David Lu's profile - overview

● Great Answer   × 12

• Why is A* used as global planner in move_base ?
• Navigation problem with COB3, DWAPlanerROS create Fail
• obstacle_range & raytrace_range - precise explanation?
• Two joints for one link
• How do I find people around me who use ROS?
• Using XACRO for Generating URDF Files
• Is there a list of free available robot models for gazebo?
• Why are search engines (Google, Bing) returning ROS wiki mirror search results instead of results for the main site?
• Catkin-compiled Code Runs 3x slower
• Tweak or customize cost around people on the costmap
• Why navfn is using Dijkstra?
• How to use dwa_local_planner in move_base?

● Enthusiast   × 1

● Civic Duty   × 1

• calling xacro:macro from within xacro:macro

● Organizer   × 1

• Diamondback SVN build; roscore won't start, ImportError: No module named rosgraph_msgs.msg

● Autobiographer   × 1

● Nice Question   × 26

• eprosima::fastcdr::exception::NotEnoughMemoryException with rclpy.ActionClient
• RViz2 with Unusable Frame Rate
• Atom + linter-clang
• Position and Velocity
• package:// Usage
• URDF in Python
• Email Notifications on Interesting Questions
• Plans for pluginlib for Python
• FollowJointTrajectory Usage
• LaserScans not in the Map
• Custom CostMap Values
• Latched Message in Rosbag Python
• Hydro Turtle
• Mimic Tag in PR2 Simulation
• OccupancyGrid vs. Costmap
• Remote Roslaunch Failure
• ROS and Gazebo: Documentation Soon?
• How do I only run tests for only one package?
• Catkin-compiled Code Runs 3x slower
• How to fix an Unstable Build
• Difference Between build_depends and find_package components
• Can't Link to liborocos-kdl.so.1.1
• rostest - Minimum Working Example
• Cost for Maintaining the Build Farm
• Could not find a configuration file for package *
• Cannot load Mesh Marker in ros3djs

● Good Question   × 16

• Difference Between build_depends and find_package components
• eprosima::fastcdr::exception::NotEnoughMemoryException with rclpy.ActionClient
• URDF in Python
• Email Notifications on Interesting Questions
• Plans for pluginlib for Python
• FollowJointTrajectory Usage
• Custom CostMap Values
• Hydro Turtle
• OccupancyGrid vs. Costmap
• ROS and Gazebo: Documentation Soon?
• How do I only run tests for only one package?
• Catkin-compiled Code Runs 3x slower
• Position and Velocity
• Latched Message in Rosbag Python
• Could not find a configuration file for package *
• rostest - Minimum Working Example

● Good Answer   × 50

• Navigation: Resolution of Global Costmap
• static_layer gets deleted by obstacle_layer in global_costmap
• Problem with costmap2dros and tf transform listener in ros melodic
• Why doesn't costmap clear the old obstacles outside the scanner scope?
• How to use the DWB local planner
• What is the difference between min_vel_x, min_trans_vel and trans_stopped_vel?
• What kind of control system does move_base have?
• Navigation problem with COB3, DWAPlanerROS create Fail
• Move_base/dwa parameters for a large robot with rotation center in the front
• Why is A* used as global planner in move_base ?
• Costmap_2d update_frequency parameter
• DWB local planner footprint configuration
• Different urdf models in rviz
• gazebo urdf tutorial robots not visible
• How to get a collision-free path in a known map with move_base?
• Using XACRO for Generating URDF Files
• How do I find people around me who use ROS?
• Why import my own robot model goes to mess?
• [how to] Crank mechanism under URDF notation.
• rviz urdf beginner questions
• Sending a message to turtlesim
• stl error loading
• Is there a list of free available robot models for gazebo?
• Two joints for one link
• How do I visualize the URDF models of the NXT robots?
• Why are search engines (Google, Bing) returning ROS wiki mirror search results instead of results for the main site?
• why does joint state publisher publish joints in a messed order?
• STUCK at Turning!!!!!! Navigation help!
• Catkin-compiled Code Runs 3x slower
• What is the difference between *.XACRO and *.URDF.XACRO files?
• Dwb local planner or standard navigation stack ?
• Why navfn is using Dijkstra?
• urdf_tutorial Groovy vs. Fuerte
• Tweak or customize cost around people on the costmap
• how to edit costmap data manually?
• navigation for non-holonomic robots
• Clearing operation in costmap_2d explanation ?
• use navigation stack with different method for localization
• ROS navigation real-world implementation ?
• How can I track distance traveled and Velocity of the robot?
• obstacle_range & raytrace_range - precise explanation?
• File conversion from *.urdf to *.xacro.
• How to use dwa_local_planner in move_base?
• Problem when using navigation stack in the rviz
• calling xacro:macro from within xacro:macro
• Converting SolidWorks stuff to URDF. STL and Meshlab problems
• URDF origins tags
• URDF model
• Error in URDF file
• how to remove forward bias in move_base

● Notable Question   × 91

• eprosima::fastcdr::exception::NotEnoughMemoryException with rclpy.ActionClient
• RViz2 with Unusable Frame Rate
• Finding OpenCV Paths in ROS Builds
• PR2's `robot claim` Source Code?
• Check if ROS2 Parameters Exist with RCLCPP
• ROS2 Linking
• ROS2 Python Migration Guide
• `builtin_interfaces` package location
• How to get an array of parameters with rclcpp
• Releasing Packages for Different OS Flavors
• Bloom with Pip Test Depend
• PR2 Calibration Graphs and Improvement
• Moderating ROS-Users
• LaserScans not in the Map
• FollowJointTrajectory Usage
• Rospack Caching Failure
• Correct settings for RosAnswers email?
• PointCloud Input to costmap_2d
• package:// Usage
• How to make rostopic listen to custom messages
• Mimic Tag in PR2 Simulation
• trajectory_filter and pluginlib syntax 1.2
• Remote Roslaunch Failure
• Starting Calibration with openni_tracker
• Position and Velocity
• Email Notifications on Interesting Questions
• Sound_play action library
• ROS Wiki Indexer
• OccupancyGrid vs. Costmap
• Semantic_point_annotator Parameter Explanation
• Cross-package PluginLib Library Loading Error
• Plans for pluginlib for Python
• Move_base Costmaps vs. NavFn Costmap
• Inserting into a Rosbag
• Did I Break the Build?
• Hydro Turtle
• Editing Answers on answers.ros.org
• Custom CostMap Values
• c1 vs c2 PR2 Filesystem Organization
• Installing WebUI with proper Environmental Variables
• Arbitrary Marker in Rviz
• URDF in Python
• Roscpp Publisher not publishing all messages
• Debugging Prerelease Issue
• Elevators and Multifloor Navigation
• Latched Message in Rosbag Python
• TypeError for built-in operation
• Multiple Cores running in rostest
• ROS and Gazebo: Documentation Soon?
• How do I only run tests for only one package?
• Catkin-compiled Code Runs 3x slower
• Where did unstable.rosdistro go?
• Difference Between build_depends and find_package components
• How to fix an Unstable Build
• Illogical TF Chain
• Could not find a configuration file for package *
• What uses the Grasp Message?
• bloom - same version number, different tag
• ROS2 Messages and Service Generation Problem
• PR2 in V-REP
• Pluginception: Build Factory
• Can't Link to liborocos-kdl.so.1.1
• Catkin Workspace Appending Workspace to End of ROS_PACKAGE_PATH
• Arguments in Setup.py
• Face Detection Parameters in Electric
• Cannot load Mesh Marker in ros3djs
• rostest - Minimum Working Example
• Missing Documentation on _rules
• Frame Conventions for Interactive Markers
• CMakeLists.txt: Install Python
• How to Unbuild Packages
• Programmatically Polling the Build Farm
• rostest - Executable not rebuilding
• Cost for Maintaining the Build Farm
• Build Farm says it can't Catkin
• Build Farm says it can't Catkin
• Simple Interactive_marker_proxy example
• Build Farm Output is Difficult to Read
• ethzasl_icp_mapper service Minimal Example
• ImportError: libmoveit_kinematics_plugin_loader.so
• transformPointCloud without PCL
• Removing a prefix from a Diagnostics Aggregator Group
• rqt_robot_dashboard Icon Size
• Failed to Fetch While Releasing
• Releasing RobotWebTools on CDN
• "ERROR: Stack's declared dependencies are missing calculated dependencies"
• Buildfarm Fails because of Downstream Package
• PkgConfig in Groovy on Quantal
• import tf2/StaticTransformPublisher in Python
• Displaying Big Maps in RViz
• Atom + linter-clang

● Stellar Question   × 1

• Catkin-compiled Code Runs 3x slower

● Favorite Question   × 4

• rostest - Minimum Working Example
• Custom CostMap Values
• FollowJointTrajectory Usage
• Catkin-compiled Code Runs 3x slower

● Famous Question   × 83

• RViz2 with Unusable Frame Rate
• Releasing Packages for Different OS Flavors
• PR2's `robot claim` Source Code?
• bloom - same version number, different tag
• ROS2 Messages and Service Generation Problem
• Check if ROS2 Parameters Exist with RCLCPP
• Bloom with Pip Test Depend
• ROS2 Python Migration Guide
• ROS2 Linking
• `builtin_interfaces` package location
• How to get an array of parameters with rclcpp
• Atom + linter-clang
• PR2 Calibration Graphs and Improvement
• Moderating ROS-Users
• LaserScans not in the Map
• FollowJointTrajectory Usage
• Rospack Caching Failure
• Correct settings for RosAnswers email?
• PointCloud Input to costmap_2d
• package:// Usage
• How to make rostopic listen to custom messages
• Mimic Tag in PR2 Simulation
• trajectory_filter and pluginlib syntax 1.2
• Starting Calibration with openni_tracker
• Position and Velocity
• Email Notifications on Interesting Questions
• Sound_play action library
• ROS Wiki Indexer
• OccupancyGrid vs. Costmap
• Plans for pluginlib for Python
• Move_base Costmaps vs. NavFn Costmap
• Did I Break the Build?
• Custom CostMap Values
• Installing WebUI with proper Environmental Variables
• Arbitrary Marker in Rviz
• URDF in Python
• Roscpp Publisher not publishing all messages
• Remote Roslaunch Failure
• Debugging Prerelease Issue
• Elevators and Multifloor Navigation
• Hydro Turtle
• Cross-package PluginLib Library Loading Error
• c1 vs c2 PR2 Filesystem Organization
• TypeError for built-in operation
• Inserting into a Rosbag
• ROS and Gazebo: Documentation Soon?
• Latched Message in Rosbag Python
• Multiple Cores running in rostest
• Catkin-compiled Code Runs 3x slower
• How do I only run tests for only one package?
• What uses the Grasp Message?
• Could not find a configuration file for package *
• Pluginception: Build Factory
• Illogical TF Chain
• Can't Link to liborocos-kdl.so.1.1
• Catkin Workspace Appending Workspace to End of ROS_PACKAGE_PATH
• Face Detection Parameters in Electric
• PR2 in V-REP
• Cannot load Mesh Marker in ros3djs
• Difference Between build_depends and find_package components
• CMakeLists.txt: Install Python
• rostest - Minimum Working Example
• Cost for Maintaining the Build Farm
• Where did unstable.rosdistro go?
• Editing Answers on answers.ros.org
• Frame Conventions for Interactive Markers
• Build Farm says it can't Catkin
• Arguments in Setup.py
• ethzasl_icp_mapper service Minimal Example
• How to fix an Unstable Build
• How to Unbuild Packages
• Buildfarm Fails because of Downstream Package
• rqt_robot_dashboard Icon Size
• Failed to Fetch While Releasing
• ImportError: libmoveit_kinematics_plugin_loader.so
• transformPointCloud without PCL
• rostest - Executable not rebuilding
• Removing a prefix from a Diagnostics Aggregator Group
• PkgConfig in Groovy on Quantal
• Simple Interactive_marker_proxy example
• import tf2/StaticTransformPublisher in Python
• Semantic_point_annotator Parameter Explanation
• Displaying Big Maps in RViz

● Popular Question   × 90

• eprosima::fastcdr::exception::NotEnoughMemoryException with rclpy.ActionClient
• RViz2 with Unusable Frame Rate
• Finding OpenCV Paths in ROS Builds
• ROS2 Messages and Service Generation Problem
• ROS2 Linking
• Check if ROS2 Parameters Exist with RCLCPP
• ROS2 Python Migration Guide
• `builtin_interfaces` package location
• How to get an array of parameters with rclcpp
• Releasing Packages for Different OS Flavors
• Bloom with Pip Test Depend
• How to make rostopic listen to custom messages
• Custom CostMap Values
• FollowJointTrajectory Usage
• Starting Calibration with openni_tracker
• PointCloud Input to costmap_2d
• PR2 Calibration Graphs and Improvement
• Moderating ROS-Users
• LaserScans not in the Map
• c1 vs c2 PR2 Filesystem Organization
• Rospack Caching Failure
• Correct settings for RosAnswers email?
• package:// Usage
• Mimic Tag in PR2 Simulation
• trajectory_filter and pluginlib syntax 1.2
• Remote Roslaunch Failure
• Position and Velocity
• Email Notifications on Interesting Questions
• Sound_play action library
• ROS Wiki Indexer
• Where did unstable.rosdistro go?
• OccupancyGrid vs. Costmap
• Semantic_point_annotator Parameter Explanation
• Cross-package PluginLib Library Loading Error
• Plans for pluginlib for Python
• Move_base Costmaps vs. NavFn Costmap
• Inserting into a Rosbag
• Did I Break the Build?
• Hydro Turtle
• Editing Answers on answers.ros.org
• Installing WebUI with proper Environmental Variables
• Arbitrary Marker in Rviz
• URDF in Python
• Debugging Prerelease Issue
• Roscpp Publisher not publishing all messages
• Elevators and Multifloor Navigation
• Latched Message in Rosbag Python
• TypeError for built-in operation
• Multiple Cores running in rostest
• How do I only run tests for only one package?
• ROS and Gazebo: Documentation Soon?
• Missing Documentation on _rules
• Arguments in Setup.py
• Catkin-compiled Code Runs 3x slower
• Illogical TF Chain
• How to fix an Unstable Build
• Difference Between build_depends and find_package components
• Catkin Workspace Appending Workspace to End of ROS_PACKAGE_PATH
• PR2 in V-REP
• Could not find a configuration file for package *
• What uses the Grasp Message?
• bloom - same version number, different tag
• Pluginception: Build Factory
• Build Farm Output is Difficult to Read
• Buildfarm Fails because of Downstream Package
• How to Unbuild Packages
• Can't Link to liborocos-kdl.so.1.1
• Build Farm says it can't Catkin
• Face Detection Parameters in Electric
• Cannot load Mesh Marker in ros3djs
• rostest - Minimum Working Example
• Frame Conventions for Interactive Markers
• CMakeLists.txt: Install Python
• Programmatically Polling the Build Farm
• rostest - Executable not rebuilding
• Cost for Maintaining the Build Farm
• Simple Interactive_marker_proxy example
• PkgConfig in Groovy on Quantal
• Releasing RobotWebTools on CDN
• ethzasl_icp_mapper service Minimal Example
• ImportError: libmoveit_kinematics_plugin_loader.so
• transformPointCloud without PCL
• Removing a prefix from a Diagnostics Aggregator Group
• rqt_robot_dashboard Icon Size
• Failed to Fetch While Releasing
• "ERROR: Stack's declared dependencies are missing calculated dependencies"
• Displaying Big Maps in RViz
• import tf2/StaticTransformPublisher in Python
• Atom + linter-clang
• PR2's `robot claim` Source Code?

● Guru   × 11

• Why is A* used as global planner in move_base ?
• Navigation problem with COB3, DWAPlanerROS create Fail
• obstacle_range & raytrace_range - precise explanation?
• Two joints for one link
• How do I find people around me who use ROS?
• Using XACRO for Generating URDF Files
• Is there a list of free available robot models for gazebo?
• Why are search engines (Google, Bing) returning ROS wiki mirror search results instead of results for the main site?
• Catkin-compiled Code Runs 3x slower
• Tweak or customize cost around people on the costmap
• How to use dwa_local_planner in move_base?

● Nice Answer   × 113

• Navigation: Resolution of Global Costmap
• what difference between voxel layer and obstacle layer ?
• static_layer gets deleted by obstacle_layer in global_costmap
• Simple 2D Navigation Goal is making robot to drive circles endlessly
• Loading variables with xacro:include
• How to configure local_costmap.yaml to use CostmapAdapter in DWB planner
• Why doesn't costmap clear the old obstacles outside the scanner scope?
• sending a sequence of goals to move_base
• dwa local planner: deceleration limit?
• What is the difference between min_vel_x, min_trans_vel and trans_stopped_vel?
• How to Load a URDF File to RVIZ
• Dwa failed to produce path in free space
• move_base navigating robot to close to costmap?
• Navigation problem with COB3, DWAPlanerROS create Fail
• Implementation details about costmap_2d package
• how to setup range_sensor_layer in local costmap
• Why is A* used as global planner in move_base ?
• URDF Links and Joints Orientation
• Problem with costmap2dros and tf transform listener in ros melodic
• Possible to write move_base plugin in Python?
• Costmap_2d update_frequency parameter
• DWB local planner footprint configuration
• How to use the DWB local planner
• Different urdf models in rviz
• costmap_2d python interface?
• When optimizing the DWA local planner, is there a way to get the the total cost assocaited from APIs or from the parameter server?
• How to get a collision-free path in a known map with move_base?
• Use global planner to "DETECT" obstacles (not simply avoid or re-plan path)
• Accessing data of different layers in Costmap2DROS
• Configuring the layered costmap[SOLVED]
• Machine Learning Algorithm
• Possible to have local costmap aligned with base link?
• Using XACRO for Generating URDF Files
• How do I find people around me who use ROS?
• Importing XML to gazebo
• Using arm_kinematics, Inverse Kinematics Calculations fail
• simmechanics_to_urdf problem
• Why robot_model use urdf not just using universal CAD extension file?
• Why import my own robot model goes to mess?
• Multiple visual entries in urdf
• [how to] Crank mechanism under URDF notation.
• rviz urdf beginner questions
• update face_detector for electric?
• Sending a message to turtlesim
• problem with .bag file
• stl error loading
• Two joints for one link
• How do I visualize the URDF models of the NXT robots?
• Is there a list of free available robot models for gazebo?
• datatype/md5sum error with p2os_teleop
• Exact relative position between two links
• Why are search engines (Google, Bing) returning ROS wiki mirror search results instead of results for the main site?
• What do the 'quiet' and 'all topics' checkboxes in rxgraph do?
• Converting SolidWorks stuff to URDF. STL and Meshlab problems
• arm_navigation package (lack of) scaling issue from urdf files
• types of joints to design a robot model
• How can I track distance traveled and Velocity of the robot?
• why does joint state publisher publish joints in a messed order?
• URDF model
• "pr2_tuck_arms_action" for pr2
• R2D2 urdf moving in Rviz but not Gazebo
• What is the origin of the inertia tensor in URDF
• gazebo urdf tutorial robots not visible
• URDF robot root joint
• urdf tutorial in groovy
• how to edit costmap data manually?
• Navfn - Potential Field Calculation
• STUCK at Turning!!!!!! Navigation help!
• urdf_tutorial Groovy vs. Fuerte
• transform broadcaster for multiple senors
• How can I combine two xacros with a common root?
• What is the difference between *.XACRO and *.URDF.XACRO files?
• Catkin-compiled Code Runs 3x slower
• Why navfn is using Dijkstra?
• Testing DWA Local Planner - approaches goal, stops, keeps swinging left & right
• Global_planner package with A* planner question.
• What kind of control system does move_base have?
• Dwb local planner or standard navigation stack ?
• Error in URDF file
• File conversion from *.urdf to *.xacro.
• Problem loading urdf in rviz (groovy)
• Tweak or customize cost around people on the costmap
• Time needed for complete urdf model?
• Adding obstacles (lines) to costmap
• obstacle_range & raytrace_range - precise explanation?
• navigation for non-holonomic robots
• ROS navigation real-world implementation ?
• ROS Navigation Stack, Global Planner, Waypoints
• Replace move_base planners with a real-time algorithm
• ROS Navigation Stack, Hydro and Indigo
• Clearing operation in costmap_2d explanation ?
• local map subtraction for moving object detection
• calling xacro:macro from within xacro:macro
• use navigation stack with different method for localization
• Rezise of the map necessary?
• Move_base/dwa parameters for a large robot with rotation center in the front
• move_base accuracy thresholds
• Any ROS node for people (legs) tracking?
• unable to clear obstaces in the costmap
• I have a question about URDF models and tf transformations
• I would like to know if an ultrasonic sensor array (3-Sensors, 45 degrees apart) will be able to mimic the laser range sensor required for the navigation stack provided by ROS.
• How to use dwa_local_planner in move_base?
• No transform from /odom using robot_state_publisher
• Problem when using navigation stack in the rviz
• Why is the default update rate for costmap2d only 5Hz, not the sensor rate?
• Bug: Mesh file path in URDF. Cannot locate resource file://
• URDF origins tags
• how to remove forward bias in move_base
• How to navigate to unknown space in costmap?
• Navigation: Polygon lies outside map bounds, so we can't fill it
• Two joints for one link
• Rotates rolling_window with the robot
• How performe rosrun on joint_state_publisher

● Editor   × 1

• How do I find people around me who use ROS?

● Scholar   × 1

• Correct settings for RosAnswers email?

● Necromancer   × 12

• simmechanics_to_urdf problem
• Converting SolidWorks stuff to URDF. STL and Meshlab problems
• Custom CostMap Values
• tf.ExtrapolationException in simmechanics_tutorial package
• Unable to use the pr2 navigation stack tutorial on ros groovy
• Problem loading urdf in rviz (groovy)
• Why navfn is using Dijkstra?
• Extrapolation error using hector_mapping + move_base
• Adding obstacles (lines) to costmap
• Waypoint Navigation: Simplified Local Planner
• Cost Map 2D Setup
• Global Costmap only publishing once to a subscriber?

● Critic   × 1

• ROS Tutorial

● Commentator   × 1

• Converting SolidWorks stuff to URDF. STL and Meshlab problems

● Student   × 1

• Correct settings for RosAnswers email?

● Enlightened   × 1

• Using XACRO for Generating URDF Files

● Supporter   × 1

• What is a ROS package?

● Teacher   × 1

• Using XACRO for Generating URDF Files

● Self-Learner   × 6

• Face Detection Parameters in Electric
• Custom CostMap Values
• PointCloud Input to costmap_2d
• Roscpp Publisher not publishing all messages
• Catkin-compiled Code Runs 3x slower
• Multiple Cores running in rostest

● Taxonomist   × 1

● Rapid Responder   × 31

• Use macros with rosparam
• path planning not working
• what difference between voxel layer and obstacle layer ?
• dwa local planner: deceleration limit?
• What is the difference between min_vel_x, min_trans_vel and trans_stopped_vel?
• what depends on control frequency and planner_frequency in move_base?
• Is this a way to call xacro macro?
• Create a urdf/xacro file from model of FreeCAD
• amcl package not on ROS Noetic
• check_urdf fails stating no link elements found in urdf file
• DWB local planner final in-place rotation never happen RotateToGoal
• error in urdf file
• leg_detector only publish on visualization_marker and only legs, no people
• DWA planner not respecting "inflation space"
• Navigation Stack: Obstacles detected by RGB-D Camera get cleared out when disappear from FOV
• How to understand robot_radius in costmap parameters and inflation_radius in inflation_layer?
• I had a problem when switching from URDF to XACRO.
• How to utilize Costmap in navigation process?
• ROS Navigation: Remove objects from the costmap with delay
• Having problems reading .STL file in 10-myfirst.urdf
• A costmap - a general concept or a ROS concept?
• URDF packages
• Conversion of xacro to urdf
• Dynamic obstacles inflation layer configuration
• Why are obstacles added at the edges of the global costmap when GlobalPlanner is used?
• Why does NavFn return a path that doesn't start from the robot location?
• Why is A* used as global planner in move_base ?
• Problem with costmap2dros and tf transform listener in ros melodic
• Parallel Joints in ROS
• Costmap_2d update_frequency parameter
• Local_costmap not showing every obstacle

● Great Question   × 8

• Email Notifications on Interesting Questions
• OccupancyGrid vs. Costmap
• ROS and Gazebo: Documentation Soon?
• Catkin-compiled Code Runs 3x slower
• FollowJointTrajectory Usage
• How do I only run tests for only one package?
• Could not find a configuration file for package *
• rostest - Minimum Working Example