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After parenting an armature with my mesh (using automatic weight), a part of it deforms when an unrelated bone moves even though that part of the mesh is not weight painted (its completely blue).

What could be the reason for this?

I have successfully rigged many models created by other people with no problems so maybe something is wrong with my model.

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  • $\begingroup$ If Weight Painting doesn't work, you can make some corrections with the Vertex Groups assignments $\endgroup$
    – moonboots
    Nov 8, 2018 at 13:19
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    $\begingroup$ Possible duplicate of (Rigging) Why are some of my vertex groups affecting blue areas? $\endgroup$
    – Sazerac
    Nov 9, 2018 at 1:05
  • $\begingroup$ please next time use the question's editor image tool as it embeds images in a permanent way, thanks. $\endgroup$
    – m.ardito
    Dec 19, 2018 at 20:11
  • $\begingroup$ Maybe your forearm has these areas painted red and when you move your arm, your forearm moves those areas. $\endgroup$
    – Pep Santacruz
    Nov 8, 2020 at 12:16

1 Answer 1

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Select a vertex which has unwanted movement and check in the "N" properties panel which are its weights, then clear out the unwanted weights, even if they look "blue" in weight paint mode.

enter image description here

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