axis CoordinateSystem displacement getAxis getPosition getXDirection getYDirection getZDirection setAxes setAxes setAxis setPlacement setPosition setXDirection setYDirection setZDirection transform transform transformTo xdir ydir ~CoordinateSystem

getZDirection() const Vector3d & getZDirection ( ) const 获取Z轴方向 返回当前坐标系的Z轴方向。 返回 Z轴方向