Calculating the perfect bounding sphere is an expensive operation. You need to calc the convex hull which is O(n log n). osg uses a fast approximation which is generally good enough.
2009/8/11 Gianluca Natale <[email protected]>: > Hi All, > I’m having problem computing the global bounding sphere of my model. > I debugged OSG (2.8.0) and discovered that the bounding sphere of a geode > (BoundingSphere Geode::computeBound()) is > computed as the bounding sphere of the bounding box that includes all its > drawables !?! > > > > Why that? > > Shouldn’t it be the global bounding sphere of the drawables, merging the > single bounding spheres > of all the drawables? > > > > So, a drawable that represents a sphere should have as bounding sphere > itself, > but this is not true with the computation OSG performs. It is larger than > strictly required. > > > > Thanks, > Gianluca Natale > > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > -- http://www.ssTk.co.uk _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
