Have been trying to help a mod author with LOD generation for their world space,http://www.nexusmods.com/skyrim/mods/59231/?but running into a few snags. I can generate the lod fine and all works but the trees that he is using are custom meshes with no LOD so they won't show at distance. I have the .nif files but I am inexperienced with creating any thing in Nifscope or any other graphic editor. If any one can point me in the right direction to a tutorial or something as how to add the lod to a mesh, that would be great. I have tried to create tree billboards using this http://www.nexusmods.com/skyrim/mods/60733/?tab=4&&navtag=http%3A%2F%2Fwww.nexusmods.com%2Fskyrim%2Fajax%2Fcomments%2F%3Fmod_id%3D60733%26page%3D1%26sort%3DDESC%26pid%3D0%26thread_id%3D2365989&pUp=1 but without success. It will generate the billboards, but they don't show in game.

Been pounding my head for about a week now to figure this out but to no avail.

Any help will be appreciated

Thanks in advance

EDIT; I should also add that Vanilla Trees used in the world space are showing LOD without problems, it is only the custom trees.