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I prepared descriptions on the photos: enter image description here enter image description here Vertices are assigned well: enter image description here

What I would like to achieve is to move whole arm with keeping constant distances between vertices.

I assigned only blue vertices, made minimum and maximum scale to 1. I tried to turn off deforming but arm didn't track bone then. I tried some other options but it was only random shots, I knew they shouldn't work.

File to download:

I solved this issue: enter image description here

These 4 vertexes was added to the previous (selected) bone and it made a problem! I removed them from selected bone and problem disappeared. I think I don't understand this system yet.

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You have to assign the vertices in the vertex group of that bone to adjust which vertices to be deformed by the bone, not a limit scale.

Do this, select the armature and SHFT+Select the mesh making sure that the mesh is the active object. Then go to edit mode, and on the right properties panel go to the vertex groups tab, and select the vertex group assigned to the bone of the character's arm. It should have the name of the bone.

Make sure no vertices are selected before selecting any vertex groups by pressing A once. Then select the vertex group for the bone.

The vertices assigned to that bone should appear. If some are showing up that you do not want to deform from that bone, deselect them.

After this, press CTRL+I to select inverse, and then press "Remove". This will then remove the vertices selected from that vertex group, so that they don't deform with that bone.

EDIT:

So I found the issue to be that you have an unnecessary bone in between the arm and the shoulder. By deleting this bone, the arm deforms properly.

enter image description here

Now the arm deforms properly:

enter image description here

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  • $\begingroup$ Thanks but I have written that vertices are assigned well. I edited my post and added screen with proof. $\endgroup$ – arrowman Sep 9 '20 at 21:53
  • $\begingroup$ If you are willing could you add the file? $\endgroup$ – Nate_Sycro27 Sep 9 '20 at 21:55
  • $\begingroup$ Ok, I added link to my google disc. It shouldn't disappear until Google is existing. $\endgroup$ – arrowman Sep 9 '20 at 22:01
  • $\begingroup$ Ok, I solved issue. This arm bone has correct vertices. But previous bone didn't! I contained also 4 selected (in my post in last screen) vertexes. I didn't moved this bone but it was interfered with arm vertexes in any not know way for me. Thanks for you advices, without them I wouldn't notice this. Maybe you could write my solution so I could make your post as answer? You can use my screenshot. Just write that previous bone is influencing this arm :-) $\endgroup$ – arrowman Sep 9 '20 at 22:12

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