Oh, Okay. Sorry, didnt look it up enough before answering. Problems with transforms was exactly what i thought would be a problem.
But, thank you! I will look in to polytypes more. On 6/26/06, Robert Osfield <[EMAIL PROTECTED]> wrote:
A polytope tells you wants inside or outside or bisecting. A BoundingBox is not a good choice to test against as it can get sheared by transforms in the scene graph, while a polytope can handle this just fine, so convert the bounding box into a polytope then do the testing. On 6/26/06, David Johansson <[EMAIL PROTECTED]> wrote: > Hi Robert, thanks for the reply! > > Well, its kindof what i want. As of now im working with picking > objects in the scenegraph. But eventually i want to be able to select > objects inside of an boundingbox. > Eg. user draws a box with the mouse, and selects all the objects inside it. > > I found a example of this at: > http://www.openscenegraph.org/osgwiki/pmwiki.php/Tasks/OsgIntersect > This is pretty much what i want to be done, find nodes/drawables > inside a boundingbox. > But, from what i can understand this code is nolonger developed or > maintained. And i didn't manage to get the examples running. > > If i understand correctly the Polytope suggestion you gave me would > only give me objects that are intersected. Wich means i wouldn't get > objects inside it(?). > > Since there are functions like: > /** Return true if this bounding box intersects the specified > bounding box. */ > bool intersects(const BoundingBox& bb) const > /** Returns true if this bounding box contains the specified > coordinate. */ > inline bool contains(const Vec3& v) const > > On the boundingbox it shouldn't be to hard to check if any objects > boundingbox is inside the "selected" boundingbox. > > I figured that there was a way to do this in a similar way as the > Linesegment & intersectVisitor does. > > MVH > David Johansson > > > > On 6/26/06, Robert Osfield <[EMAIL PROTECTED]> wrote: > > Hi David, > > > > Not quite sure what you are after, is that you want to use a polytope > > to intersect with a scene, rather than a line segmenet as > > IntersectVisitor does? > > > > There is a spealized code in src/osgSim/SphereSegmenet.cpp does create > > a osg::Polytope > > and traversing throught the scene picking out what elements intersect > > it. Perhaps this would be useful guide for you. > > > > BTW, a Polytope can be used to represent a bounding box, by building > > it from 6 half space planes. > > > > > > Robert. > > > > On 6/25/06, David Johansson <[EMAIL PROTECTED]> wrote: > > > Hi All! > > > > > > I have been looking for a while now, but have not found, a way to use > > > a BoundingBox and a IntersectVisitor. > > > > > > I'm not sure if it's currently implemeted, but instead of writing my > > > own functions i thought i might just ask. > > > As shown in some examples you can use a LineSegment and a > > > IntersectVisitor to find node's (geodes) that intersect with a given > > > line. Since i am using this to Select objects (sometimes very thin > > > lines) with a mouse this does pose a problem. As you need to click on > > > the exact pixel to select the object. > > > So, i was thinking that maybe you could use a BoundingBox instead, and > > > check if any object is inside. So, back to the question.. Is there a > > > way to do this allready implemeted into OSG? > > > > > > Thanks in advance! > > > > > > MVH > > > David Johansson > > > _______________________________________________ > > > osg-users mailing list > > > [email protected] > > > http://openscenegraph.net/mailman/listinfo/osg-users > > > http://www.openscenegraph.org/ > > > > > _______________________________________________ > > osg-users mailing list > > [email protected] > > http://openscenegraph.net/mailman/listinfo/osg-users > > http://www.openscenegraph.org/ > > > _______________________________________________ > osg-users mailing list > [email protected] > http://openscenegraph.net/mailman/listinfo/osg-users > http://www.openscenegraph.org/ > _______________________________________________ osg-users mailing list [email protected] http://openscenegraph.net/mailman/listinfo/osg-users http://www.openscenegraph.org/
_______________________________________________ osg-users mailing list [email protected] http://openscenegraph.net/mailman/listinfo/osg-users http://www.openscenegraph.org/
