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2015-06-25 14:58:38 -0500 received badge  Teacher (source)
2015-06-25 14:38:33 -0500 answered a question How to merge two point clouds

http://wiki.ros.org/octomap This should help you!

Also, for the latter part of your question - why dont you have a look at this PCL tutorial? http://pointclouds.org/documentation/...

They register a series of pointclouds, and then "merge" them together as one.

2015-06-25 14:32:56 -0500 commented question error when I included PCL passthrough filter

We need more information! What functions are you trying to implement? What is your application? Generally speaking, I use nodelets wherever I can to implement PCL filters.

2015-06-25 14:26:12 -0500 commented question pcl_ros VoxelGrid strange behavior

I am little confused by what you mean here - "I have from 0 to 100 points after VoxelGrid filtering". Do link your repo here, so that we can have a look and maybe understand whats wrong.

2015-06-25 13:57:31 -0500 answered a question Hokuyo urg_node documentation error

Yup. The package and node names have changed. But, the getID node is still present in the newer package as seen through the package cmakelists. https://github.com/ros-drivers/urg_no...

I havent tried it yet - so I dont know if they fixed this issue yet or not https://github.com/ros-drivers/urg_no...

2015-06-25 13:57:31 -0500 answered a question Difficulty to use Laser scanner with URG_NODE

Try

rosrun urg_node getID /dev/ttyUSB0

If you have a look at the CMakeLists for the new package(urg_node), it should show you the new names wherever used.

The documentation for urg_node hasn't yet been updated I guess. It is almost still the same as the documentation for the older hokuyo_node package.

For the latter part of the question - I doubt that it really makes much of a difference as long as set it to the right device at initialization. You might want to have a look at this - ofcourse not on the same package anymore http://answers.ros.org/question/45850...

2015-06-25 13:34:42 -0500 received badge  Supporter (source)