Added Sphere::merge utility method
Added Sphere::merge utility method

bhlzlx/ogre,ehsan/ogre,ehsan/ogre,ruleless/ogre,ehsan/ogre,ruleless/ogre,ruleless/ogre,ruleless/ogre,bhlzlx/ogre,bhlzlx/ogre,ehsan/ogre,ruleless/ogre,bhlzlx/ogre,bhlzlx/ogre,bhlzlx/ogre,ehsan/ogre,ruleless/ogre