示例#1
0
bool framesFromKDLTree(const KDL::Tree& tree,
                       std::vector<std::string>& framesNames,
                       std::vector<std::string>& parentLinkNames)
{
    framesNames.clear();
    parentLinkNames.clear();

    KDL::SegmentMap::iterator seg;
    KDL::SegmentMap segs;
    KDL::SegmentMap::const_iterator root_seg;
    root_seg = tree.getRootSegment();
    segs = tree.getSegments();
    for( seg = segs.begin(); seg != segs.end(); seg++ )
    {
        if( GetTreeElementChildren(seg->second).size() == 0 &&
            GetTreeElementSegment(seg->second).getJoint().getType() == KDL::Joint::None &&
            GetTreeElementSegment(seg->second).getInertia().getMass() == 0.0 )
        {
            std::string frameName = GetTreeElementSegment(seg->second).getName();
            std::string parentLinkName = GetTreeElementSegment(GetTreeElementParent(seg->second)->second).getName();
            framesNames.push_back(frameName);
            parentLinkNames.push_back(parentLinkName);

            //also check parent
            KDL::Segment parent = GetTreeElementSegment(GetTreeElementParent(seg->second)->second);
            if (parent.getJoint().getType() == KDL::Joint::None &&
                parent.getInertia().getMass() == 0.0)
            {
                framesNames.push_back(parentLinkName);
            }
        }
    }

    return true;
}
示例#2
0
bool treeToUrdfModel(const KDL::Tree& tree, const std::string & robot_name, urdf::ModelInterface& robot_model)
{
    robot_model.clear();
    robot_model.name_ = robot_name;

    //Add all links
    KDL::SegmentMap::iterator seg;
    KDL::SegmentMap segs;
    KDL::SegmentMap::const_iterator root_seg;
    root_seg = tree.getRootSegment();
    segs = tree.getSegments();
    for( seg = segs.begin(); seg != segs.end(); seg++ ) {
        if (robot_model.getLink(seg->first))
        {
            std::cerr << "[ERR] link " << seg->first << " is not unique." << std::endl;
            robot_model.clear();
            return false;
        }
        else
        {
            urdf::LinkPtr link;
            resetPtr(link, new urdf::Link);

            //add name
            link->name = seg->first;

            //insert link
            robot_model.links_.insert(make_pair(seg->first,link));
            std::cerr << "[DEBUG] successfully added a new link " << link->name << std::endl;
        }

        //inserting joint
        //The fake root segment has no joint to add
        if( seg->first != root_seg->first ) {
            KDL::Joint jnt;
            jnt = GetTreeElementSegment(seg->second).getJoint();
            if (robot_model.getJoint(jnt.getName()))
            {
                std::cerr << "[ERR] joint " <<  jnt.getName() << " is not unique." << std::endl;
                robot_model.clear();
                return false;
            }
            else
            {
                urdf::JointPtr joint;
                urdf::LinkPtr link = robot_model.links_[seg->first];
                //This variable will be set by toUrdf
                KDL::Frame H_new_old_successor;
                KDL::Frame H_new_old_predecessor = getH_new_old(GetTreeElementSegment(GetTreeElementParent(seg->second)->second));
                urdf::resetPtr(joint, new urdf::Joint());

                //convert joint
                *joint = toUrdf(jnt, GetTreeElementSegment(seg->second).getFrameToTip(),H_new_old_predecessor,H_new_old_successor);

                //insert parent
                joint->parent_link_name = GetTreeElementParent(seg->second)->first;

                //insert child
                joint->child_link_name = seg->first;

                //insert joint
                robot_model.joints_.insert(make_pair(seg->first,joint));
                std::cerr << "[DEBUG] successfully added a new joint" << jnt.getName() << std::endl;

                //add inertial, taking in account an eventual change in the link frame
                resetPtr(link->inertial, new urdf::Inertial());
                *(link->inertial) = toUrdf(H_new_old_successor * GetTreeElementSegment(seg->second).getInertia());
            }
        }

    }

    // every link has children links and joints, but no parents, so we create a
    // local convenience data structure for keeping child->parent relations
    std::map<std::string, std::string> parent_link_tree;
    parent_link_tree.clear();

    // building tree: name mapping
    //try
    //{
        robot_model.initTree(parent_link_tree);
    //}
    /*
    catch(ParseError &e)
    {
        logError("Failed to build tree: %s", e.what());
        robot_model.clear();
        return false;
    }*/

    // find the root link
    //try
    //{
        robot_model.initRoot(parent_link_tree);
    //}
    /*
    catch(ParseError &e)
    {
        logError("Failed to find root link: %s", e.what());
        robot_model.reset();
        return false;
    }
    */
    return true;
}
示例#3
0
bool leatherman::getSegmentOfJoint(const KDL::Tree &tree, std::string joint, std::string &segment)
{ 
  KDL::SegmentMap smap = tree.getSegments();
  for(std::map<std::string, KDL::TreeElement>::const_iterator iter = smap.begin(); iter != smap.end(); ++iter)
  { 
    if(iter->second.segment.getJoint().getName().compare(joint) == 0)
    { 
      segment = iter->second.segment.getName();
      return true;
    }
  }
  return false;
}
void TransformationCalculator::load_robot_model(std::string filepath, bool init_invalid){
    clear_all();

    bool success=false;
    success = kdl_parser::treeFromFile(filepath, kdl_tree_);
    if(!success){
        is_initialized_ = false;
        throw("Could not load Model file");
    }

    //Extract names of all joints defined in urdf file.
    //These are the names that are expected to be referred to in update function.
    KDL::SegmentMap map = kdl_tree_.getSegments();
    std::string root_name = kdl_tree_.getRootSegment()->first;

    KDL::Joint joint;
    KDL::Segment segment;
    for(KDL::SegmentMap::const_iterator it = map.begin(); it!=map.end(); ++it){
#ifdef KDL_USE_NEW_TREE_INTERFACE
        segment = it->second->segment;
#else
        segment = it->second.segment;
#endif
        joint = segment.getJoint();
        std::string j_name = joint.getName();

        if(j_name == "NoName" || j_name == ""){
            if(segment.getName() != root_name){
                LOG_ERROR("Segment %s has an unnamed joint. This is not okay, but will skip it for now.", segment.getName().c_str());
            }
            LOG_DEBUG("Skipping NonName joint of root segment");
            continue;
        }

        if(is_fixed(joint)){
            if(std::find(static_joint_names_.begin(), static_joint_names_.end(), j_name) == static_joint_names_.end()){
                static_segment_names_.push_back(segment.getName());
                static_joint_names_.push_back(j_name);
                joint_name2seg_name_[j_name] = segment.getName();
                all_joint_names_.push_back(j_name);
            }
        }
        if(is_valid_joint(joint)){
            if(std::find(moving_joint_names_.begin(), moving_joint_names_.end(), j_name) == moving_joint_names_.end()){
                moving_joint_names_.push_back(j_name);
                joint_name2seg_name_[j_name] = segment.getName();
                all_joint_names_.push_back(j_name);
            }
        }

    }
    //link_names_ = extract_keys(map);

    //Populate transforms map with identity transforms
    for(std::vector<std::string>::iterator it = moving_joint_names_.begin();
        it != moving_joint_names_.end(); ++it)
    {
        std::string j_name = *it;
        std::string seg_name = joint_name2seg_name_[j_name];
        moving_joints_transforms_[j_name] = base::samples::RigidBodyState(true);
        if(!init_invalid){
            //initUnknow sets trasform to identity. If we donÄt want invalidating, set to identity.
            moving_joints_transforms_[j_name].initUnknown();
        }
        moving_joints_transforms_[j_name].sourceFrame = seg_name;
#ifdef KDL_USE_NEW_TREE_INTERFACE
        moving_joints_transforms_[j_name].targetFrame = get_tree_element(seg_name).parent->second->segment.getName();
#else
        moving_joints_transforms_[j_name].targetFrame = get_tree_element(seg_name).parent->second.segment.getName();
#endif
    }

    //Populate static transforms vector
    for(uint i=0; i<static_joint_names_.size(); i++){
        std::string seg_name = static_segment_names_[i];
        KDL::TreeElement tree_elem = get_tree_element(seg_name);
        KDL::Frame kdl_transform = tree_elem.segment.pose(0);
        std::string j_name = static_joint_names_[i];
        base::samples::RigidBodyState rbs;
        convert(kdl_transform, rbs);
        //Skip root
        if(tree_elem.segment.getName() == kdl_tree_.getRootSegment()->first){
            continue;
        }
#ifdef KDL_USE_NEW_TREE_INTERFACE
        rbs.sourceFrame = tree_elem.parent->second->segment.getName();
#else
        rbs.sourceFrame = tree_elem.parent->second.segment.getName();
#endif
        rbs.targetFrame = tree_elem.segment.getName();
        static_joints_transforms_[j_name] = rbs;
    }


    is_initialized_ = true;
}
bool TreeKinematics::readJoints(urdf::Model &robot_model,
                                KDL::Tree &kdl_tree,
                                std::string &tree_root_name,
                                unsigned int &nr_of_jnts,
                                KDL::JntArray &joint_min,
                                KDL::JntArray &joint_max,
                                KDL::JntArray &joint_vel_max)
{
  KDL::SegmentMap segmentMap;
  segmentMap = kdl_tree.getSegments();
  tree_root_name = kdl_tree.getRootSegment()->second.segment.getName();
  nr_of_jnts = kdl_tree.getNrOfJoints();
  ROS_DEBUG( "the tree's number of joints: [%d]", nr_of_jnts );
  joint_min.resize(nr_of_jnts);
  joint_max.resize(nr_of_jnts);
  joint_vel_max.resize(nr_of_jnts);
  info_.joint_names.resize(nr_of_jnts);
  info_.limits.resize(nr_of_jnts);

  // The following walks through all tree segments, extracts their joints except joints of KDL::None and extracts
  // the information about min/max position and max velocity of the joints not of type urdf::Joint::UNKNOWN or
  // urdf::Joint::FIXED
  ROS_DEBUG("Extracting all joints from the tree, which are not of type KDL::Joint::None.");
  boost::shared_ptr<const urdf::Joint> joint;
  for (KDL::SegmentMap::const_iterator seg_it = segmentMap.begin(); seg_it != segmentMap.end(); ++seg_it)
  {
    if (seg_it->second.segment.getJoint().getType() != KDL::Joint::None)
    {
      // check, if joint can be found in the URDF model of the robot
      joint = robot_model.getJoint(seg_it->second.segment.getJoint().getName().c_str());
      if (!joint)
      {
        ROS_FATAL("Joint '%s' has not been found in the URDF robot model!", joint->name.c_str());
        return false;
      }
      // extract joint information
      if (joint->type != urdf::Joint::UNKNOWN && joint->type != urdf::Joint::FIXED)
      {
        ROS_DEBUG( "getting information about joint: [%s]", joint->name.c_str() );
        double lower = 0.0, upper = 0.0, vel_limit = 0.0;
        unsigned int has_pos_limits = 0, has_vel_limits = 0;

        if ( joint->type != urdf::Joint::CONTINUOUS )
        {
          ROS_DEBUG("joint is not continuous.");
          lower = joint->limits->lower;
          upper = joint->limits->upper;
          has_pos_limits = 1;
          if (joint->limits->velocity)
          {
            has_vel_limits = 1;
            vel_limit = joint->limits->velocity;
            ROS_DEBUG("joint has following velocity limit: %f", vel_limit);
          }
          else
          {
            has_vel_limits = 0;
            vel_limit = 0.0;
            ROS_DEBUG("joint has no velocity limit.");
          }
        }
        else
        {
          ROS_DEBUG("joint is continuous.");
          lower = -M_PI;
          upper = M_PI;
          has_pos_limits = 0;
          if(joint->limits && joint->limits->velocity)
          {
            has_vel_limits = 1;
            vel_limit = joint->limits->velocity;
            ROS_DEBUG("joint has following velocity limit: %f", vel_limit);
          }
          else
          {
            has_vel_limits = 0;
            vel_limit = 0.0;
            ROS_DEBUG("joint has no velocity limit.");
          }
        }

        joint_min(seg_it->second.q_nr) = lower;
        joint_max(seg_it->second.q_nr) = upper;
        joint_vel_max(seg_it->second.q_nr) = vel_limit;
        ROS_DEBUG("pos_min = %f, pos_max = %f, vel_max = %f", lower, upper, vel_limit);

        info_.joint_names[seg_it->second.q_nr] = joint->name;
        info_.limits[seg_it->second.q_nr].joint_name = joint->name;
        info_.limits[seg_it->second.q_nr].has_position_limits = has_pos_limits;
        info_.limits[seg_it->second.q_nr].min_position = lower;
        info_.limits[seg_it->second.q_nr].max_position = upper;
        info_.limits[seg_it->second.q_nr].has_velocity_limits = has_vel_limits;
        info_.limits[seg_it->second.q_nr].max_velocity = vel_limit;
      }
    }
  }
  return true;
}