定义大腿的转动/扭转量在髋关节和膝关节之间的分配方式。
当大腿需要基于反向动力学扭转或转动时，upperLegTwist（加权范围为 0..1）决定了对髋关节和膝关节施加旋转的程度。当 upperLegTwist 设置为 0 时，将所有扭转量施加到髋关节。设置为 1 时，将所有扭转量施加到膝关节。默认值为 0.5，即在髋关节和膝关节之间平均分配扭转量。
另请参阅：HumanDescription.lowerArmTwist、HumanDescription.lowerLegTwist、HumanDescription.upperArmTwist。
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