/// \defgroup PkgThreeRef Three Reference
/// 
/*!
\addtogroup PkgThreeRef

\cgalPkgDescriptionBegin{Three,PkgThree}
\cgalPkgPicture{pkg-small.png}
\cgalPkgSummaryBegin
\cgalPkgAuthors{Laurent Rineau, Sebastien Loriot, Andreas Fabri, Maxime Gimeno}
\cgalPkgDesc{This package provides base classes for building a plugin. }
\cgalPkgManuals{Chapter_Three,PkgThreeRef}
\cgalPkgSummaryEnd
\cgalPkgShortInfoBegin
\cgalPkgSince{4.8}
\cgalPkgBib{cgal:rlfg-pd}
\cgalPkgLicense{\ref licensesGPL "GPL"}
\cgalPkgShortInfoEnd
\cgalPkgDescriptionEnd

\cgalClassifedRefPages
\cgalCRPSection{Interfaces}
- `CGAL::Three::Viewer_interface`
- `CGAL::Three::Scene_interface`
- `CGAL::Three::Polyhedron_demo_plugin_interface`
- `CGAL::Three::Polyhedron_demo_io_plugin_interface`

\cgalCRPSection{Classes}
-  `TextRenderer`
-  `TextItem`
-  `TextListItem`
-  `CGAL::Three::Scene_item`
-  `CGAL::Three::Scene_group_item`
*/
