C++ tf::Transformer类代码示例

  bool transformVectorTo(const tf::Transformer& tf, const string& source_frame, const string& goal_frame, const Time& time_source,
                         const geometry_msgs::Vector3& point_in, geometry_msgs::Vector3& point_out, const std::string& fixed_frame, const Time& time_goal)
  {
    ros::Duration timeout = Duration().fromSec(2.0);
    if (!tf.waitForTransform(source_frame, time_source, goal_frame, time_goal, fixed_frame, timeout)) return false;
    tf::Stamped<tf::Point> pnt(tf::Vector3(point_in.x, point_in.y, point_in.z), time_source, source_frame);
    tf.transformVector(goal_frame, time_goal, pnt, fixed_frame, pnt);
    point_out.x = pnt[0];
    point_out.y = pnt[1];
    point_out.z = pnt[2];

    return true;
  }

bool projectRayToGround(const tf::Transformer& listener,
      const tf::Stamped<tf::Point> camera_ray,
      Eigen::Vector4d ground_plane, std::string ground_frame,
      tf::Stamped<tf::Point>* world_point)
{
    tf::StampedTransform camera_transform;
    // This is a static link, so Time(0) should be fine
    if (!listener.canTransform(ground_frame, camera_ray.frame_id_, camera_ray.stamp_)) {
        ROS_INFO("Couldn't transform %s to %s\n",camera_ray.frame_id_.c_str(),
                ground_frame.c_str());
        return false;
    }
    listener.lookupTransform(ground_frame, camera_ray.frame_id_,ros::Time(0),camera_transform);
    tf::Stamped<tf::Point> ground_frame_ray;
    listener.transformVector(ground_frame, camera_ray, ground_frame_ray);
    Eigen::Vector3d ray, ray_origin;
    tf::vectorTFToEigen(ground_frame_ray, ray);
    tf::vectorTFToEigen(camera_transform.getOrigin(), ray_origin);
    Eigen::Vector3d ground_v = intersectRayPlane(ray, ray_origin, ground_plane); 
    tf::vectorEigenToTF(ground_v, *world_point);
    world_point->frame_id_ = ground_frame;
    world_point->stamp_ = camera_ray.stamp_;
    return true;
}

// detected object = checkerboard, target = plug
bool RosDetector::detectObject(const sensor_msgs::ImageConstPtr& image_msg,
                               const sensor_msgs::CameraInfoConstPtr& info_msg,
                               const tf::Stamped<tf::Pose>& target_prior, const tf::Transformer& transformer,
                               tf::Stamped<tf::Pose>& target_pose)
{
    // Convert image message
    cv_bridge::CvImageConstPtr cv_image = cv_bridge::toCvShare(image_msg, "mono8");
    cv::Mat image = cv_image->image;

    // Detect the checkerboard
    std::vector<cv::Point2f> corners;
    if (!detector_.detect(image, corners)) {
        ROS_DEBUG("%s: Failed to detect checkerboard", name_.c_str());
        publishDisplayImage(image, corners, false);
        /// @todo Publish feedback?
        return false;
    }

    // Estimate its pose
    cam_model_.fromCameraInfo(info_msg);
    tf::Stamped<tf::Pose> target_prior_in_camera;
    try {
        transformer.transformPose(cam_model_.tfFrame(), target_prior, target_prior_in_camera);
    }
    catch (tf::TransformException& ex) {
        ROS_WARN("%s: TF exception\n%s", name_.c_str(), ex.what());
        return false;
    }
    tf::Pose detected_object_prior = target_prior_in_camera * target_in_detected_object_.inverse();
    tf::Pose detected_object_pose = pose_estimator_.solveWithPrior(corners, cam_model_, detected_object_prior);
    target_pose = tf::Stamped<tf::Pose>(detected_object_pose * target_in_detected_object_,
                                        image_msg->header.stamp, cam_model_.tfFrame());

    // Publish visualization messages
    tf_broadcaster_.sendTransform(tf::StampedTransform(detected_object_prior, image_msg->header.stamp,
                                  cam_model_.tfFrame(), "checkerboard_prior_frame"));
    tf_broadcaster_.sendTransform(tf::StampedTransform(target_prior, target_prior.stamp_,
                                  target_prior.frame_id_, "plug_prior_frame"));
    tf_broadcaster_.sendTransform(tf::StampedTransform(detected_object_pose, image_msg->header.stamp,
                                  cam_model_.tfFrame(), "checkerboard_frame"));
    tf_broadcaster_.sendTransform(tf::StampedTransform(target_pose, image_msg->header.stamp,
                                  cam_model_.tfFrame(), "plug_frame"));
    publishDisplayImage(image, corners, true);

    return true;
}

  void LaserProjection::transformLaserScanToPointCloud_ (const std::string &target_frame, 
                                                        const sensor_msgs::LaserScan &scan_in,
                                                        sensor_msgs::PointCloud2 &cloud_out, 
                                                        tf::Transformer &tf, 
                                                        double range_cutoff,
                                                        int channel_options)
  {
    //check if the user has requested the index field
    bool requested_index = false;
    if ((channel_options & channel_option::Index))
      requested_index = true;

    //we'll enforce that we get index values for the laser scan so that we
    //ensure that we use the correct timestamps
    channel_options |= channel_option::Index;

    projectLaser_(scan_in, cloud_out, -1.0, channel_options);

    //we'll assume no associated viewpoint by default
    bool has_viewpoint = false;
    uint32_t vp_x_offset = 0;

    //we need to find the offset of the intensity field in the point cloud
    //we also know that the index field is guaranteed to exist since we 
    //set the channel option above. To be really safe, it might be worth
    //putting in a check at some point, but I'm just going to put in an
    //assert for now
    uint32_t index_offset = 0;
    for(unsigned int i = 0; i < cloud_out.fields.size(); ++i)
    {
      if(cloud_out.fields[i].name == "index")
      {
        index_offset = cloud_out.fields[i].offset;
      }

      //we want to check if the cloud has a viewpoint associated with it
      //checking vp_x should be sufficient since vp_x, vp_y, and vp_z all
      //get put in together
      if(cloud_out.fields[i].name == "vp_x")
      {
        has_viewpoint = true;
        vp_x_offset = cloud_out.fields[i].offset;
      }
    }

    ROS_ASSERT(index_offset > 0);

    cloud_out.header.frame_id = target_frame;

    // Extract transforms for the beginning and end of the laser scan
    ros::Time start_time = scan_in.header.stamp;
    ros::Time end_time   = scan_in.header.stamp + ros::Duration ().fromSec (scan_in.ranges.size () * scan_in.time_increment);

    tf::StampedTransform start_transform, end_transform, cur_transform ;

    tf.lookupTransform (target_frame, scan_in.header.frame_id, start_time, start_transform);
    tf.lookupTransform (target_frame, scan_in.header.frame_id, end_time, end_transform);

    double ranges_norm = 1 / ((double) scan_in.ranges.size () - 1.0);

    //we want to loop through all the points in the cloud
    for(size_t i = 0; i < cloud_out.width; ++i)
    {
      // Apply the transform to the current point
      float *pstep = (float*)&cloud_out.data[i * cloud_out.point_step + 0];

      //find the index of the point
      uint32_t pt_index;
      memcpy(&pt_index, &cloud_out.data[i * cloud_out.point_step + index_offset], sizeof(uint32_t));
      
      // Assume constant motion during the laser-scan, and use slerp to compute intermediate transforms
      tfScalar ratio = pt_index * ranges_norm;

      //! \todo Make a function that performs both the slerp and linear interpolation needed to interpolate a Full Transform (Quaternion + Vector)
      // Interpolate translation
      tf::Vector3 v (0, 0, 0);
      v.setInterpolate3 (start_transform.getOrigin (), end_transform.getOrigin (), ratio);
      cur_transform.setOrigin (v);

      // Interpolate rotation
      tf::Quaternion q1, q2;
      start_transform.getBasis ().getRotation (q1);
      end_transform.getBasis ().getRotation (q2);

      // Compute the slerp-ed rotation
      cur_transform.setRotation (slerp (q1, q2 , ratio));

      tf::Vector3 point_in (pstep[0], pstep[1], pstep[2]);
      tf::Vector3 point_out = cur_transform * point_in;

      // Copy transformed point into cloud
      pstep[0] = point_out.x ();
      pstep[1] = point_out.y ();
      pstep[2] = point_out.z ();

      // Convert the viewpoint as well
      if(has_viewpoint)
      {
        float *vpstep = (float*)&cloud_out.data[i * cloud_out.point_step + vp_x_offset];
        point_in = tf::Vector3 (vpstep[0], vpstep[1], vpstep[2]);
//.........这里部分代码省略.........

  void
    LaserProjection::transformLaserScanToPointCloud_ (const std::string &target_frame, sensor_msgs::PointCloud &cloud_out, const sensor_msgs::LaserScan &scan_in,
                                                     tf::Transformer& tf, double range_cutoff, int mask)
  {
    cloud_out.header = scan_in.header;

    tf::Stamped<tf::Point> pointIn;
    tf::Stamped<tf::Point> pointOut;

    //check if the user has requested the index field
    bool requested_index = false;
    if ((mask & channel_option::Index))
      requested_index = true;

    //we need to make sure that we include the index in our mask
    //in order to guarantee that we get our timestamps right
    mask |= channel_option::Index;

    pointIn.frame_id_ = scan_in.header.frame_id;

    projectLaser_ (scan_in, cloud_out, range_cutoff, false, mask);

    cloud_out.header.frame_id = target_frame;

    // Extract transforms for the beginning and end of the laser scan
    ros::Time start_time = scan_in.header.stamp ;
    ros::Time end_time   = scan_in.header.stamp + ros::Duration().fromSec(scan_in.ranges.size()*scan_in.time_increment) ;

    tf::StampedTransform start_transform ;
    tf::StampedTransform end_transform ;
    tf::StampedTransform cur_transform ;

    tf.lookupTransform(target_frame, scan_in.header.frame_id, start_time, start_transform) ;
    tf.lookupTransform(target_frame, scan_in.header.frame_id, end_time, end_transform) ;

    //we need to find the index of the index channel
    int index_channel_idx = -1;
    for(unsigned int i = 0; i < cloud_out.channels.size(); ++i)
    {
      if(cloud_out.channels[i].name == "index")
      {
        index_channel_idx = i;
        break;
      }
    }

    //check just in case
    ROS_ASSERT(index_channel_idx >= 0);

    for(unsigned int i = 0; i < cloud_out.points.size(); ++i)
    {
      //get the index for this point
      uint32_t pt_index = cloud_out.channels[index_channel_idx].values[i];

      // Instead, assume constant motion during the laser-scan, and use slerp to compute intermediate transforms
      tfScalar ratio = pt_index / ( (double) scan_in.ranges.size() - 1.0) ;

      //! \todo Make a function that performs both the slerp and linear interpolation needed to interpolate a Full Transform (Quaternion + Vector)

      //Interpolate translation
      tf::Vector3 v (0, 0, 0);
      v.setInterpolate3(start_transform.getOrigin(), end_transform.getOrigin(), ratio) ;
      cur_transform.setOrigin(v) ;

      //Interpolate rotation
      tf::Quaternion q1, q2 ;
      start_transform.getBasis().getRotation(q1) ;
      end_transform.getBasis().getRotation(q2) ;

      // Compute the slerp-ed rotation
      cur_transform.setRotation( slerp( q1, q2 , ratio) ) ;

      // Apply the transform to the current point
      tf::Vector3 pointIn(cloud_out.points[i].x, cloud_out.points[i].y, cloud_out.points[i].z) ;
      tf::Vector3 pointOut = cur_transform * pointIn ;

      // Copy transformed point into cloud
      cloud_out.points[i].x  = pointOut.x();
      cloud_out.points[i].y  = pointOut.y();
      cloud_out.points[i].z  = pointOut.z();
    }

    //if the user didn't request the index, we want to remove it from the channels
    if(!requested_index)
      cloud_out.channels.erase(cloud_out.channels.begin() + index_channel_idx);
  }

srs_ui_but::COBStretch calculateStretch(std::vector<std::string> links)
{
  ros::Time time_stamp = ros::Time().now();

  float radius = 0;
  float height = 0;

  for (std::vector<std::string>::iterator i = links.begin(); i != links.end(); i++)
  {
    try
    {
      tfListener->waitForTransform(*i, srs_ui_but::DEFAULT_COB_BASE_LINK, time_stamp, ros::Duration(0.2));
      tfListener->lookupTransform(*i, srs_ui_but::DEFAULT_COB_BASE_LINK, time_stamp, linkToBaseTf);

      transformer.setTransform(linkToBaseTf);

      // Transform link to camera
      tf::Stamped<btVector3> p;
      p.setX(0);
      p.setY(0);
      p.setZ(0);
      p.frame_id_ = *i;
      transformer.transformPoint(srs_ui_but::DEFAULT_COB_BASE_LINK, p, p);

      //std::cout << p.getX() << ", " << p.getY() << ", " << p.getZ() << ", " << std::endl;

      float r = pow(p.getX(), 2) + pow(p.getY(), 2);
      if (r > radius)
      {
        radius = r;
        height = p.getZ();
      }
    }

    catch (tf::TransformException& ex)
    {
      ROS_WARN("Transform ERROR:\n %s", ex.what());
    }
  }

  srs_ui_but::COBStretch cob_stretch;
  cob_stretch.radius = sqrt(radius);
  cob_stretch.height = height;
  cob_stretch.time_stamp = time_stamp;

  return cob_stretch;
}

static void
initialize_transformations(void)
{
	tf::Time::init();

	tf::Transform velodyne_position_on_board;	
	velodyne_position_on_board.setOrigin(carmen_vector3_to_tf_vector3(velodyne_pose.position));
	velodyne_position_on_board.setRotation(carmen_rotation_to_tf_quaternion(velodyne_pose.orientation));
	tf::StampedTransform board_to_velodyne_transform(velodyne_position_on_board, tf::Time(0), board_tf_name, velodyne_tf_name);
	transformer.setTransform(board_to_velodyne_transform, "board_to_velodyne_transform");

	tf::Transform board_position_on_car;	
	board_position_on_car.setOrigin(carmen_vector3_to_tf_vector3(sensor_board_pose.position));
	board_position_on_car.setRotation(carmen_rotation_to_tf_quaternion(sensor_board_pose.orientation));
	tf::StampedTransform car_to_board_transform(board_position_on_car, tf::Time(0), car_tf_name, board_tf_name);
	transformer.setTransform(car_to_board_transform, "car_to_board_transform");
}

void 
initialize_transforms()
{
	tf::Transform board_to_camera_pose;
	tf::Transform car_to_board_pose;
	tf::Transform world_to_car_pose;
	tf::Transform ultrasonic_sensor_r1_to_car_pose;
	tf::Transform ultrasonic_sensor_r2_to_car_pose;
	tf::Transform ultrasonic_sensor_l1_to_car_pose;
	tf::Transform ultrasonic_sensor_l2_to_car_pose;

	tf::Time::init();

	// initial car pose with respect to the world
	world_to_car_pose.setOrigin(tf::Vector3(car_pose_g.position.x, car_pose_g.position.y, car_pose_g.position.z));
	world_to_car_pose.setRotation(tf::Quaternion(car_pose_g.orientation.yaw, car_pose_g.orientation.pitch, car_pose_g.orientation.roll));
	tf::StampedTransform world_to_car_transform(world_to_car_pose, tf::Time(0), "/world", "/car");
	tf_transformer.setTransform(world_to_car_transform, "world_to_car_transform");

	// board pose with respect to the car
	car_to_board_pose.setOrigin(tf::Vector3(sensor_board_pose_g.position.x, sensor_board_pose_g.position.y, sensor_board_pose_g.position.z));
	car_to_board_pose.setRotation(tf::Quaternion(sensor_board_pose_g.orientation.yaw, sensor_board_pose_g.orientation.pitch, sensor_board_pose_g.orientation.roll)); 				// yaw, pitch, roll
	tf::StampedTransform car_to_board_transform(car_to_board_pose, tf::Time(0), "/car", "/board");
	tf_transformer.setTransform(car_to_board_transform, "car_to_board_transform");

	// camera pose with respect to the board
	board_to_camera_pose.setOrigin(tf::Vector3(camera_pose_g.position.x, camera_pose_g.position.y, camera_pose_g.position.z));
	board_to_camera_pose.setRotation(tf::Quaternion(camera_pose_g.orientation.yaw, camera_pose_g.orientation.pitch, camera_pose_g.orientation.roll)); 				// yaw, pitch, roll
	tf::StampedTransform board_to_camera_transform(board_to_camera_pose, tf::Time(0), "/board", "/camera");
	tf_transformer.setTransform(board_to_camera_transform, "board_to_camera_transform");

	// initial ultrasonic sensor r1 pose with respect to the car
	ultrasonic_sensor_r1_to_car_pose.setOrigin(tf::Vector3(ultrasonic_sensor_r1_g.position.x, ultrasonic_sensor_r1_g.position.y, ultrasonic_sensor_r1_g.position.z));
	ultrasonic_sensor_r1_to_car_pose.setRotation(tf::Quaternion(ultrasonic_sensor_r1_g.orientation.yaw, ultrasonic_sensor_r1_g.orientation.pitch, ultrasonic_sensor_r1_g.orientation.roll));
	tf::StampedTransform ultrasonic_sensor_r1_to_car_transform(ultrasonic_sensor_r1_to_car_pose, tf::Time(0), "/car", "/ultrasonic_sensor_r1");
	tf_transformer.setTransform(ultrasonic_sensor_r1_to_car_transform, "ultrasonic_sensor_r1_to_car_transform");

	// initial ultrasonic sensor r2 pose with respect to the car
	ultrasonic_sensor_r2_to_car_pose.setOrigin(tf::Vector3(ultrasonic_sensor_r2_g.position.x, ultrasonic_sensor_r2_g.position.y, ultrasonic_sensor_r2_g.position.z));
	ultrasonic_sensor_r2_to_car_pose.setRotation(tf::Quaternion(ultrasonic_sensor_r2_g.orientation.yaw, ultrasonic_sensor_r2_g.orientation.pitch, ultrasonic_sensor_r2_g.orientation.roll));
	tf::StampedTransform ultrasonic_sensor_r2_to_car_transform(ultrasonic_sensor_r2_to_car_pose, tf::Time(0), "/car", "/ultrasonic_sensor_r2");
	tf_transformer.setTransform(ultrasonic_sensor_r2_to_car_transform, "ultrasonic_sensor_r2_to_car_transform");

	// initial ultrasonic sensor l2 pose with respect to the car
	ultrasonic_sensor_l2_to_car_pose.setOrigin(tf::Vector3(ultrasonic_sensor_l2_g.position.x, ultrasonic_sensor_l2_g.position.y, ultrasonic_sensor_l2_g.position.z));
	ultrasonic_sensor_l2_to_car_pose.setRotation(tf::Quaternion(ultrasonic_sensor_l2_g.orientation.yaw, ultrasonic_sensor_l2_g.orientation.pitch, ultrasonic_sensor_l2_g.orientation.roll));
	tf::StampedTransform ultrasonic_sensor_l2_to_car_transform(ultrasonic_sensor_l2_to_car_pose, tf::Time(0), "/car", "/ultrasonic_sensor_l2");
	tf_transformer.setTransform(ultrasonic_sensor_l2_to_car_transform, "ultrasonic_sensor_l2_to_car_transform");

	// initial ultrasonic sensor l1 pose with respect to the car
	ultrasonic_sensor_l1_to_car_pose.setOrigin(tf::Vector3(ultrasonic_sensor_l1_g.position.x, ultrasonic_sensor_l1_g.position.y, ultrasonic_sensor_l1_g.position.z));
	ultrasonic_sensor_l1_to_car_pose.setRotation(tf::Quaternion(ultrasonic_sensor_l1_g.orientation.yaw, ultrasonic_sensor_l1_g.orientation.pitch, ultrasonic_sensor_l1_g.orientation.roll));
	tf::StampedTransform ultrasonic_sensor_l1_to_car_transform(ultrasonic_sensor_l1_to_car_pose, tf::Time(0), "/car", "/ultrasonic_sensor_l1");
	tf_transformer.setTransform(ultrasonic_sensor_l1_to_car_transform, "ultrasonic_sensor_l1_to_car_transform");


}

void 
initialize_pose_6d_transformation_matrix()
{
	visual_odometry_pose_6d_transformation_matrix = Matrix::eye(4);

	tf::Transform board_to_camera_pose_g;
	tf::Transform car_to_board_pose;
	tf::Transform world_to_car_pose_g;
	tf::Transform camera_to_visual_odometry_transform;

	// initial car pose with respect to the world
	world_to_car_pose_g.setOrigin(tf::Vector3(car_pose_g.position.x, car_pose_g.position.y, car_pose_g.position.z));
	world_to_car_pose_g.setRotation(tf::Quaternion(car_pose_g.orientation.yaw, car_pose_g.orientation.pitch, car_pose_g.orientation.roll));
	tf::StampedTransform world_to_car_transform(world_to_car_pose_g, tf::Time(0), "/world", "/car");
	transformer.setTransform(world_to_car_transform, "world_to_car_transform");

	// board pose with respect to the car
	car_to_board_pose.setOrigin(tf::Vector3(sensor_board_pose_g.position.x, sensor_board_pose_g.position.y, sensor_board_pose_g.position.z));
	car_to_board_pose.setRotation(tf::Quaternion(sensor_board_pose_g.orientation.yaw, sensor_board_pose_g.orientation.pitch, sensor_board_pose_g.orientation.roll)); 				// yaw, pitch, roll
	tf::StampedTransform car_to_board_transform(car_to_board_pose, tf::Time(0), "/car", "/board");
	transformer.setTransform(car_to_board_transform, "car_to_board_transform");

	// camera pose with respect to the board
	board_to_camera_pose_g.setOrigin(tf::Vector3(camera_pose_g.position.x, camera_pose_g.position.y, camera_pose_g.position.z));
	board_to_camera_pose_g.setRotation(tf::Quaternion(camera_pose_g.orientation.yaw, camera_pose_g.orientation.pitch, camera_pose_g.orientation.roll)); 				// yaw, pitch, roll
	tf::StampedTransform board_to_camera_transform(board_to_camera_pose_g, tf::Time(0), "/board", "/camera");
	transformer.setTransform(board_to_camera_transform, "board_to_camera_transform");

	/**
	 * visual odometry pose with respect to the camera
	 * (the rotation comes from parent coordinate system (camera) to
	 * the child coordinate system (visual_odometry)) following yaw,
	 * pitch, roll angles order).
	 */
	camera_to_visual_odometry_transform.setOrigin(tf::Vector3(0.0, 0.0, 0.0)); // x, y, z;
	camera_to_visual_odometry_transform.setRotation(tf::Quaternion(-M_PI / 2.0, 0.0, -M_PI / 2.0));	// yaw, pitch, roll
	tf::StampedTransform camera_to_visual_odometry_stamped_transform(camera_to_visual_odometry_transform, tf::Time(0), "/camera", "/visual_odometry"); 	// create a time stamped transformation that defines the visual odometry position with respect to the camera
	transformer.setTransform(camera_to_visual_odometry_stamped_transform, "camera_to_visual_odometry_transform"); // add a link to the tf tree with the camera_to_visual_odometry_transform stamped transformation

	// get the transformation between the visual odometry coordinate system with respect to the carmen coordinate system.
	transformer.lookupTransform("/car", "/visual_odometry", tf::Time(0), g_car_to_visual_odometry_transform);
}

static void
initialize_transformations(xsens_xyz_handler *xsens_handler)
{
	tf::Time::init();

	tf::Transform xsens_position_on_board;	
	xsens_position_on_board.setOrigin(carmen_vector3_to_tf_vector3(xsens_handler->xsens_pose.position));
	xsens_position_on_board.setRotation(carmen_rotation_to_tf_quaternion(xsens_handler->xsens_pose.orientation));
	tf::StampedTransform board_to_xsens_transform(xsens_position_on_board, tf::Time(0), board_tf_name, xsens_tf_name);
	transformer.setTransform(board_to_xsens_transform, "board_to_xsens_transform");

	tf::Transform gps_position_on_board;	
	gps_position_on_board.setOrigin(carmen_vector3_to_tf_vector3(xsens_handler->gps_pose_in_the_car.position));
	gps_position_on_board.setRotation(carmen_rotation_to_tf_quaternion(xsens_handler->gps_pose_in_the_car.orientation));
	tf::StampedTransform board_to_gps_transform(gps_position_on_board, tf::Time(0), board_tf_name, gps_tf_name);
	transformer.setTransform(board_to_gps_transform, "board_to_gps_transform");

	tf::Transform board_position_on_car;	
	board_position_on_car.setOrigin(carmen_vector3_to_tf_vector3(xsens_handler->sensor_board_pose.position));
	board_position_on_car.setRotation(carmen_rotation_to_tf_quaternion(xsens_handler->sensor_board_pose.orientation));
	tf::StampedTransform car_to_board_transform(board_position_on_car, tf::Time(0), car_tf_name, board_tf_name);
	transformer.setTransform(car_to_board_transform, "car_to_board_transform");
}

void
initialize_transforms()
{//
	tf::Time::init();

	// initial car pose with respect to the world
	world_to_car_pose.setOrigin(tf::Vector3(car_pose.position.x, car_pose.position.y, car_pose.position.z));
	world_to_car_pose.setRotation(tf::Quaternion(car_pose.orientation.yaw, car_pose.orientation.pitch, car_pose.orientation.roll));
	tf::StampedTransform world_to_car_transform(world_to_car_pose, tf::Time(0), "/world", "/car");
	transformer.setTransform(world_to_car_transform, "world_to_car_transform");

	// board pose with respect to the car
	car_to_board_pose.setOrigin(tf::Vector3(sensor_board_1_pose.position.x, sensor_board_1_pose.position.y, sensor_board_1_pose.position.z));
	car_to_board_pose.setRotation(tf::Quaternion(sensor_board_1_pose.orientation.yaw, sensor_board_1_pose.orientation.pitch, sensor_board_1_pose.orientation.roll)); 				// yaw, pitch, roll
	tf::StampedTransform car_to_board_transform(car_to_board_pose, tf::Time(0), "/car", "/board");
	transformer.setTransform(car_to_board_transform, "car_to_board_transform");

	// velodyne pose with respect to the board
	board_to_velodyne_pose.setOrigin(tf::Vector3(velodyne_pose.position.x, velodyne_pose.position.y, velodyne_pose.position.z));
	board_to_velodyne_pose.setRotation(tf::Quaternion(velodyne_pose.orientation.yaw, velodyne_pose.orientation.pitch, velodyne_pose.orientation.roll)); 				// yaw, pitch, roll
	tf::StampedTransform board_to_velodyne_transform(board_to_velodyne_pose, tf::Time(0), "/board", "/velodyne");
	transformer.setTransform(board_to_velodyne_transform, "board_to_velodyne_transform");
}

static carmen_orientation_3D_t 
get_orientation_car_reference_from_message(tf::Quaternion xsens_reading)
{
	tf::StampedTransform xsens_to_car;
	transformer.lookupTransform(xsens_tf_name, car_tf_name, tf::Time(0), xsens_to_car);

	tf::Transform xsens_matrix;
	xsens_matrix.setOrigin(tf::Vector3(0.0, 0.0, 0.0));
	xsens_matrix.setRotation(xsens_reading);
	
	tf::Transform car_pose = xsens_matrix * xsens_to_car;
	
	carmen_orientation_3D_t orientation = get_carmen_orientation_from_tf_transform(car_pose);

	return orientation;
}

carmen_pose_3D_t
get_velodyne_pose_in_relation_to_car_helper(int argc, char** argv)
{	
	static int initialized = 0;

	if(initialized == 0)
	{
		initialize_carmen_parameters(argc, argv);
		initialize_transformations();

		initialized = 1;
	}

	tf::StampedTransform car_to_velodyne;
	transformer.lookupTransform(car_tf_name, velodyne_tf_name, tf::Time(0), car_to_velodyne);
	
	carmen_pose_3D_t velodyne_pose = tf_transform_to_carmen_pose_3D(car_to_velodyne);

	return velodyne_pose;
}

static carmen_vector_3D_t 
get_car_position_from_message(carmen_gps_xyz_message *gps_xyz_message)
{
	tf::StampedTransform gps_to_car;
	transformer.lookupTransform(gps_tf_name, car_tf_name, tf::Time(0), gps_to_car);
	
	carmen_vector_3D_t gps_position;
	gps_position.x = gps_xyz_message->x;
	gps_position.y = gps_xyz_message->y;
	gps_position.z = gps_xyz_message->z;

	tf::Transform global_to_gps;
	global_to_gps.setOrigin(carmen_vector3_to_tf_vector3(gps_position));
	tf::Quaternion zero_quat(0.0, 0.0, 0.0);
	global_to_gps.setRotation(zero_quat);
	
	tf::Transform global_to_car = global_to_gps * gps_to_car;

	carmen_vector_3D_t car_position = tf_vector3_to_carmen_vector3(global_to_car.getOrigin());
	
	return car_position;
}