Alvaro Salcedo's profile - activity

Hi Ros Users:

I have just created a map in gazebo 2.2. i have saved, but i want to edit now. How can i edit? because I cant see any options in gazebo "building editor" to edit my map that i created.

Any ideas?

thanks

Hi Users:

I would like to know the pros and cons between Stage and Gazebo. Is there any document where I can find out?

Thanks!!!

Hi Ros users:

I am doing a calibration camera and I have to have a calibration pattern in Gazebo. I like to know if there is a .stl calibration pattern chessboard file on the internet to do that. And if there is not, how can I do it?

Thanks a lot.

Hi Ros users! I have just done a .cpp wich publish velocities in a opic (p3dx/cmd_vel) Here it is:

int main(int argc, char **argv)
{
  ros::init(argc, argv, "lanzando_vel");
  ros::NodeHandle n;
  ros::Publisher vel_pub_ = n.advertise<geometry_msgs::Twist>("p3dx/cmd_vel", 1);

  while (ros::ok())
  {
  geometry_msgs::Twist cmd;
  cmd.linear.x = 0;
  cmd.linear.y = 0;
  cmd.linear.z = 0;

  cmd.angular.x = 0;
  cmd.angular.y = 0;
  cmd.angular.z = 0;
    vel_pub_.publish(cmd);
  }
    return 0;
}

I would like to publish an array velocities, for example:

at 1seg ==> cmd.linear.x=1 at 3 seg==> cmd.linear.x=4 . . .

how can I do that?

Thank you so much!

Hi Ros Users :

I am trying to put noise to my P3DX model wich is https://github.com/RafBerkvens/ua_ros... Because the model behaviour is unrealistic.

Does Anybody know what I must modify in the code to do that?

Thanks!!!!

In respose to your comment @Javi V.

I modify this part of the code:

 <!-- ground truth -->
<gazebo>
<plugin name="p3d_base_controller" filename="libgazebo_ros_p3d.so">
<alwaysOn>true</alwaysOn>
<updateRate>100.0</updateRate>
<bodyName>base_link</bodyName>
<topicName>${ns}/base_pose_ground_truth</topicName>
<gaussianNoise>0.01</gaussianNoise>
<frameName>map</frameName>
<!-- initialize odometry for fake localization -->
<xyzOffsets>0 0 0</xyzOffsets>
<rpyOffsets>0 0 0</rpyOffsets>
</plugin>
</gazebo>

in Gaussian noise but it does the same... any ideas? Do I have to change something else to make this work ?

hi Ros users:

I am trying to do an array of velocities. This is my code:

  geometry_msgs::Twist cmd;
  geometry_msgs::TwistStamped tiempo;
  cmd.linear.x = 1; 
  cmd.linear.y = 0;
  cmd.linear.z = 0;

  tiempo.header.stamp=5;
  cmd.angular.x = 0;
  cmd.angular.y = 0;
  cmd.angular.z = 4;
  vel_pub_.publish(cmd);

But when it is compiled i can see these errors on terminal

/home/alcor/catkin_ws/src/lanzar_velocidades/src/arrayvel.cpp:52:3: error: ‘geometry’ has not been declared geometry::TwistStamped tiempo; ^ /home/alcor/catkin_ws/src/lanzar_velocidades/src/arrayvel.cpp:52:26: error: expected ‘;’ before ‘tiempo’
geometry::TwistStamped tiempo; ^ /home/alcor/catkin_ws/src/lanzar_velocidades/src/arrayvel.cpp:57:3: error: ‘tiempo’ was not declared in this scope tiempo.header.stamp=5;
^ make[2]: * [lanzar_velocidades/CMakeFiles/arrayvel_node.dir/src/arrayvel.cpp.o] Error 1 make[1]: * [lanzar_velocidades/CMakeFiles/arrayvel_node.dir/all] Error 2

Any ideas?

Thanks!

Hi Ros users:

I have a script where I use OpenCV functions and ROS functions. But I have a problem when I run this script. Mi question is: What version of OpenCV have I to install to work with Ros Indigo?

Thanks a lot!!!!!

Hello ros users. I am trying to subscribe to base_pose_ground_truth topic but I can't. My code is this:

nav_msgs::base_pose_ground_truth subs;
 double variable1;
 double variable2;
 void velsubcallback(const nav_msgs::base_pose_ground_truth& msg)
   {

  variable1=msg.twist.twist.linear.x;
    variable2=msg.twist.twist.angular.z;
     lectura_ros.linear=variable1;
     lectura_ros.angular=variable2;
     ROS_INFO("variable %f",lectura_ros.linear);

How can i subscribe on that topic?

Thanks!

Hi Ros users:

I would like to download the pkg of this camera which Gazebo provides us:

So I would like that when I launch a .launch the camera is in the same place and I would like to be able to access topics (for example "camera/link/camera/image" as you can see below on the pic) in the terminal or in RVIZ. So it is possible to download this camera as pkg? Or to do that in any way?

Thanks!!!

Hi Ros users:

I am trying to add gaussian noise to velocities of P3DX. The model that I am using is from this source https://github.com/RafBerkvens/ua_ros... I have modified this part of code:

  <!-- ground truth -->
    <gazebo>
        <plugin name="p3d_base_controller" filename="libgazebo_ros_p3d.so">
            <alwaysOn>true</alwaysOn>
            <updateRate>100.0</updateRate>
            <bodyName>base_link</bodyName>
            <topicName>${ns}/base_pose_ground_truth</topicName>
             <gaussianNoise>0.01</gaussianNoise>
            <frameName>map</frameName>
            <!-- initialize odometry for fake localization -->
            <xyzOffsets>0 0 0</xyzOffsets>
            <rpyOffsets>0 0 0</rpyOffsets>
    <velocityGaussianNoise>10 10 10</velocityGaussianNoise>
        </plugin>
    </gazebo>

I change the part where it says "gaussiannoise nad velocityGaussianNoise" but it works in the same way.

Does anybody know how i can add gaussian noise to P3DX model??

Thank you so much.

@Sebastian Kasperski @Icehawk101 Hello my friends. I have just edited the post!!! Thanks again,

@Sebastian Kasperski It gives me this error as well: LaserRangeFinder::Validate() - LocalizedRangeScan contains 672 range readings, expected 673

@Sebastian Kasperski I have just eddited with more information!! thanks!!

I have just editted post! @Sebastian Kasperski

Every problems before fixed:

EDIT 6: Hi friends!! I have just fixed every problems with your help. So now my robot moves with StartMapping and with StartExplorer, but not really well...

I think that it do good StartMapping but when I do StartExplorer, my robot explores just a few second and it gets stuck in a wall. I think that this problem is for some .yaml parameters.

But I modify a lot of parameters to check if it does a good navigatiion and alwais it gets stuck. Which parameters have I to modify or what I can do???

Thanka lot!