This version of Unity is unsupported.

SkinQuality

enumeration

Description

The maximum number of bones affecting a single vertex.

Properties

AutoChooses the number of bones from the number current QualitySettings. (Default)
Bone1Use only 1 bone to deform a single vertex. (The most important bone will be used).
Bone2Use 2 bones to deform a single vertex. (The most important bones will be used).
Bone4Use 4 bones to deform a single vertex.