articles, October 2000. Available at https://www.flipcode.com/archives/Fast_Terrain_Rendering_Using_Geometrical_MipMapping.shtml. Carl Erikson's paper at http://www.cs.unc.edu/Research/ProjectSummaries/hlods.pdf provides a quick, yet effective overlook at HLOD mechanisms. A more involved description follows in his thesis, at https://wwwx.cs.unc.edu/~geom/papers/documents/dissertations/erikson00.pdf. 3D rendering