vvyogi's profile - activity

In my gazebo model I have 9 differential drive vehicles.
When I execute rostopic list i get

/bot_0/cmd_vel
/bot_0/odom
/bot_1/cmd_vel
/bot_1/odom
/bot_2/cmd_vel
/bot_2/odom
/bot_3/cmd_vel
/bot_3/odom
/bot_4/cmd_vel
/bot_4/odom
/bot_5/cmd_vel
/bot_5/odom
/bot_6/cmd_vel
/bot_6/odom
/bot_7/cmd_vel
/bot_7/odom
/bot_8/cmd_vel
/bot_8/odom
/clock
/gazebo/link_states
...    and so on

I wish to find out all the odom topics in python script and subscribe to all of them using the message_filter

However, I am not being able to find/locate the getTopics() function as is mentioned here Kindly let me know what package do I import to get the getTopics() function working.

Any help is appreciated. Thanks.

I need to control multiple differential drive robots.

I wrote a NODE in python which is able to control the robot i.e. publishes velocity and steering of robot using some sensor feedback.

Now I am copying the same code again and again with different names eg controller1.py controller2.py etc
Inside the codes the change is just one variable (name='bot_0' or 'bot_1' or 'bot_2' and so on).

Thus, I was thinking if there is some way in which I can replicate the node from roslaunch and pass one argument. This will make code more scalable and manageable.

Kindly provide your inputs.

The link to the question on gazebosim : here

Hi Jubeira, If it is possible please do add more information to your answer regarding the mapping technique used. Meanwh

Hello everyone,

I came across these sample applications for android : android_apps

There are three applications : make_a_map, map_manager, map_nav

I looked into the source code for make_a_map and could not comprehend if it is using mapping somewhere. I can see the following imports

then I see the nodemain being initialized and executed

then

Even if mapping is involved, it must be visual map, how is it being converted to occupancy grid (I saw one snapshot in the issues section on github repo!)?

My Question: 1. Does the app make_a_map do mapping on Android phone (standalone)? 2. In case mapping does happen on android phone what algorithm is used to map image to occupancy grid?

@gvdhoorn It might sound funny but I have forgotten my gazebo login password, And when I'm trying the recover option on

@gvdhoorn It might sound funny but I have forgotten my gazebo login password, And when I'm trying the recover option on

Thank you for the response. It cleared some of my doubts.

Collada File flicker in gazebo I need to load ArUco marker inside gazebo environment. I created a Cuboid with sketchup,

Hi jubeira, Thanks for answering. I want to know if there is any active development going on with rosjava ? Of the three

How does mapping work on Android (ROSjava)? Hello everyone, I came across these sample applications for android : andro

How does mapping work on Android (ROSjava)? Hello everyone, I came across these sample applications for android : andro

Interpreting the data published on /camera_info topic I am using camera plugin with a robot in gazebo simulator. When I

I am using camera plugin with a robot in gazebo simulator. When I echo the /camera_info topic I receive the following data_frame

header: 
  seq: 69
  stamp: 
    secs: 1417
    nsecs: 503000000
  frame_id: "leader/camera_link"
height: 480
width: 640
distortion_model: "plumb_bob"
D: [0.0, 0.0, 0.0, 0.0, 0.0]
K: [381.36246688113556, 0.0, 320.5, 0.0, 381.36246688113556, 240.5, 0.0, 0.0, 1.0]
R: [1.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 1.0]
P: [381.36246688113556, 0.0, 320.5, -26.69537268167949, 0.0, 381.36246688113556, 240.5, 0.0, 0.0, 0.0, 1.0, 0.0]
binning_x: 0
binning_y: 0
roi: 
  x_offset: 0
  y_offset: 0
  height: 0
  width: 0
  do_rectify: False

In the above frame it appears to me that P has the camera matrix (first 9 entries) data. However, the content of K also look similar. I couldn't find the explanation of these variables.

Question:
What do K and P values represent in the /camera_info topic ?

Awesome. Exactly what I was looking for. I googled various keywords but didn't reach this one.

Interpreting the data published on `/camera_info` topic I am using (camera plugin)[http://gazebosim.org/tutorials?tut=ro

Interpreting the data published on `/camera_info` topic I am using (camera plugin)[http://gazebosim.org/tutorials?tut=ro

@Tony10012 Thank you for answering. However, this does not answer my query, the application you have pointed uses the C

@Tony10012 Thank you for answering. However, this does not answer my query, the application you have pointed uses the C

@Tony10012 Thank you for answering. However, this does not answer my query, the application you have pointed uses the C