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hi I'm trying to rig my character but i am having this annoying issue when i rig the shoulders and arms! when i move the arm up the mesh shirnks way too much. i tried to wheight paint but if i add wheight the deltoid goes down, if i remove weight it just dont deform am i missing something? btw i am using old version of blender because my onboard video doesnt support open gl

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    $\begingroup$ Hello please share your file $\endgroup$
    – moonboots
    Jan 30, 2023 at 14:57
  • $\begingroup$ ...and also you should mention which blender version you are using... $\endgroup$
    – Chris
    Jan 30, 2023 at 15:23

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This appears to be a simple weight painting error combined with a joint misplacement.

  1. The top of the shoulder is not weighted with the arm, so it digs into it like a rigid shoulder plate armor piece. I suggest trying automatic weights. But first consider,
  2. The joint for the shoulder appears to be too far out from the body, but it’s hard to tell without a screenshot showing the relaxed armature. I suggest editing the armature so that joint is closer to the body, probably coplanar with the side.
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