cob_twist_controller.cpp

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/*
 * Copyright 2017 Fraunhofer Institute for Manufacturing Engineering and Automation (IPA)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
 
#include <string>
#include <vector>
#include <limits>
#include <ros/ros.h>
 
#include <cob_twist_controller/cob_twist_controller.h>
 
#include <kdl_conversions/kdl_msg.h>
#include <tf/transform_datatypes.h>
#include <visualization_msgs/Marker.h>
#include <visualization_msgs/MarkerArray.h>
#include <cob_srvs/SetString.h>
 
#include <Eigen/Dense>
 
bool CobTwistController::initialize()
{
    ros::NodeHandle nh_twist("twist_controller");
 
    // JointNames
    if (!nh_.getParam("joint_names", twist_controller_params_.joints))
    {
        ROS_ERROR("Parameter 'joint_names' not set");
        return false;
    }
 
    twist_controller_params_.dof = twist_controller_params_.joints.size();
 
    // Chain
    if (!nh_.getParam("chain_base_link", twist_controller_params_.chain_base_link))
    {
        ROS_ERROR("Parameter 'chain_base_link' not set");
        return false;
    }
 
    if (!nh_.getParam("chain_tip_link", twist_controller_params_.chain_tip_link))
    {
        ROS_ERROR("Parameter 'chain_tip_link' not set");
        return false;
    }
 
    // links of the chain to be considered for collision avoidance
    if (!nh_twist.getParam("collision_check_links", twist_controller_params_.collision_check_links))
    {
        ROS_WARN_STREAM("Parameter 'collision_check_links' not set. Collision Avoidance constraint will not do anything.");
        twist_controller_params_.collision_check_links.clear();
    }
 
    KDL::Tree my_tree;
    if (!kdl_parser::treeFromParam("/robot_description", my_tree))
    {
        ROS_ERROR("Failed to construct kdl tree");
        return false;
    }
 
    my_tree.getChain(twist_controller_params_.chain_base_link, twist_controller_params_.chain_tip_link, chain_);
    if (chain_.getNrOfJoints() == 0)
    {
        ROS_ERROR("Failed to initialize kinematic chain");
        return false;
    }
 
    urdf::Model model;
    if (!model.initParam("/robot_description"))
    {
        ROS_ERROR("Failed to parse urdf file for JointLimits");
        return false;
    }
 
    for (uint16_t i = 0; i < twist_controller_params_.dof; i++)
    {
        if (model.getJoint(twist_controller_params_.joints[i])->type == urdf::Joint::CONTINUOUS)
        {
            twist_controller_params_.limiter_params.limits_min.push_back(-std::numeric_limits<double>::max());
            twist_controller_params_.limiter_params.limits_max.push_back(std::numeric_limits<double>::max());
        }
        else
        {
            twist_controller_params_.limiter_params.limits_min.push_back(model.getJoint(twist_controller_params_.joints[i])->limits->lower);
            twist_controller_params_.limiter_params.limits_max.push_back(model.getJoint(twist_controller_params_.joints[i])->limits->upper);
        }
        twist_controller_params_.limiter_params.limits_vel.push_back(model.getJoint(twist_controller_params_.joints[i])->limits->velocity);
    }
 
    // Currently not supported yet
    if ((!nh_twist.getParam("limits_acc", twist_controller_params_.limiter_params.limits_acc)) || (twist_controller_params_.limiter_params.limits_acc.size() != twist_controller_params_.dof))
    {
        // ROS_ERROR("Parameter 'limits_acc' not set or dimensions do not match! Not limiting acceleration!");
        for (uint16_t i = 0; i < twist_controller_params_.dof; i++)
        {
            twist_controller_params_.limiter_params.limits_acc.push_back(std::numeric_limits<double>::max());
        }
    }
 
    // Configure Lookat Extenstion (Offset and Axis) --- not dynamic-reconfigurable
    if (nh_twist.hasParam("lookat_axis_type"))
    {
        int lookat_axis_type;
        nh_twist.getParam("lookat_axis_type", lookat_axis_type);
        twist_controller_params_.lookat_offset.lookat_axis_type = static_cast<LookatAxisTypes>(lookat_axis_type);
    }
    if (nh_twist.hasParam("lookat_pointing_frame"))
    {
        nh_twist.getParam("lookat_pointing_frame", twist_controller_params_.lookat_pointing_frame);
    }
    else
    {
        if (nh_twist.hasParam("lookat_offset"))
        {
            if (nh_twist.hasParam("lookat_offset/translation"))
            {
                twist_controller_params_.lookat_offset.translation_x = nh_twist.param("lookat_offset/translation/x", 0.0);
                twist_controller_params_.lookat_offset.translation_y = nh_twist.param("lookat_offset/translation/y", 0.0);
                twist_controller_params_.lookat_offset.translation_z = nh_twist.param("lookat_offset/translation/z", 0.0);
            }
            if (nh_twist.hasParam("lookat_offset/rotation"))
            {
                twist_controller_params_.lookat_offset.rotation_x = nh_twist.param("lookat_offset/rotation/x", 0.0);
                twist_controller_params_.lookat_offset.rotation_y = nh_twist.param("lookat_offset/rotation/y", 0.0);
                twist_controller_params_.lookat_offset.rotation_z = nh_twist.param("lookat_offset/rotation/z", 0.0);
                twist_controller_params_.lookat_offset.rotation_w = nh_twist.param("lookat_offset/rotation/w", 1.0);
            }
        }
    }
 
    // Configure Controller Interface
    if (!nh_twist.getParam("controller_interface", twist_controller_params_.controller_interface))
    {
        ROS_ERROR("Parameter 'controller_interface' not set");
        return false;
    }
    nh_twist.param<double>("integrator_smoothing", twist_controller_params_.integrator_smoothing, 0.2);
    try
    {
        interface_loader_.reset(new pluginlib::ClassLoader<cob_twist_controller::ControllerInterfaceBase>("cob_twist_controller", "cob_twist_controller::ControllerInterfaceBase"));
        this->controller_interface_ = interface_loader_->createInstance(twist_controller_params_.controller_interface);
        this->controller_interface_->initialize(this->nh_, this->twist_controller_params_);
    }
    catch(pluginlib::PluginlibException& ex)
    {
        ROS_ERROR("The controller_interface plugin failed to load. Error: %s", ex.what());
        return false;
    }
 
    twist_controller_params_.frame_names.clear();
    for (uint16_t i = 0; i < chain_.getNrOfSegments(); ++i)
    {
        twist_controller_params_.frame_names.push_back(chain_.getSegment(i).getName());
    }
    register_link_client_ = nh_.serviceClient<cob_srvs::SetString>("obstacle_distance/registerLinkOfInterest");
    register_link_client_.waitForExistence(ros::Duration(5.0));
    twist_controller_params_.constraint_ca = CA_OFF;
 
    p_inv_diff_kin_solver_.reset(new InverseDifferentialKinematicsSolver(twist_controller_params_, chain_, callback_data_mediator_));
    p_inv_diff_kin_solver_->resetAll(twist_controller_params_);
 
    reconfigure_server_.reset(new dynamic_reconfigure::Server<cob_twist_controller::TwistControllerConfig>(reconfig_mutex_, nh_twist));
    reconfigure_server_->setCallback(boost::bind(&CobTwistController::reconfigureCallback,   this, _1, _2));
 
    this->joint_states_.current_q_ = KDL::JntArray(chain_.getNrOfJoints());
    this->joint_states_.current_q_dot_ = KDL::JntArray(chain_.getNrOfJoints());
    this->joint_states_.last_q_ = KDL::JntArray(chain_.getNrOfJoints());
    this->joint_states_.last_q_dot_ = KDL::JntArray(chain_.getNrOfJoints());
 
    ros::Duration(1.0).sleep();
 
    obstacle_distance_sub_ = nh_.subscribe("obstacle_distance", 1, &CallbackDataMediator::distancesToObstaclesCallback, &callback_data_mediator_);
    jointstate_sub_ = nh_.subscribe("joint_states", 1, &CobTwistController::jointstateCallback, this);
    twist_sub_ = nh_twist.subscribe("command_twist", 1, &CobTwistController::twistCallback, this);
    twist_stamped_sub_ = nh_twist.subscribe("command_twist_stamped", 1, &CobTwistController::twistStampedCallback, this);
 
    odometry_sub_ = nh_.subscribe("base/odometry", 1, &CobTwistController::odometryCallback, this);
 
    twist_direction_pub_ = nh_.advertise<visualization_msgs::MarkerArray>("twist_direction", 1);
 
    ROS_INFO_STREAM(nh_.getNamespace() << "/twist_controller...initialized!");
    return true;
}
 
bool CobTwistController::registerCollisionLinks()
{
    ROS_WARN_COND(twist_controller_params_.collision_check_links.size() <= 0,
                  "No collision_check_links set for this chain. Nothing will be registered. Ensure parameters are set correctly.");
 
    for (std::vector<std::string>::const_iterator it = twist_controller_params_.collision_check_links.begin();
         it != twist_controller_params_.collision_check_links.end();
         it++)
    {
        ROS_INFO_STREAM("Trying to register for " << *it);
        cob_srvs::SetString r;
        r.request.data = *it;
        if (register_link_client_.call(r))
        {
            ROS_INFO_STREAM("Called registration service with success: " << int(r.response.success) << ". Got message: " << r.response.message);
            if (!r.response.success)
            {
                return false;
            }
        }
        else
        {
            ROS_WARN_STREAM("Failed to call registration service for namespace: " << nh_.getNamespace());
            return false;
        }
    }
 
    return true;
}
 
void CobTwistController::reconfigureCallback(cob_twist_controller::TwistControllerConfig& config, uint32_t level)
{
    TwistControllerParams backup = this->twist_controller_params_;
    this->checkSolverAndConstraints(config);
    
    this->twist_controller_params_.from_config(config);
 
    if (!p_inv_diff_kin_solver_->resetAll(this->twist_controller_params_))
    {
        ROS_ERROR_STREAM("ResetAll during DynamicReconfigureCallback failed! Resetting to previous config");
        twist_controller_params_ = backup;
        p_inv_diff_kin_solver_->resetAll(this->twist_controller_params_);
        this->twist_controller_params_.to_config(config);
    }
}
 
void CobTwistController::checkSolverAndConstraints(cob_twist_controller::TwistControllerConfig& config)
{
    bool warning = false;
 
    DampingMethodTypes damping = static_cast<DampingMethodTypes>(config.damping_method);
    if (damping != twist_controller_params_.damping_method)
    {
        //damping method has changed - setting back to proper default values
        if (damping == CONSTANT)
        {
            config.damping_factor = 0.01;
        }
        else if (damping == MANIPULABILITY)
        {
            config.lambda_max = 0.1;
            config.w_threshold = 0.005;
        }
        else if (damping == LEAST_SINGULAR_VALUE)
        {
            config.lambda_max = 0.1;
            config.w_threshold = 0.005;
        }
        else if (damping == SIGMOID)
        {
            config.lambda_max = 0.001;
            config.w_threshold = 0.001;
        }
    }
 
    SolverTypes solver = static_cast<SolverTypes>(config.solver);
 
    if (DEFAULT_SOLVER == solver && (JLA_OFF != static_cast<ConstraintTypesJLA>(config.constraint_jla) || CA_OFF != static_cast<ConstraintTypesCA>(config.constraint_ca)))
    {
        ROS_ERROR("The selection of Default solver and a constraint doesn\'t make any sense. Switch settings back ...");
        twist_controller_params_.constraint_jla = JLA_OFF;
        twist_controller_params_.constraint_ca = CA_OFF;
        config.constraint_jla = static_cast<int>(twist_controller_params_.constraint_jla);
        config.constraint_ca = static_cast<int>(twist_controller_params_.constraint_ca);
        warning = true;
    }
 
    if (WLN == solver && CA_OFF != static_cast<ConstraintTypesCA>(config.constraint_ca))
    {
        ROS_ERROR("The WLN solution doesn\'t support collision avoidance. Currently WLN is only implemented for Identity and JLA ...");
        twist_controller_params_.constraint_ca = CA_OFF;
        config.constraint_ca = static_cast<int>(twist_controller_params_.constraint_ca);
        warning = true;
    }
 
    if (GPM == solver && CA_OFF == static_cast<ConstraintTypesCA>(config.constraint_ca) && JLA_OFF == static_cast<ConstraintTypesJLA>(config.constraint_jla))
    {
        ROS_ERROR("You have chosen GPM but without constraints! The behaviour without constraints will be the same like for DEFAULT_SOLVER.");
        warning = true;
    }
 
    if (TASK_2ND_PRIO == solver && (JLA_ON == static_cast<ConstraintTypesJLA>(config.constraint_jla) || CA_OFF == static_cast<ConstraintTypesCA>(config.constraint_ca)))
    {
        ROS_ERROR("The projection of a task into the null space of the main EE task is currently only for the CA constraint supported!");
        twist_controller_params_.constraint_jla = JLA_OFF;
        twist_controller_params_.constraint_ca = CA_ON;
        config.constraint_jla = static_cast<int>(twist_controller_params_.constraint_jla);
        config.constraint_ca = static_cast<int>(twist_controller_params_.constraint_ca);
        warning = true;
    }
 
    if (UNIFIED_JLA_SA == solver && CA_OFF != static_cast<ConstraintTypesCA>(config.constraint_ca))
    {
        ROS_ERROR("The Unified JLA and SA solution doesn\'t support collision avoidance. Currently UNIFIED_JLA_SA is only implemented for SA and JLA ...");
        twist_controller_params_.constraint_ca = CA_OFF;
        config.constraint_ca = static_cast<int>(twist_controller_params_.constraint_ca);
        warning = true;
    }
 
    if (CA_OFF != static_cast<ConstraintTypesCA>(config.constraint_ca))
    {
        if (!register_link_client_.exists())
        {
            ROS_ERROR("ServiceServer 'obstacle_distance/registerLinkOfInterest' does not exist. CA not possible");
            twist_controller_params_.constraint_ca = CA_OFF;
            config.constraint_ca = static_cast<int>(twist_controller_params_.constraint_ca);
            warning = true;
        }
        else if (twist_controller_params_.constraint_ca != static_cast<ConstraintTypesCA>(config.constraint_ca))
        {
            ROS_INFO("Collision Avoidance has been activated! Register links!");
            if (!this->registerCollisionLinks())
            {
                ROS_ERROR("Registration of links failed. CA not possible");
                twist_controller_params_.constraint_ca = CA_OFF;
                config.constraint_ca = static_cast<int>(twist_controller_params_.constraint_ca);
                warning = true;
            }
        }
    }
 
    if (twist_controller_params_.limiter_params.limits_tolerance <= DIV0_SAFE)
    {
        ROS_ERROR("The limits_tolerance for enforce limits is smaller than DIV/0 threshold. Therefore output limiting is disabled");
        twist_controller_params_.limiter_params.enforce_pos_limits = config.enforce_pos_limits = false;
        twist_controller_params_.limiter_params.enforce_vel_limits = config.enforce_vel_limits = false;
        twist_controller_params_.limiter_params.enforce_acc_limits = config.enforce_acc_limits = false;
    }
    if (twist_controller_params_.limiter_params.max_lin_twist <= DIV0_SAFE ||
        twist_controller_params_.limiter_params.max_rot_twist <= DIV0_SAFE)
    {
        ROS_ERROR("The limits used to limit Cartesian velocities are smaller than DIV/0 threshold. Therefore input limiting is disabled");
        twist_controller_params_.limiter_params.enforce_input_limits = config.enforce_input_limits = false;
    }
 
    if (!warning)
    {
        ROS_INFO("Parameters seem to be ok.");
    }
}
 
void CobTwistController::twistStampedCallback(const geometry_msgs::TwistStamped::ConstPtr& msg)
{
    tf::StampedTransform transform_tf;
    KDL::Frame frame;
    KDL::Twist twist, twist_transformed;
 
    try
    {
        tf_listener_.lookupTransform(twist_controller_params_.chain_base_link, msg->header.frame_id, ros::Time(0), transform_tf);
        frame.M = KDL::Rotation::Quaternion(transform_tf.getRotation().x(), transform_tf.getRotation().y(), transform_tf.getRotation().z(), transform_tf.getRotation().w());
    }
    catch (tf::TransformException& ex)
    {
        ROS_ERROR("CobTwistController::twistStampedCallback: \n%s", ex.what());
        return;
    }
 
    tf::twistMsgToKDL(msg->twist, twist);
    twist_transformed = frame*twist;
    solveTwist(twist_transformed);
}
 
void CobTwistController::twistCallback(const geometry_msgs::Twist::ConstPtr& msg)
{
    KDL::Twist twist;
    tf::twistMsgToKDL(*msg, twist);
    solveTwist(twist);
}
 
void CobTwistController::solveTwist(KDL::Twist twist)
{
    ros::Time start, end;
    start = ros::Time::now();
 
    visualizeTwist(twist);
 
    KDL::JntArray q_dot_ik(chain_.getNrOfJoints());
 
    if (twist_controller_params_.kinematic_extension == BASE_COMPENSATION)
    {
        twist = twist - twist_odometry_cb_;
    }
 
    int ret_ik = p_inv_diff_kin_solver_->CartToJnt(this->joint_states_,
                                                   twist,
                                                   q_dot_ik);
 
    if (0 != ret_ik)
    {
        ROS_ERROR("No Vel-IK found!");
    }
    else
    {
        this->controller_interface_->processResult(q_dot_ik, this->joint_states_.current_q_);
    }
 
    end = ros::Time::now();
    // ROS_INFO_STREAM("solveTwist took " << (end-start).toSec() << " seconds");
}
 
void CobTwistController::visualizeTwist(KDL::Twist twist)
{
    std::string tracking_frame = twist_controller_params_.chain_tip_link;
    if (twist_controller_params_.kinematic_extension == LOOKAT)
    {
        tracking_frame = "lookat_focus_frame";
    }
 
    tf::StampedTransform transform_tf;
    try
    {
        tf_listener_.lookupTransform(twist_controller_params_.chain_base_link, tracking_frame, ros::Time(0), transform_tf);
    }
    catch (tf::TransformException& ex)
    {
        ROS_ERROR("CobTwistController::visualizeTwist: \n%s", ex.what());
        return;
    }
 
    visualization_msgs::Marker marker_vel;
    marker_vel.header.frame_id = twist_controller_params_.chain_base_link;
    marker_vel.header.stamp = ros::Time::now();
    marker_vel.ns = "twist_vel";
    marker_vel.id = 0;
    marker_vel.type = visualization_msgs::Marker::ARROW;
    marker_vel.action = visualization_msgs::Marker::ADD;
    marker_vel.lifetime = ros::Duration(0.1);
    marker_vel.pose.orientation.w = 1.0;
 
    marker_vel.scale.x = 0.02;
    marker_vel.scale.y = 0.02;
    marker_vel.scale.z = 0.02;
 
    marker_vel.color.r = 1.0f;
    marker_vel.color.g = 1.0f;
    marker_vel.color.b = 0.0f;
    marker_vel.color.a = 1.0;
 
    marker_vel.points.resize(2);
    marker_vel.points[0].x = transform_tf.getOrigin().x();
    marker_vel.points[0].y = transform_tf.getOrigin().y();
    marker_vel.points[0].z = transform_tf.getOrigin().z();
    marker_vel.points[1].x = transform_tf.getOrigin().x() + 5.0 * twist.vel.x();
    marker_vel.points[1].y = transform_tf.getOrigin().y() + 5.0 * twist.vel.y();
    marker_vel.points[1].z = transform_tf.getOrigin().z() + 5.0 * twist.vel.z();
 
    visualization_msgs::Marker marker_rot;
    marker_rot.header.frame_id = twist_controller_params_.chain_base_link;
    marker_rot.header.stamp = ros::Time::now();
    marker_rot.ns = "twist_rot";
    marker_rot.id = 0;
    marker_rot.type = visualization_msgs::Marker::CYLINDER;
    marker_rot.action = visualization_msgs::Marker::ADD;
    marker_rot.lifetime = ros::Duration(0.1);
    marker_rot.pose.position.x = transform_tf.getOrigin().x();
    marker_rot.pose.position.y = transform_tf.getOrigin().y();
    marker_rot.pose.position.z = transform_tf.getOrigin().z();
 
    tf::Quaternion rot;
    rot.setRPY(twist.rot.x(), twist.rot.y(), twist.rot.z());
 
    tf::Vector3 z_axis = tf::Vector3(0, 0, 1);
    tf::Vector3 t_axis = rot.getAxis();
    tf::Quaternion temp(0, 0, 0, 1);
    if (z_axis != t_axis && z_axis != -t_axis)
    {
        tf::Vector3 cross = z_axis.cross(t_axis);
        temp = tf::Quaternion(cross.x(), cross.y(), cross.z(), (std::sqrt(z_axis.length2() * t_axis.length2()) + z_axis.dot(t_axis)));
        temp = temp.normalized();
    }
    tf::quaternionTFToMsg(temp, marker_rot.pose.orientation);
 
    marker_rot.scale.x = rot.getAngle();
    marker_rot.scale.y = rot.getAngle();
    marker_rot.scale.z = 0.002;
 
    marker_rot.color.r = 1.0f;
    marker_rot.color.g = 1.0f;
    marker_rot.color.b = 0.0f;
    marker_rot.color.a = 1.0;
 
    visualization_msgs::MarkerArray markers;
    markers.markers.push_back(marker_vel);
    markers.markers.push_back(marker_rot);
 
    twist_direction_pub_.publish(markers);
}
 
void CobTwistController::jointstateCallback(const sensor_msgs::JointState::ConstPtr& msg)
{
    KDL::JntArray q_temp = this->joint_states_.current_q_;
    KDL::JntArray q_dot_temp = this->joint_states_.current_q_dot_;
    int count = 0;
 
    for (uint16_t j = 0; j < twist_controller_params_.dof; j++)
    {
        for (uint16_t i = 0; i < msg->name.size(); i++)
        {
            if (strcmp(msg->name[i].c_str(), twist_controller_params_.joints[j].c_str()) == 0)
            {
                q_temp(j) = msg->position[i];
                q_dot_temp(j) = msg->velocity[i];
                count++;
                break;
            }
        }
    }
 
    if (count == twist_controller_params_.joints.size())
    {
        this->joint_states_.last_q_ = joint_states_.current_q_;
        this->joint_states_.last_q_dot_ = joint_states_.current_q_dot_;
        this->joint_states_.current_q_ = q_temp;
        this->joint_states_.current_q_dot_ = q_dot_temp;
    }
}
 
void CobTwistController::odometryCallback(const nav_msgs::Odometry::ConstPtr& msg)
{
    KDL::Twist twist_odometry_bl, tangential_twist_bl, twist_odometry_transformed_cb;
    KDL::Frame cb_frame_bl;
    tf::StampedTransform cb_transform_bl, bl_transform_ct;
 
    try
    {
        tf_listener_.waitForTransform(twist_controller_params_.chain_base_link, "base_link", ros::Time(0), ros::Duration(0.5));
        tf_listener_.lookupTransform(twist_controller_params_.chain_base_link, "base_link", ros::Time(0), cb_transform_bl);
 
        tf_listener_.waitForTransform("base_link", twist_controller_params_.chain_tip_link, ros::Time(0), ros::Duration(0.5));
        tf_listener_.lookupTransform("base_link", twist_controller_params_.chain_tip_link, ros::Time(0), bl_transform_ct);
 
        cb_frame_bl.p = KDL::Vector(cb_transform_bl.getOrigin().x(), cb_transform_bl.getOrigin().y(), cb_transform_bl.getOrigin().z());
        cb_frame_bl.M = KDL::Rotation::Quaternion(cb_transform_bl.getRotation().x(), cb_transform_bl.getRotation().y(), cb_transform_bl.getRotation().z(), cb_transform_bl.getRotation().w());
    }
    catch (tf::TransformException& ex)
    {
        ROS_ERROR("CobTwistController::odometryCallback: \n%s", ex.what());
        return;
    }
 
    try
    {
        // Calculate tangential twist for angular base movements v = w x r
        Eigen::Vector3d r(bl_transform_ct.getOrigin().x(), bl_transform_ct.getOrigin().y(), bl_transform_ct.getOrigin().z());
        Eigen::Vector3d w(0, 0, msg->twist.twist.angular.z);
        Eigen::Vector3d res = w.cross(r);
        tangential_twist_bl.vel = KDL::Vector(res(0), res(1), res(2));
        tangential_twist_bl.rot = KDL::Vector(0, 0, 0);
    }
    catch(...)
    {
        ROS_ERROR("Error occurred while calculating tangential twist for angular base movements.");
        return;
    }
 
    tf::twistMsgToKDL(msg->twist.twist, twist_odometry_bl);  // Base Twist
 
    // transform into chain_base
    twist_odometry_transformed_cb = cb_frame_bl * (twist_odometry_bl + tangential_twist_bl);
 
    twist_odometry_cb_ = twist_odometry_transformed_cb;
}