volume)", does this apply to void > osg::Polytope::add(const osg::Plane & pl) method only?
The normal direction is very important. In fact, you get a different polytope when one normal direction is flipped: Think of a cube and add another plane which intersects all 6 planes. Obviously the cube is split into 2 polytopes and only the normal direction determines which one you want. I have not checked your example but you can easily find out which plane is wrongly oriented by calling Plane::distance on your points and checking if the values of that function-call are positive or negative. > 2. Is there a better method of achieving this? No, you have to get your normals right. > Thank you! > > Cheers, > Teodor Cheers, Peter -- Vorstand/Board of Management: Dr. Bernd Finkbeiner, Michael Heinrichs, 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 [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
