HI Chris, It really is hard to know what is going on with your usage as I don't know you data or the code that you are using with the OSG.
It could be a problem with the orientation of the planes of the Polytope - they are need to be consistent with all their normals pointing inwards. If you have just one plane's normal pointing outwards the test will fail, using a flip on the all the planes of the polytop will just reverse the problem so won't magically fix anything. Robert. On 12 March 2014 20:15, Chris Long <[email protected]> wrote: > Hi, > > I'm getting unexpected behavior from PolytopeIntersector and was wondering > if it might have something to do with the PagedLODs in my scene graph. > > I want to find all polygons in a rectilinear volume in my model, in model > coordinates (not related to any view on the screen) based on two corner > vertices. > > The weird thing is that if I use the two corner points as the ends of a > LineSegmentIntersector, I find intersections, but a PolytopeIntersector > with Polytope made from a BoundingBox with those same corner points, over > the same graph, finds no intersections. > > Shouldn't the PolytopeIntersector at least find the geometry that the > LineSegmentIntersector does? > > I thought I might have the direction of the planes backwards for the > Polytope, so I tried flip() but either way I get no intersections. > > I've read through the code and it looks like there might be issues related > to the PagedLODs in my scene graph. Any idea if PolytopeIntersector and > PagedLOD play together well or not? > > I've looked for examples and read code for PolytopeIntersector, but there > doesn't seem to be much out there, and most of it uses View-based > intersection, not model-based. > > Thank you! > > Cheers, > Chris > > ------------------ > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=58575#58575 > > > > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >
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