drawing sphere optimization

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@35249 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
4.9.295.0

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@35250 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e