EulerSequence eulerSequenceFromName eulerSequenceName evaluateVector getEulerAngles getRawValue getValue getValue getValue getValue getYawPitchRoll identity inverse invert isIdentity isNull isSame isSame m_Angle m_Axis m_Quat makeRotationByAxes multVec multVec normalize operator!= operator* operator*= operator= operator== operator[] operator[] Rotation Rotation Rotation Rotation Rotation Rotation Rotation scaleAngle setEulerAngles setValue setValue setValue setValue setValue setYawPitchRoll slerp

isNull() bool isNull ( ) const 检查当前旋转对象是否表示一个“空”的旋转 检查当前旋转对象是否表示一个“空”的旋转（四元数的所有分量都为 0）。 返回 如果是“空”旋转，返回 true；否则返回 false