[Valmont]

Tons of options. It is not clear to me what you exactly want, but here is a starter. You should think hard about the responsibilities of class CTerrainNodes. That will provide the right method.

public:
   scene::ITerrainSceneNode* get_terrain();

scene::ITerrainSceneNode* CTerrainNodes::get_terrain()
{
   return terrain;
}