when i try to join selected vertices they shrink or disappear I added a lat miku torso to a normal miku model because I wanted to fix up the empty space when you delete part of the shirt. I don't know how to merge the vertices so that the shoulders of the added part move with the arms. this is what it looks like in a pose: fav.me/d7gzkmg as you can see the replaced torso's vertices arnt connected to the arms or the neck. I imported the body part into pmd editor as an accessory file so i didnt have to mess with bones or physics(it usually messes up my pmd editor if I remove all the bones and physics of an object and import it into the desired model as a pmd file. so I just save any parts I want to add as an accessory file) the torso looks so cool but those arms are driving me crazy!
Hmm... it appears to be a rigging problem. I think that the shoulders/ upper arms aren't rigged to the bones. As for the sleeves, it appears to be a rigging problem, too. These problems can be solved by weighting the polygons to the bones. Here is a tutorial on rigging: tehrainbowllama.deviantart.com… . (And if you only feel like rigging one side, you can mirror the rigging like this: tehrainbowllama.deviantart.com… ) I hope this helps!
i found out that fixing the neck was easy but i can't figure out how to rigg the shoulders properly. the one on the right is rigging sort of fine(some of the vertices under the arm stretch weird and make a deep hole in the armpit) but the other side looks all crazy when i try rigging it! I've even tried mirroring it but that didn't work ether. could u help me fix the riggs? I can upload the pmd file and a pose file so that you can see how the limbs bend.