The values that describe how much influence bones have on a vertex in skinning calculations.
This attribute is optional. Up to four weights can be included in the vertex stream.
Blend weights are commonly represented using floats.
This attribute corresponds to the BLENDWEIGHTS semantic in the HLSL shading language.
You can set blend weights for vertices using methods such as Mesh.SetBoneWeights.
For more information, refer to mesh vertex data.