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2023-05-25 04:28:02 -0500 | answered a question | ROS2 galactic demo node can't start I had a similar error, which I could solve by running sudo ldconfig. Afterwards the library was found. |
2023-05-25 03:53:55 -0500 | answered a question | ROS2 galactic demo node can't start I had a similar error today, which I could solve by apt-installing the package ros-dev-tools. Some of the stuff that i |
2023-03-03 04:18:59 -0500 | marked best answer | Dynamically resolve message type and subscribe to topic at runtime in roscpp ? Is it possible to subscribe to a topic configured at runtime in a C++ node? For example, is there an API to do the following in roscpp (adapted the code snippet seen here)? |
2023-02-09 05:08:53 -0500 | commented answer | Autocompletion for ros2 topic pub and ros2 service call does not work Seems to work even without adding "source ..." to the basrc. It seems to be sourced after installation automatically wit |
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2023-01-26 02:13:24 -0500 | commented answer | Undefined reference error while building To the shell where I run the build command. |
2022-10-12 04:42:12 -0500 | marked best answer | Semantics of `%time` timestamp in `rostopic echo -p` from bagfile? When I print the topic data using
I didn't find documentation about the first timestamp In this case, this would indicate that the message was recorded almost two seconds after the timestamp in the header indicates. Would it be reasonable to make inferences about the latency on the topic like this? |
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2022-08-15 02:14:10 -0500 | marked best answer | Loop Closure with Velodyne and Camera using RTAB-Map? I am running RTAB-Map with a 3d point cloud (Velodyne VLP-16). I use the icp_odometry node which seems to work quite well in principle, but it doesn't do loop closures. I found that this is, because loop closure requires visual features (https://github.com/introlab/rtabmap/i...). On that system I also have a stereo camera setup. But stereo processing takes really long (only 1-2 Hz framerate) and the matching results don't look very promising (disparity and points are very sparse).
As soon as I enable to subscribe the stereo images the full stereo processing takes up a huge amounts of resources and also make the occupancy grid to not use the point cloud from the LIDAR anymore (TODO: check I thought maybe it would be possible to add loop closure based on SIFT or SURF feature descriptors, that wouldn't maybe need to calculate the stereo point clouds (or maybe even work with only mono camera images). I've seen the parameter What is the most efficient way to do the mapping based on ICP, but with loop closures? Is there a way to accomplish this with a mono-camera? Is there a way to check whether I've successfully built my rtabmap stack to include the opencv contrib modules required for the visual features? |
2022-08-15 02:14:05 -0500 | answered a question | Loop Closure with Velodyne and Camera using RTAB-Map? There is an example configuation in the git repository: demo_husky.launch The config example number 11 does exactly tha |
2022-08-11 02:45:21 -0500 | answered a question | Undefined reference error while building I just had the same error. It seemed I forgot to source my ros installation (where the octomap was installed) before the |
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2022-06-23 07:02:51 -0500 | asked a question | Loop Closure with Velodyne and Camera using RTAB-Map? Loop Closure with Velodyne and Camera using RTAB-Map? I am running RTAB-Map with a 3d point cloud (Velodyne VLP-16). I u |
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2022-02-28 02:15:26 -0500 | answered a question | I can't start stereo camera calibration. Service not found Your camera driver doesn't advertise the service to change the camera info (or you are providing data from a bagfile). I |
2022-02-01 05:25:54 -0500 | commented answer | ImportError: No module named rospkg What you should rather do, is to install python3-rospkg. (I am using noetic on 20.04, and that is what I did.) |
2022-02-01 05:25:25 -0500 | commented answer | ImportError: No module named rospkg What you should rather do, is to install python3-rospkg instead. (I am using noetic on 20.04, and that is what I did.) |
2021-12-18 11:41:32 -0500 | marked best answer | Accessing values while iterating points in sensor_msgs::PointCloud2 from sensor_msgs::PointCloud2ConstIterator I am writing a node that subscribes to a topic of type In the callback I want to iterate the points in the point cloud using This is how I think it should be implemented (which seems to work, no serious testing so far, though): Is this about the recommended way of iterating the points in a point cloud? I've seen there was also an overload of the element access I got an output like this: I wondered, shouldn't the last two values be identical? |
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2021-09-29 08:06:21 -0500 | answered a question | Get all key/value pairs from custom ROS2 message There is no API for this, but as this is Python you can probably get away with a hack like this (untested code): from d |
2021-09-16 08:11:41 -0500 | commented question | Time Sequencer: on multiple input message types Obviously I can't point you towards something that provides exactly that functionality out of the box. Maybe you can fin |
2021-09-16 08:11:27 -0500 | commented question | Time Sequencer: on multiple input message types Obviously I can't point you towards something that provides exactly that functionality. Maybe you can find some inspirat |
2021-09-16 06:26:24 -0500 | commented question | Time Sequencer: on multiple input message types Any reason you don't subscribe to the topics individually, cache the results and trigger the update callback with a time |
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2021-07-16 01:49:14 -0500 | commented question | AMCL:As the robot rotates, the particles diverge And the navigation tuning guide |
2021-07-15 07:16:21 -0500 | edited answer | How to publish a dictionary with other dictionary inside in a topic? I'm trying to publish in a topic a dictionary with other dictionary inside As there are no direct dictionaries avai |
2021-07-15 07:14:45 -0500 | answered a question | How to publish a dictionary with other dictionary inside in a topic? I'm trying to publish in a topic a dictionary with other dictionary inside As there are no direct dictionaries avai |
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2020-11-12 10:09:11 -0500 | marked best answer | teleop_twist_joy doesn't publish On Ubuntu I have installed the package ros-indigo-teleop-twist-joy in order to convert my joystick input (/joy) to velocity commands (/cmd_vel). In order to test my setup I ran the provided launch file: which appears to run successful. I can echo the output of /joy, which works as expected: I can echo the output on /cmd_vel which produces the following ouput everytime I issue the command (and nothing but silence thereafter). Looking at the package's default configuration, I would expect to see an effect when I turn the left stick of my gamepad (Logitech F710). Triggering any of the sticks and axes apparantly doesn't change anything. roswtf and rqt_console are empty. Using rqt_graph I can see that everything is set up correctly (the joy_node is connected to the teleop_twist_node via /joy and the teleop_twist_node is connected to the running echo process via /cmd_vel). What am I doing wrong? |
2020-11-06 04:49:24 -0500 | commented question | friction coefficients not translating from URDF to SDF with <gazebo> tags it seems I have the same problem. Did you find the cause or did you reformulate the whole thing in plain xacro? |
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2020-08-04 07:46:13 -0500 | edited answer | Custom 4 wheel robot going backward That motion you observe is probably just some random motion that occurs when your actuators are actually not actuated at |
2020-08-04 07:43:16 -0500 | answered a question | Custom 4 wheel robot going backward That motion you observe is probably just some random motion that occurs when your actuators are actually not actuated at |
2020-07-29 02:26:06 -0500 | edited question | pr2_mechanism_controllers/LaserScannerTrajController doesn't work? pr2_mechanism_controllers/LaserScannerTrajController doesn't work? I'm trying to get my laser scanner to do a continuous |
2020-07-29 02:25:44 -0500 | edited question | pr2_mechanism_controllers/LaserScannerTrajController doesn't work? pr2_mechanism_controllers/LaserScannerTrajController doesn't work? I'm trying to get my laser scanner to do a continuous |
2020-07-29 02:24:37 -0500 | asked a question | pr2_mechanism_controllers/LaserScannerTrajController doesn't work? pr2_mechanism_controllers/LaserScannerTrajController doesn't work? I'm trying to get my laser scanner to do a continuous |
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2020-05-28 04:11:39 -0500 | answered a question | Is there a laser assembler that produces PointCloud2? A node was added to provide this functionality (although the documentation is lacking info about it). You can run it li |
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