The maximum number of bones that affect a single vertex.
The value can be either One Bone, Two Bones, Four Bones or Unlimited.
This setting does not change the underlying mesh data; it only affects the number of bone weights that Unity takes into account when performing skinning. This means that a mesh can have bone weight data that is unused due to this setting.
You can set this value for all meshes in the project using QualitySettings.skinWeights. You can set the maximum number of bone weights that mesh data stores for a single vertex using ModelImporter.maxBonesPerVertex.
See Also: Mesh.SetBoneWeights, Mesh.GetAllBoneWeights, Mesh.GetBonesPerVertex, Mesh.boneWeights, Mesh.GetBoneWeights ModelImporter.maxBonesPerVertex, QualitySettings.skinWeights.