True Reality (TR) is an open source LGPL Game and Simulation Engine written entirely in Standard C++ and OpenGL. It runs on all Windows platforms and GNU/Linux. OpenSceneGraph is used as its graphics engine, along with many other open source projects for support of various features.
Creates a system that will decimate the model mesh in real time on the fly and create lower level LODs according to pixel area.
Links:
https://wiki.jmonkeyengine.org/doku.php/jme3:advanced:level_of_detail https://github.com/worldforge/ember/tree/master/src/components/ogre/lod http://sajty.elementfx.com/progressivemesh/GSoC2012.pdf