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I don't know why the vertices has changed. Although when I went out to look at the original edit mode. There was nothing wrong. This happens only in the right hand. Previously, I had weighted in the hip section. But when I check the weight of the hips, it has no effect on the hand. (pic 2) Please guide me how I can solve this problem. Thank you. enter image description here

enter image description here

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Then you set weight for a vertex, let say 100%, for 1 bone it doesn't mean that this vertex will move 100% with this bone. Not at all. One vertex may be in several groups at the same time, and the sum of all these weights may be more than 1. So the influence that bone has at the specific point equals its weight divided by the sum of all weights.

If you select a point, you may see something like this:

enter image description here

From this, you may find that other bones affects on this point.

And of-course, you may find useful to use auto-normalize option:

enter image description here

Which keeps the sum of weights always equal to 1.

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  • $\begingroup$ I can solve that problem. And to fix this problem in the future ,I have to right symbol auto normalize before start weight paint. Thank you very much. $\endgroup$
    – 3D Love
    Commented Aug 16, 2022 at 13:48

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