Speedtree Library Free Download -
A proper library needs LOD0 (high detail), LOD1 (medium), and LOD2 (billboard). You can generate these automatically in SpeedTree Modeler or Unreal.
Are you making a snowy forest, a jungle, or a savanna? speedtree library free download
Search for "Free SpeedTree Pine" + "OBJ" + "Royalty Free." A proper library needs LOD0 (high detail), LOD1