OpenSceneGraph VS Ogre 3D

I started in 2001 with OpenSceneGraph which made extensive use of intrusive pointers. This was 10 years before C++11 note. That codebase continues to be relevant and as performing as ever.

I have been using OpenSceneGraph for over 20 years. It is used in the military a lot and I myself have seen it used to simulate war scenarios with realtime data aboard of a command-and-control center of a battleship.

Does http://www.openscenegraph.org/ fit?

Speed Dreams: It is a fork of TORCS, and was born as the need to include many more functions to the latter. In Speed Dreams the menus would be completely redesigned, adding many more options and making them much more intuitive; the game acquired dynamic time, improvements in reflections, career mode, a new simulation mode and multi threading. Over time many more options were implemented, such as local multiplayer mode, Force Feedback, and of course more and better cars and tracks, a new and more powerfull graphic engine (OpenSceneGraph) among other things, making it a much more complete game than its predecessor. They recently they have presented version 2.2.3. You can also install it in AppImage and Flatpak format.

openscenegraph (mainly focuses on graphics, used by openmw for example)

I love Godot for a complete game engine. For just the renderer you could consider http://www.openscenegraph.org

-Finish the implementation of the new OpenSceneGraph rendering engine: The game allows to replace the default renderer (ssggraph) with OpenSceneGraph, but it still needs to implement many features to be completed, as well as further optimisation.

Ogre Sample Browser (version 13.2.4): Object-Oriented Graphics Rendering Engine - Samples