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2012-11-27 20:16:46 -0500 answered a question Relation between cmd_vel and odometry twist data?

i also have this problem. i think linearV = (odom.twist.twist.linear.x); is the velocity of the robot, but observing the data obtained it isn't like that. So i confused if i am wrong? why?

2012-11-22 22:14:33 -0500 received badge  Popular Question (source)
2012-11-12 18:24:50 -0500 answered a question simulation the summit rover in ros?

i solved the problem, but the new problem comes. I start a empty gazebo, and want to join in the summit xl.urdf to simulate the rover in gazebo. Here are the results: Msg Connected to gazebo master @ http://localhost:11345 LightListWidget::OnLightMsg Warning [parser.cc:348] Gazebo SDF has no gazebo element Warning [parser.cc:291] DEPRECATED GAZEBO MODEL FILE On July 1st, 2012, this formate will no longer by supported Convert your files using the gzsdf command line tool You have been warned!

Error [MeshManager.cc:84] Invalid mesh filename extension[/home/nico/fuerte_workspace/sandbox/summit_xl_sim/summit_xl_description/meshes/summit_xl_chassis_cam1.mesh] Exception [Visual.cc:1427] Unable to create a mesh from /home/nico/fuerte_workspace/sandbox/summit_xl_sim/summit_xl_description/meshes/summit_xl_chassis_cam1.mesh

Qt has caught an exception thrown from an event handler. Throwing exceptions from an event handler is not supported in Qt. You must reimplement QApplication::notify() and catch all exceptions there.

terminate called after throwing an instance of 'gazebo::common::Exception' Error [Plugin.hh:101] Failed to load plugin libgazebo_ros_time.so: libgazebo_ros_time.so: cannot open shared object file: No such file or directory Dbg plugin model name: summit_xl /opt/ros/fuerte/stacks/simulator_gazebo/gazebo/scripts/gui: 行 2: 11049 已放弃 (核心已转储) rospack find gazebo/gazebo/bin/gzclient -g rospack find gazebo/lib/libgazebo_ros_paths_plugin.so [gazebo_gui-2] process has died [pid 11046, exit code 134, cmd /opt/ros/fuerte/stacks/simulator_gazebo/gazebo/scripts/gui __name:=gazebo_gui __log:=/home/nico/.ros/log/eb4b8668-2d55-11e2-8cc9-001f3c927c3f/gazebo_gui-2.log]. log file: /home/nico/.ros/log/eb4b8668-2d55-11e2-8cc9-001f3c927c3f/gazebo_gui-2.log Error [MeshManager.cc:84] Invalid mesh filename extension[/home/nico/fuerte_workspace/sandbox/summit_xl_sim/summit_xl_description/meshes/summit_xl_chassis_cam1.mesh] Segmentation fault (core dumped) [gazebo-1] process has died [pid 11039, exit code 139, cmd /opt/ros/fuerte/stacks/simulator_gazebo/gazebo/scripts/gazebo /opt/ros/fuerte/stacks/simulator_gazebo/gazebo_worlds/worlds/empty.world __name:=gazebo __log:=/home/nico/.ros/log/eb4b8668-2d55-11e2-8cc9-001f3c927c3f/gazebo-1.log]. log file: /home/nico/.ros/log/eb4b8668-2d55-11e2-8cc9-001f3c927c3f/gazebo-1.log all processes on machine have died, roslaunch will exit shutting down processing monitor... ... shutting down processing monitor complete done anybody can help me, thank you. nico

2012-11-10 15:52:19 -0500 asked a question simulation the summit rover in ros?

hi everyone, i want to simulate the summitxl robot in ros, but i have some problems: nico@nico:~/fuerte_workspace/sandbox/summit_xl_sim$ rosmake [ rosmake ] rosmake starting...
[ rosmake ] No package specified. Building stack ['summit_xl_sim']
[ rosmake ] Packages requested are: ['summit_xl_sim']
[ rosmake ] Logging to directory /home/nico/.ros/rosmake/rosmake_output-20121111-114541 [ rosmake ] Expanded args ['summit_xl_sim'] to: ['summit_xl_odometry', 'robotnik_worlds', 'summit_xl_description', 'summit_xl_sbpl_nav', 'summit_xl_joystick', 'summit_xl_tf', 'summit_xl_ctrl', 'explore_stage', 'explore', 'summit_xl_2dnav'] [rosmake-0] Starting >>> roslang [ make ]
[rosmake-0] Finished <<< roslang No Makefile in package roslang
[rosmake-0] Starting >>> roscpp [ make ]
[rosmake-0] Finished <<< roscpp No Makefile in package roscpp
[rosmake-0] Starting >>> geometry_msgs [ make ]
[rosmake-1] Starting >>> colladadom [ make ]
[rosmake-0] Finished <<< geometry_msgs No Makefile in package geometry_msgs
[rosmake-0] Starting >>> sensor_msgs [ make ]
[rosmake-0] Finished <<< sensor_msgs No Makefile in package sensor_msgs
[rosmake-0] Starting >>> summit_xl_joystick [ make ]
[rosmake-1] Finished <<< colladadom ROS_NOBUILD in package colladadom
[rosmake-1] Starting >>> pr2_hardware_interface [ make ]
[rosmake-1] Finished <<< pr2_hardware_interface ROS_NOBUILD in package pr2_hardware_interface [rosmake-1] Starting >>> urdf_interface [ make ]
[rosmake-1] Finished <<< urdf_interface ROS_NOBUILD in package urdf_interface
[rosmake-1] Starting >>> urdf_parser [ make ]
[rosmake-1] Finished <<< urdf_parser ROS_NOBUILD in package urdf_parser
[rosmake-1] Starting >>> collada_parser [ make ]
[rosmake-1] Finished <<< collada_parser ROS_NOBUILD in package collada_parser
[rosmake-1] Starting >>> urdf [ make ]
[rosmake-1] Finished <<< urdf ROS_NOBUILD in package urdf
[rosmake-1] Starting >>> orocos_kdl [ make ]
[rosmake-1] Finished <<< orocos_kdl ROS_NOBUILD in package orocos_kdl
[rosmake-1] Starting >>> python_orocos_kdl [ make ]
[rosmake-1] Finished <<< python_orocos_kdl ROS_NOBUILD in package python_orocos_kdl [rosmake-1] Starting >>> kdl [ make ]
[rosmake-1] Finished <<< kdl ROS_NOBUILD in package kdl No Makefile in package kdl [rosmake-1] Starting >>> kdl_parser [ make ]
[rosmake-1] Finished <<< kdl_parser ROS_NOBUILD in package kdl_parser
[rosmake-1] Starting >>> rosbuild [ make ]
[rosmake-1] Finished <<< rosbuild No Makefile in package rosbuild
[rosmake-1] Starting >>> roslib [ make ]
[rosmake-1] Finished <<< roslib No Makefile in package roslib
[rosmake-1] Starting >>> rosconsole [ make ]
[rosmake-1] Finished <<< rosconsole No Makefile in package rosconsole
[rosmake-1] Starting >>> pluginlib [ make ]
[rosmake-1] Finished <<< pluginlib ROS_NOBUILD in package pluginlib
[rosmake-1] Starting >>> angles [ make ]
[rosmake-1] Finished <<< angles ROS_NOBUILD in package angles
[rosmake-1] Starting >>> pr2_mechanism_model [ make ]
[rosmake-1] Finished <<< pr2_mechanism_model ROS_NOBUILD in package pr2_mechanism_model [rosmake-1] Starting >>> pr2_controller_interface [ make ]
[rosmake-1] Finished <<< pr2_controller_interface ROS_NOBUILD in package pr2_controller_interface [rosmake-1] Starting >>> bullet [ make ]
[rosmake-1] Finished <<< bullet ROS_NOBUILD in package bullet
[rosmake-1] Starting >>> rospy [ make ]
[rosmake-1] Finished <<< rospy No Makefile in package rospy
[rosmake-1] Starting >>> rostest [ make ]
[rosmake-1] Finished <<< rostest No Makefile in package rostest
[rosmake-1] Starting >>> roswtf [ make ]
[rosmake-1] Finished <<< roswtf No Makefile in package roswtf
[rosmake-1] Starting >>> message_filters [ make ]
[rosmake-1] Finished <<< message_filters No Makefile in package message_filters [rosmake-1] Starting >>> tf [ make ]
[rosmake-1] Finished <<< tf ROS_NOBUILD in package tf
[rosmake-1] Starting >>> nav_msgs [ make ]
[rosmake-1] Finished <<< nav_msgs No Makefile in package nav_msgs
[rosmake-1] Starting >>> summit_xl_ctrl [ make ]
[rosmake-0] Finished <<< summit_xl_joystick [PASS] [ 0.60 seconds ]
[rosmake-0] Starting >>> std_srvs [ make ]
[rosmake-0] Finished <<< std_srvs No Makefile in package std_srvs
[rosmake-0] Starting >>> std_msgs [ make ]
[rosmake-0] Finished <<< std_msgs No Makefile in package std_msgs
[rosmake-0] Starting >>> summit_xl_description [ make ]
[rosmake-0] Finished <<< summit_xl_description [PASS] [ 0.09 seconds ]
[rosmake-0] Starting >>> sbpl [ make ]
[rosmake-1] Finished <<< summit_xl_ctrl [PASS] [ 0.67 seconds ]
[rosmake-1] Starting >>> summit_xl_odometry [ make ]
[ rosmake ] All 2 linessbpl: 0.1 sec ] [ summit_x... [ 2 Active 33/72 Complete ] {------------------------------------------------------------------------------- mkdir: 无法创建目录"build": 权限不够 -------------------------------------------------------------------------------} [ rosmake ] Output from build of package sbpl written to: [ rosmake ] /home/nico/.ros/rosmake/rosmake_output-20121111-114541/sbpl/build_output.log [rosmake-0] Finished <<< sbpl [FAIL] [ 0.13 seconds ]
[ rosmake ] Halting due to failure in package ... (more)

2012-11-06 20:26:28 -0500 asked a question how to obtain the velocity of summitxl?

i want to know the information of encoder or the velocity of the robot named summitxl. now i just get the information of odom, i don't know how to find the velocity. thank you.