Like ALL scene graphs out there the OSG uses an approximation ( for Scenegraph performance reasons) to produce a bounding sphere that is ensured to encompass all its children but not necessarily tightly, and this is fine for 99% of bounding sphere usage in a scene graph If you want a tight and much more accurate bound sphere and or bounding box then you will need to calculate this your self
Gordon Product Manager 3d __________________________________________________________ Gordon Tomlinson Email : gtomlinson @ overwatch.textron.com __________________________________________________________ ________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of Gianluca Natale Sent: Tuesday, August 11, 2009 4:32 AM To: Osg Users Subject: [osg-users] about the bounding sphere of a geode computed by OSG 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
