Rigidbody m_rigidbody;
m_rigidbody.constrains=RigidbodyConstrains.FreezePosition;//在这个枚举类型里(RigidbodyConstrains),还可以任意冻结
如果你想只不冻结一个轴,比如Y轴。可以这样: m_rigidbody.constrains= ~ RigidbodyConstrains.FreezePositionY; // ~操作符指冻结除这个以外的所有
还可以这样(组合冻结): m_rigidbody.constrains=RigidbodyConstrains.FreezePositionX | RigidbodyConstrains.FreezePositionY |....... // |操作符组合枚举,可以理解为+
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