UPDATE: The initial question was: "How can i give collision on a custom mesh, created in Blender, now maybe I have the answer! Premise: Sorry for my bad bad English but I'm still studying it :) I initially started trying this procedure: I create the mesh on Blender, then I exported from it in .obj next I imported the .obj file in Outfit studio for convert the file .obj in file .nif but when I opened the file in nifskope, the file don't have collisions. Now I tryed to do this procedure: I create the mesh on Blender, then I opened Outfit Studio and I put a reference of an already existing file in the game (I took a knife) and I imported the file .obj then I exported it in .nif, it worked! :D I hope this can help you :)
