刚体的质量。
质量可以使用任意单位指定，但在所有情况下都遵循质量的基本物理原理。根据牛顿的经典方程 `force = mass x acceleration` 可知，对象的质量越大，将其加速到给定速度所需的力就越大。此外，质量也影响动量，动量在碰撞过程中十分重要；受到撞击时，质量较大的对象比质量较小的对象的移动距离要短。
当 useAutoMass 为 true 时，也可以自动计算质量。在这种情况下，您无法直接设置质量属性。
另请参阅：useAutoMass。
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