Weight_map_painting
In 3D computer graphics software, vertex painting refers to interactive editing tools for modifying vertex attributes directly on a 3D polygon mesh, using painting tools similar to any digital painting application but working in a 3D viewport on a perspective view of a rotated model. It is similar to a 3D paint tool but operates specifically to vertex data rather than texture maps.
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It is most often used for modifying weight maps for skeletal animation, to tweak the influence of individual bones when deforming surfaces around joints.[1]