Hi there @NixieLion
I don t know either why these topics merged together
For the T lod, imo has to do with terrain lod where lod stands for “level of distance” and
O lod, imo is object lod where lod stands for “load on distance”
On T lod the terrain is given more detail if you set it higher sharper edges on mountains for example
and when set lower these mountains get less detailed and more rounded edges (also effect photogrammetry imo)
O lod, the texture on for example buildings get loaded or blended in with less detail when set lower than 200 and depending distance and while closing in to the object more detail will be revealed.
So to me, these two topics have different approach but are often brought in ralationship with eachother.