Could you please explain that a bit more? At the Moment it reads "hardcoded" like on other tree models made by blizzard, i checked also for Geosetanim again, still coudn't find it...
Textures with 512*512 as well as 256*256 makes no difference, still invisible with collission.
The problem is, the Model uses 2 Textures, and the Tutorials I found only deal with one Model with one texture. I can easily select the Trunk and the Branches in Blender (Both can be selected with a right click, no big deal).
When I write the Textures with M2Modder or 010 Editor, nothing changes
Sorry for having me walk through this, but could it be a problem with the assigning of the Textures to the Model Parts?

Good Afternoon I tried to port a Tree from TESV Skyrim to WoW, I managed to export it to Obj and then Convert it to M2, but the Model is invisible! Strangely enough, the Model has Collission (thats how I knew it was actually ingame), Textures are 1024*512 for the Trunk and 512*512 for the Branches.

I followed User amiroperator's Tutorial and use Blender 2.68, like he does in his Video... I also searched and tried Blender 2.6 with recommended Settings as well as Blender 2.69
Could anyone please tell me what causes this? Model works fine in Blender...