Hi Christain, On Tue, Mar 10, 2009 at 2:25 PM, Christian Sam <[email protected]> wrote: > as far as i understand every Drawable object in the scenegraph does have a > "_boundingBox" data member. > > * does the user have to manually initalize this boundingBox (with a call like > "myDrawableOject.computeBound()"), or has it already been set by osg to > nodes' geometry extent (xmin, xmax, ymin, ymax, zmin, zmax)?
The BoundingBox is computed automatically when the dirtyBound flag is set, if you modify the geometry then you should call drawable->dirtyBound() to force an update. > * if the user wants to query, if a ceratin vec3 position lies inside a > Drawable object, can this be done with something like: > "myDrawableObject.getBound().contains(osg::Vec3f(...))"? Yes, this is what the contains(Vec3) method is for ;-) > * if the user has a non-rectangluar polygon (e.g. an area in form of > pentagram), will the above also work? if not, can you give me a hint how to > implement an adequate contains()-query? Well there isn't a BoundingBox::contains(anyShape) method so the answer has to be no. You'll need to build your own test. Robert. _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
