Quaterniond类 参考

Public 成员函数
	Quaterniond (double s, Vector3d v)
	Quaterniond (double w, double x, double y, double z)
void	setX (double value)
double	getX ()
void	setY (double value)
double	getY ()
void	setZ (double value)
double	getZ ()
void	setW (double value)
double	getW ()