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This question already has an answer here:

I'm very new to Blender and I made a guy made out of blocks for a Game I'm working on in Unity. I made the armature and made it Parent with automated weights, now my Problem: When I for example move my right arm, it deforms the right side of my torso like it's glued to the arm, I dont know what to do please help. enter image description here

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marked as duplicate by Matt, David May 26 '16 at 22:13

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You need to modify the weights of the side torso. Select the mesh, hit Ctrl+Tab and get into Weight painting mode. For more information about weight-painting, please see:https://www.blender.org/manual/painting_sculpting/painting/weight_paint/introduction.html#weight-paint-in-a-nutshell

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  • $\begingroup$ I just made it all red for test and it is still the exact same result, is that normal? dropbox.com/s/ytrnmh72r8caf9e/Model_for_everything.blend?dl=0 here is my blender file $\endgroup$ – Deonisos69 Mar 27 '16 at 18:53
  • $\begingroup$ Yep, checked the file -- you need to Weight Paint the Torso so that all the vertex group is weighted to your torso bones. $\endgroup$ – Mike Belanger Mar 27 '16 at 19:03
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There are only two reasons that a vertex doesn't follow the bone as you expect it to.

  • It is not weighted to that bone
  • It is also weighted to another bone.

Not only do you need to make sure that the vertices for your torso are assigned to your torso bone, but you also need to make sure that those vertices are not assigned to any other bones.

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