> I haven't looked at the code specifically, but I think this
> is the assumption which turns out to be false. The Drawables
> have bounding boxes, and then the Geodes containing them have
> bounding spheres which are built to encompass the Drawables'
> bounding boxes. Hence, the Geode's bounding sphere will be
> larger than the original sphere because it has to encompass
> the sphere's bounding box, which has to encompass the sphere itself.
J-S is right here. But, there is a ShapeVisitor class and a
ConstShapeVisitor class that you can use to create a more accurate bounding
sphere, as in the code below... (Coding this off the top of my head, so
forgive typos, thanks.)
-Paul
class SphereBoundVisitor : public osg::ConstShapeVisitor
{
public:
SphereBoundVisitor() {}
virtual ~SphereBoundVisitor() {}
virtual void apply( const osg::Shape& s )
{
osg::notify( osg::WARN ) << "Unknown shape." << std::endl;
}
virtual void apply( const osg::Sphere& s )
{
osg::notify( osg::INFO ) << "Found Sphere." << std::endl;
osg::Vec3 c = s.getCenter();
float radius = s.getRadius();
_bs = osg::BoundingSphere( c, r );
}
osg::BoundingSphere _bs;
};
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