AsifA's profile - activity

Hi, I am using but_velodyne_proc package to obtain 2d laser scan sensor_msgs/LaserScan from a 3d Velodyne sensor_msgs/PointCloud2. It seems that it works fine because I can visualize laser scan and point cloud in rviz. However, problem arises when I try to use this 360 degree laser scan data with gmapping to obtain a 2d occupancy map using:

rosrun gmapping slam_gmapping scan:=/velodyne/scan

It gives me following error:

slam_gmapping: /tmp/buildd/ros-hydro-openslam-gmapping-0.1.0-2precise-20140617-1746/scanmatcher/scanmatcher.cpp:563: void GMapping::ScanMatcher::setLaserParameters(unsigned int, double*, const OrientedPoint&): Assertion `beams<2048' failed. Aborted (core dumped)

The error of "beam 2048" is coming from here. Gmapping is working fine when I am using LaserScan from the lidar installed on my robot. Do you think this is because I am feeding 360 degree scan? I can see that scan header of the lidar is coming with angle_min: -2.35619449615 angle_max: 2.35619449615, whereas header of LaserScan obtained from Velodyne is angle_min: -3.14159274101 angle_max: 3.14159274101. I am very beginner with all this stuff and do not understand the meaning of "LASER_MAXBEAMS 2048" defined in the header file. Your guideline to fix this problem is much appreciated!

By "system-installed python modules" you mean the python that comes by default with Ubuntu 14.04?

Yes. I have Anaconda and SALOME installed.

Its already installed on my system. To make sure, I removed and installed again but no luck. Do you think there are some path issues?

Hi. I am using husky_description and want to launch description.launch, which I was used to successfully launch in ROS Hydro at Ubuntu 12.04. Now I am using ROS Indigo on Ubuntu 14.04 and it shows me following error.

Traceback (most recent call last): File "/opt/ros/indigo/lib/joint_state_publisher/joint_state_publisher", line 5, in <module> import wx ImportError: No module named wx

[joint_state_publisher-3] process has died [pid 11298, exit code 1, cmd >/opt/ros/indigo/lib/joint_state_publisher/joint_state_publisher __name:=joint_state_publisher __log:=/home/asif/.ros/log/5bdd4b1c-130a-11e6-a55d-d4bed970caa5/joint_state_publisher-3.log]. log file: /home/asif/.ros/log/5bdd4b1c-130a-11e6-a55d-d4bed970caa5/joint_state_publisher-3*.log

I can not import wx in python shell as well (it shows the same ImportError). In another system (ROS Indigo, Ubuntu 14.04 and default installations of python2.7), it works fine. I have installed wxtools using sudo apt-get install python-wxtools. and the error is still there. Probably, the error is due to some additional python installations such as Anaconda 2.4.1 and SALOME. Any idea how to handle it? Thanks

Hi, I want to convert pointcloud data set to mesh. What I know is that first I need to convert pointcloud recorded in a rosbag to pcd, then pcd to ply, and finally ply to mesh using MeshLab.

I can create number of pcd files from pointcloud using

rosrun pcl_ros bag_to_pcd <input_file.bag> <topic> <output_directory>

but I have no idea how to convert pcd files to a ply file. Can anyone suggest me how to do pcd to ply or if there is a better way to convert pcl to mesh?

Thank you.

This may not be very relevant but if you are interested in sensor planning when you have a mobile remote sensor (gas sensor, camera, laser or any other for which you can define sensing range and field of view) and you want to cover the whole environment by taking measurements at minimum number of positions then here is a possible solution.

However, the code is not available on ROS. Hopefully I will be able to release it at some point in near future.

Hi,

I have recorded number of rosbags using --split option, say "file_0.bag", "file_1.bag", "file_2.bag" and so on to build a map. My question is: how to play them back one after the other. Using $ rosbag play file_0.bag file_1.bag file_2.bag plays all files at the same time. Whereas, I want to play one after another.

Thanks.

Is it possible in ROS to record current weather conditions from a website or weather-indicator in Ubuntu? I would like to record current atmosphere temperature, humidity, etc for some experiments. Thanks.

Great. In order to use local time instead of universal you can remove -u from date option.

Yes it does. Thanks

Hi,

I am launching a main.launch file. This file is calling several other configuration files of several nodes depending on the task. I know that I can record the data using rosbag record when I'm on mission.

Is there a possibility to save all the configurations along with rosbag? I am looking for some thing similar as profile in Matlab.

Any help is much appreciated. :)