robot.cpp

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/*
 * Copyright (c) 2008, Willow Garage, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Willow Garage, Inc. nor the names of its
 *       contributors may be used to endorse or promote products derived from
 *       this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "robot.h"
#include "robot_link.h"
#include "robot_joint.h"
#include "properties/property.h"
#include "properties/enum_property.h"
#include "properties/bool_property.h"
#include "display_context.h"

#include "ogre_helpers/object.h"
#include "ogre_helpers/shape.h"
#include "ogre_helpers/axes.h"

#include <urdf_model/model.h>

#include <OgreSceneNode.h>
#include <OgreSceneManager.h>
#include <OgreEntity.h>
#include <OgreMaterialManager.h>
#include <OgreMaterial.h>
#include <OgreResourceGroupManager.h>

#include <ros/console.h>
#include <ros/assert.h>

namespace rviz
{

Robot::Robot( Ogre::SceneNode* root_node, DisplayContext* context, const std::string& name, Property* parent_property )
  : scene_manager_( context->getSceneManager() )
  , visible_( true )
  , visual_visible_( true )
  , collision_visible_( false )
  , context_( context )
  , name_( name )
  , doing_set_checkbox_( false )
  , robot_loaded_( false )
  , inChangedEnableAllLinks( false )
{
  root_visual_node_ = root_node->createChildSceneNode();
  root_collision_node_ = root_node->createChildSceneNode();
  root_other_node_ = root_node->createChildSceneNode();

  link_factory_ = new LinkFactory();

  setVisualVisible( visual_visible_ );
  setCollisionVisible( collision_visible_ );
  setAlpha(1.0f);

  link_tree_ = new Property( "Links", QVariant(), "", parent_property );
  link_tree_->hide(); // hide until loaded

  link_tree_style_ = new EnumProperty(
                            "Link Tree Style",
                            "",
                            "How the list of links is displayed",
                            link_tree_,
                            SLOT( changedLinkTreeStyle() ),
                            this );
  initLinkTreeStyle();
  expand_tree_= new BoolProperty(
                            "Expand Tree",
                            false,
                            "Expand or collapse link tree",
                            link_tree_,
                            SLOT( changedExpandTree() ),
                            this );
  expand_link_details_ = new BoolProperty(
                            "Expand Link Details",
                            false,
                            "Expand link details (sub properties) to see all info for all links.",
                            link_tree_,
                            SLOT( changedExpandLinkDetails() ),
                            this );
  expand_joint_details_ = new BoolProperty(
                            "Expand Joint Details",
                            false,
                            "Expand joint details (sub properties) to see all info for all joints.",
                            link_tree_,
                            SLOT( changedExpandJointDetails() ),
                            this );
  enable_all_links_ = new BoolProperty(
                            "All Links Enabled",
                            true,
                            "Turn all links on or off.",
                            link_tree_,
                            SLOT( changedEnableAllLinks() ),
                            this );
}

Robot::~Robot()
{
  clear();

  scene_manager_->destroySceneNode( root_visual_node_->getName() );
  scene_manager_->destroySceneNode( root_collision_node_->getName() );
  scene_manager_->destroySceneNode( root_other_node_->getName() );
  delete link_factory_;
}

void Robot::setLinkFactory(LinkFactory *link_factory)
{
  if (link_factory)
  {
    delete link_factory_;
    link_factory_ = link_factory;
  }
}

void Robot::setVisible( bool visible )
{
  visible_ = visible;
  if ( visible )
  {
    root_visual_node_->setVisible( visual_visible_ );
    root_collision_node_->setVisible( collision_visible_ );
    updateLinkVisibilities();
  }
  else
  {
    root_visual_node_->setVisible( false );
    root_collision_node_->setVisible( false );
    updateLinkVisibilities();
  }
}

void Robot::setVisualVisible( bool visible )
{
  visual_visible_ = visible;
  updateLinkVisibilities();
}

void Robot::setCollisionVisible( bool visible )
{
  collision_visible_ = visible;
  updateLinkVisibilities();
}

void Robot::updateLinkVisibilities()
{
  M_NameToLink::iterator it = links_.begin();
  M_NameToLink::iterator end = links_.end();
  for ( ; it != end; ++it )
  {
    RobotLink* link = it->second;
    link->updateVisibility();
  }
}

bool Robot::isVisible()
{
  return visible_;
}

bool Robot::isVisualVisible()
{
  return visual_visible_;
}

bool Robot::isCollisionVisible()
{
  return collision_visible_;
}

void Robot::setAlpha(float a)
{
  alpha_ = a;

  M_NameToLink::iterator it = links_.begin();
  M_NameToLink::iterator end = links_.end();
  for ( ; it != end; ++it )
  {
    RobotLink* link = it->second;

    link->setRobotAlpha(alpha_);
  }
}

void Robot::clear()
{
  // unparent all link and joint properties so they can be deleted in arbitrary
  // order without being delete by their parent propeties (which vary based on
  // style)
  unparentLinkProperties();

  M_NameToLink::iterator link_it = links_.begin();
  M_NameToLink::iterator link_end = links_.end();
  for ( ; link_it != link_end; ++link_it )
  {
    RobotLink* link = link_it->second;
    delete link;
  }

  M_NameToJoint::iterator joint_it = joints_.begin();
  M_NameToJoint::iterator joint_end = joints_.end();
  for ( ; joint_it != joint_end; ++joint_it )
  {
    RobotJoint* joint = joint_it->second;
    delete joint;
  }

  links_.clear();
  joints_.clear();
  root_visual_node_->removeAndDestroyAllChildren();
  root_collision_node_->removeAndDestroyAllChildren();
  root_other_node_->removeAndDestroyAllChildren();
}

RobotLink* Robot::LinkFactory::createLink(
    Robot* robot,
    const boost::shared_ptr<const urdf::Link>& link,
    const std::string& parent_joint_name,
    bool visual,
    bool collision)
{
  return new RobotLink(robot, link, parent_joint_name, visual, collision);
}

RobotJoint* Robot::LinkFactory::createJoint(
    Robot* robot,
    const boost::shared_ptr<const urdf::Joint>& joint)
{
  return new RobotJoint(robot, joint);
}

void Robot::load( const urdf::ModelInterface &urdf, bool visual, bool collision )
{
  link_tree_->hide(); // hide until loaded
  robot_loaded_ = false;

  // clear out any data (properties, shapes, etc) from a previously loaded robot.
  clear();

  // the root link is discovered below.  Set to NULL until found.
  root_link_ = NULL;

  // Create properties for each link.
  // Properties are not added to display until changedLinkTreeStyle() is called (below).
  {
    typedef std::map<std::string, boost::shared_ptr<urdf::Link> > M_NameToUrdfLink;
    M_NameToUrdfLink::const_iterator link_it = urdf.links_.begin();
    M_NameToUrdfLink::const_iterator link_end = urdf.links_.end();
    for( ; link_it != link_end; ++link_it )
    {
      const boost::shared_ptr<const urdf::Link>& urdf_link = link_it->second;
      std::string parent_joint_name;

      if (urdf_link != urdf.getRoot() && urdf_link->parent_joint)
      {
        parent_joint_name = urdf_link->parent_joint->name;
      }
      
      RobotLink* link = link_factory_->createLink( this,
                                                   urdf_link,
                                                   parent_joint_name,
                                                   visual,
                                                   collision );

      if (urdf_link == urdf.getRoot())
      {
        root_link_ = link;
      }

      links_[urdf_link->name] = link;

      link->setRobotAlpha( alpha_ );
    }
  }

  // Create properties for each joint.
  // Properties are not added to display until changedLinkTreeStyle() is called (below).
  {
    typedef std::map<std::string, boost::shared_ptr<urdf::Joint> > M_NameToUrdfJoint;
    M_NameToUrdfJoint::const_iterator joint_it = urdf.joints_.begin();
    M_NameToUrdfJoint::const_iterator joint_end = urdf.joints_.end();
    for( ; joint_it != joint_end; ++joint_it )
    {
      const boost::shared_ptr<const urdf::Joint>& urdf_joint = joint_it->second;
      RobotJoint* joint = link_factory_->createJoint( this, urdf_joint );

      joints_[urdf_joint->name] = joint;

      joint->setRobotAlpha( alpha_ );
    }
  }

  // robot is now loaded
  robot_loaded_ = true;
  link_tree_->show();

  // set the link tree style and add link/joint properties to rviz pane.
  setLinkTreeStyle(LinkTreeStyle(link_tree_style_->getOptionInt()));
  changedLinkTreeStyle();

  // at startup the link tree is collapsed since it is large and not often needed.
  link_tree_->collapse();

  setVisualVisible( isVisualVisible() );
  setCollisionVisible( isCollisionVisible() );
}

void Robot::unparentLinkProperties()
{
  // remove link properties from their parents
  M_NameToLink::iterator link_it = links_.begin();
  M_NameToLink::iterator link_end = links_.end();
  for ( ; link_it != link_end ; ++link_it )
  {
    link_it->second->setParentProperty(NULL);
  }

  // remove joint properties from their parents
  M_NameToJoint::iterator joint_it = joints_.begin();
  M_NameToJoint::iterator joint_end = joints_.end();
  for ( ; joint_it != joint_end ; ++joint_it )
  {
    joint_it->second->setParentProperty(NULL);
  }
}

void Robot::useDetailProperty(bool use_detail)
{
  // remove sub properties and add them to detail
  M_NameToLink::iterator link_it = links_.begin();
  M_NameToLink::iterator link_end = links_.end();
  for ( ; link_it != link_end ; ++link_it )
  {
    link_it->second->useDetailProperty(use_detail);
  }

  // remove joint properties from their parents
  M_NameToJoint::iterator joint_it = joints_.begin();
  M_NameToJoint::iterator joint_end = joints_.end();
  for ( ; joint_it != joint_end ; ++joint_it )
  {
    joint_it->second->useDetailProperty(use_detail);
  }
}

void Robot::changedExpandTree()
{
  bool expand = expand_tree_->getBool();

  M_NameToLink::iterator link_it = links_.begin();
  M_NameToLink::iterator link_end = links_.end();
  for ( ; link_it != link_end ; ++link_it )
  {
    if (expand)
      link_it->second->getLinkProperty()->expand();
    else
      link_it->second->getLinkProperty()->collapse();
  }

  M_NameToJoint::iterator joint_it = joints_.begin();
  M_NameToJoint::iterator joint_end = joints_.end();
  for ( ; joint_it != joint_end ; ++joint_it )
  {
    if (expand)
      joint_it->second->getJointProperty()->expand();
    else
      joint_it->second->getJointProperty()->collapse();
  }
}

void Robot::changedHideSubProperties()
{
  bool hide = /* !show_details_->getBool(); */ false;

  M_NameToLink::iterator link_it = links_.begin();
  M_NameToLink::iterator link_end = links_.end();
  for ( ; link_it != link_end ; ++link_it )
  {
    link_it->second->hideSubProperties(hide);
  }

  M_NameToJoint::iterator joint_it = joints_.begin();
  M_NameToJoint::iterator joint_end = joints_.end();
  for ( ; joint_it != joint_end ; ++joint_it )
  {
    joint_it->second->hideSubProperties(hide);
  }
}

void Robot::changedExpandLinkDetails()
{
  bool expand = expand_link_details_->getBool();

  M_NameToLink::iterator link_it = links_.begin();
  M_NameToLink::iterator link_end = links_.end();
  for ( ; link_it != link_end ; ++link_it )
  {
    link_it->second->expandDetails(expand);
  }
}

void Robot::changedExpandJointDetails()
{
  bool expand = expand_joint_details_->getBool();

  M_NameToJoint::iterator joint_it = joints_.begin();
  M_NameToJoint::iterator joint_end = joints_.end();
  for ( ; joint_it != joint_end ; ++joint_it )
  {
    joint_it->second->expandDetails(expand);
  }
}

void Robot::changedEnableAllLinks()
{
  if (doing_set_checkbox_)
    return;

  bool enable = enable_all_links_->getBool();

  inChangedEnableAllLinks = true;

  M_NameToLink::iterator link_it = links_.begin();
  M_NameToLink::iterator link_end = links_.end();
  for ( ; link_it != link_end ; ++link_it )
  {
    if (link_it->second->hasGeometry())
    {
      link_it->second->getLinkProperty()->setValue(enable);
    }
  }

  M_NameToJoint::iterator joint_it = joints_.begin();
  M_NameToJoint::iterator joint_end = joints_.end();
  for ( ; joint_it != joint_end ; ++joint_it )
  {
    if (joint_it->second->hasDescendentLinksWithGeometry())
    {
      joint_it->second->getJointProperty()->setValue(enable);
    }
  }

  inChangedEnableAllLinks = false;
}

void Robot::setEnableAllLinksCheckbox(QVariant val)
{
  // doing_set_checkbox_ prevents changedEnableAllLinks from turning all
  // links off when we modify the enable_all_links_ property.
  doing_set_checkbox_ = true;
  enable_all_links_->setValue(val);
  doing_set_checkbox_ = false;
}

void Robot::initLinkTreeStyle()
{
  style_name_map_.clear();
        style_name_map_[STYLE_LINK_LIST] = "Links in Alphabetic Order";
        style_name_map_[STYLE_JOINT_LIST] = "Joints in Alphabetic Order";
        style_name_map_[STYLE_LINK_TREE] = "Tree of links";
        style_name_map_[STYLE_JOINT_LINK_TREE] = "Tree of links and joints";

  link_tree_style_->clearOptions();
  std::map<LinkTreeStyle, std::string>::const_iterator style_it = style_name_map_.begin();
  std::map<LinkTreeStyle, std::string>::const_iterator style_end = style_name_map_.end();
  for ( ; style_it != style_end ; ++style_it )
  {
    link_tree_style_->addOptionStd( style_it->second, style_it->first );
  }
}

bool Robot::styleShowLink(LinkTreeStyle style)
{
  return 
    style == STYLE_LINK_LIST ||
    style == STYLE_LINK_TREE ||
    style == STYLE_JOINT_LINK_TREE;
}

bool Robot::styleShowJoint(LinkTreeStyle style)
{
  return 
    style == STYLE_JOINT_LIST ||
    style == STYLE_JOINT_LINK_TREE;
}

bool Robot::styleIsTree(LinkTreeStyle style)
{
  return 
    style == STYLE_LINK_TREE ||
    style == STYLE_JOINT_LINK_TREE;
}

void Robot::setLinkTreeStyle(LinkTreeStyle style)
{
  std::map<LinkTreeStyle, std::string>::const_iterator style_it = style_name_map_.find(style);
  if (style_it == style_name_map_.end())
    link_tree_style_->setValue(style_name_map_[STYLE_DEFAULT].c_str());
  else
    link_tree_style_->setValue(style_it->second.c_str());
}

// insert properties into link_tree_ according to style
void Robot::changedLinkTreeStyle()
{
  if (!robot_loaded_)
    return;

  LinkTreeStyle style = LinkTreeStyle(link_tree_style_->getOptionInt());

  unparentLinkProperties();

  //expand_tree_->setValue(false);

  switch (style)
  {
  case STYLE_LINK_TREE:
  case STYLE_JOINT_LINK_TREE:
    useDetailProperty(true);
    if (root_link_)
    {
      addLinkToLinkTree(style, link_tree_, root_link_);
    }
    break;

  case STYLE_JOINT_LIST:
  {
    useDetailProperty(false);
    M_NameToJoint::iterator joint_it = joints_.begin();
    M_NameToJoint::iterator joint_end = joints_.end();
    for ( ; joint_it != joint_end ; ++joint_it )
    {
      joint_it->second->setParentProperty(link_tree_);
      joint_it->second->setJointPropertyDescription();
    }
    break;
  }

  case STYLE_LINK_LIST:
  default:
    useDetailProperty(false);
    M_NameToLink::iterator link_it = links_.begin();
    M_NameToLink::iterator link_end = links_.end();
    for ( ; link_it != link_end ; ++link_it )
    {
      link_it->second->setParentProperty(link_tree_);
    }
    break;
  }

  switch (style)
  {
  case STYLE_LINK_TREE:
    link_tree_->setName("Link Tree");
    link_tree_->setDescription("A tree of all links in the robot.  Uncheck a link to hide its geometry.");
    expand_tree_->show();
    expand_link_details_->show();
    expand_joint_details_->hide();
    break;
  case STYLE_JOINT_LINK_TREE:
    link_tree_->setName("Link/Joint Tree");
    link_tree_->setDescription("A tree of all joints and links in the robot.  Uncheck a link to hide its geometry.");
    expand_tree_->show();
    expand_link_details_->show();
    expand_joint_details_->show();
    break;
  case STYLE_JOINT_LIST:
    link_tree_->setName("Joints");
    link_tree_->setDescription("All joints in the robot in alphabetic order.");
    expand_tree_->hide();
    expand_link_details_->hide();
    expand_joint_details_->show();
    break;
  case STYLE_LINK_LIST:
  default:
    link_tree_->setName("Links");
    link_tree_->setDescription("All links in the robot in alphabetic order.  Uncheck a link to hide its geometry.");
    expand_tree_->hide();
    expand_link_details_->show();
    expand_joint_details_->hide();
    break;
  }

  expand_link_details_->setValue(false);
  expand_joint_details_->setValue(false);
  expand_tree_->setValue(false);
  calculateJointCheckboxes();
}


// recursive helper for setLinkTreeStyle() when style is *_TREE
void Robot::addLinkToLinkTree(LinkTreeStyle style, Property *parent, RobotLink *link)
{
  if (styleShowLink(style))
  {
    link->setParentProperty(parent);
    parent = link->getLinkProperty();
  }

  std::vector<std::string>::const_iterator child_joint_it = link->getChildJointNames().begin();
  std::vector<std::string>::const_iterator child_joint_end = link->getChildJointNames().end();
  for ( ; child_joint_it != child_joint_end ; ++child_joint_it )
  {
    RobotJoint* child_joint = getJoint( *child_joint_it );
    if (child_joint)
    {
      addJointToLinkTree(style, parent, child_joint);
    }
  }
}

// recursive helper for setLinkTreeStyle() when style is *_TREE
void Robot::addJointToLinkTree(LinkTreeStyle style, Property *parent, RobotJoint *joint)
{
  if (styleShowJoint(style))
  {
    joint->setParentProperty(parent);
    parent = joint->getJointProperty();
    joint->setJointPropertyDescription();
  }

  RobotLink *link = getLink( joint->getChildLinkName() );
  if (link)
  {
    addLinkToLinkTree(style, parent, link);
  }
}

RobotLink* Robot::getLink( const std::string& name )
{
  M_NameToLink::iterator it = links_.find( name );
  if ( it == links_.end() )
  {
    ROS_WARN( "Link [%s] does not exist", name.c_str() );
    return NULL;
  }

  return it->second;
}

RobotJoint* Robot::getJoint( const std::string& name )
{
  M_NameToJoint::iterator it = joints_.find( name );
  if ( it == joints_.end() )
  {
    ROS_WARN( "Joint [%s] does not exist", name.c_str() );
    return NULL;
  }

  return it->second;
}

void Robot::calculateJointCheckboxes()
{
  if (inChangedEnableAllLinks || !robot_loaded_)
    return;

  int links_with_geom_checked = 0;
  int links_with_geom_unchecked = 0;

  // check root link
  RobotLink *link = root_link_;
  if (link && link->hasGeometry())
  {
    bool checked = link->getLinkProperty()->getValue().toBool();
    links_with_geom_checked += checked ? 1 : 0;
    links_with_geom_unchecked += checked ? 0 : 1;
  }
  int links_with_geom = links_with_geom_checked + links_with_geom_unchecked;

  // check all child links and joints recursively
  std::vector<std::string>::const_iterator child_joint_it = link->getChildJointNames().begin();
  std::vector<std::string>::const_iterator child_joint_end = link->getChildJointNames().end();
  for ( ; child_joint_it != child_joint_end ; ++child_joint_it )
  {
    RobotJoint* child_joint = getJoint( *child_joint_it );
    if (child_joint)
    {
      int child_links_with_geom;
      int child_links_with_geom_checked;
      int child_links_with_geom_unchecked;
      child_joint->calculateJointCheckboxesRecursive(child_links_with_geom, child_links_with_geom_checked, child_links_with_geom_unchecked);
      links_with_geom_checked += child_links_with_geom_checked;
      links_with_geom_unchecked += child_links_with_geom_unchecked;
    }
  }
  links_with_geom = links_with_geom_checked + links_with_geom_unchecked;

  if (!links_with_geom)
  {
    setEnableAllLinksCheckbox(QVariant());
  }
  else
  {
    setEnableAllLinksCheckbox(links_with_geom_unchecked == 0);
  }
}

void Robot::update(const LinkUpdater& updater)
{
  M_NameToLink::iterator link_it = links_.begin();
  M_NameToLink::iterator link_end = links_.end();
  for ( ; link_it != link_end; ++link_it )
  {
    RobotLink* link = link_it->second;

    link->setToNormalMaterial();

    Ogre::Vector3 visual_position, collision_position;
    Ogre::Quaternion visual_orientation, collision_orientation;
    if( updater.getLinkTransforms( link->getName(),
                                   visual_position, visual_orientation,
                                   collision_position, collision_orientation
                                   ))
    {
      // Check if visual_orientation, visual_position, collision_orientation, and collision_position are NaN.
      if (visual_orientation.isNaN())
      {
        ROS_ERROR_THROTTLE(
          1.0,
          "visual orientation of %s contains NaNs. Skipping render as long as the orientation is invalid.",
          link->getName().c_str()
        );
        continue;
      }
      if (visual_position.isNaN())
      {
        ROS_ERROR_THROTTLE(
          1.0,
          "visual position of %s contains NaNs. Skipping render as long as the position is invalid.",
          link->getName().c_str()
        );
        continue;
      }
      if (collision_orientation.isNaN())
      {
        ROS_ERROR_THROTTLE(
          1.0,
          "collision orientation of %s contains NaNs. Skipping render as long as the orientation is invalid.",
          link->getName().c_str()
        );
        continue;
      }
      if (collision_position.isNaN())
      {
        ROS_ERROR_THROTTLE(
          1.0,
          "collision position of %s contains NaNs. Skipping render as long as the position is invalid.",
          link->getName().c_str()
        );
        continue;
      }
      link->setTransforms( visual_position, visual_orientation, collision_position, collision_orientation );

      std::vector<std::string>::const_iterator joint_it = link->getChildJointNames().begin();
      std::vector<std::string>::const_iterator joint_end = link->getChildJointNames().end();
      for ( ; joint_it != joint_end ; ++joint_it )
      {
        RobotJoint *joint = getJoint(*joint_it);
        if (joint)
        {
          joint->setTransforms(visual_position, visual_orientation);
        }
      }
    }
    else
    {
      link->setToErrorMaterial();
    }
  }
}

void Robot::setPosition( const Ogre::Vector3& position )
{
  root_visual_node_->setPosition( position );
  root_collision_node_->setPosition( position );
}

void Robot::setOrientation( const Ogre::Quaternion& orientation )
{
  root_visual_node_->setOrientation( orientation );
  root_collision_node_->setOrientation( orientation );
}

void Robot::setScale( const Ogre::Vector3& scale )
{
  root_visual_node_->setScale( scale );
  root_collision_node_->setScale( scale );
}

const Ogre::Vector3& Robot::getPosition()
{
  return root_visual_node_->getPosition();
}

const Ogre::Quaternion& Robot::getOrientation()
{
  return root_visual_node_->getOrientation();
}

} // namespace rviz