I thought id learn to make new hairstyles. To get myself started, rather than go through the entire process of creating a hairstyle I would edit an existing one from apachii hairstyles in max, (and by edit, i mean just move a few vertices around export a slightly different looking model), just to see if i can complete the process simply. However after exporting, creating the tri file and then replacing the old files with my new ones (in this case 'hair49.nif' and 'hair49.tri' I get a strange problem when loading up the game. It seems that wherever there is shadow my edited hair mesh appears semi transparent. replacing the old files removes the transparency so it is something within my files that is causing the problem. This image shows the problem: As you can see, it is not fully transparent, but you can see the shape of the body, head and ears though the hair. I emphasize that this only looks this way where there are cast shadows. Does anybody have any idea what is happening, or what I might be doing wrong? Thanks