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The TurtleBot uses Kinect to see the world in 3D and for detecting and tracking objects. \n+\n+## Prerequisites\n+\n+First of all, make sure you have the openni packages installed:\n+{% highlight sh %}\n+sudo apt-get install ros-indigo-openni-*\n+{% endhighlight %}\n+\n+You can check the active 3D sensor of Turtlebot by running:\n+{% highlight sh %}\n+echo $TURTLEBOT_3D_SENSOR\n+{% endhighlight %}","path":"_posts/2015-02-03-4.markdown","position":23,"original_position":23,"commit_id":"4faac0f9e2ae30baa2cedb869e4b8416c6f194d1","original_commit_id":"4faac0f9e2ae30baa2cedb869e4b8416c6f194d1","user":{"login":"tfoote","id":447804,"avatar_url":"https://avatars.githubusercontent.com/u/447804?v=3","gravatar_id":"","url":"https://api.github.com/users/tfoote","html_url":"https://github.com/tfoote","followers_url":"https://api.github.com/users/tfoote/followers","following_url":"https://api.github.com/users/tfoote/following{/other_user}","gists_url":"https://api.github.com/users/tfoote/gists{/gist_id}","starred_url":"https://api.github.com/users/tfoote/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/tfoote/subscriptions","organizations_url":"https://api.github.com/users/tfoote/orgs","repos_url":"https://api.github.com/users/tfoote/repos","events_url":"https://api.github.com/users/tfoote/events{/privacy}","received_events_url":"https://api.github.com/users/tfoote/received_events","type":"User","site_admin":false},"body":"It would be great to give examples of a good output vs an incorrect output, both empty or set otherwise. ","created_at":"2015-12-30T16:55:39Z","updated_at":"2015-12-30T16:55:39Z","html_url":"https://github.com/tfoote/turtlebot-tutorial/pull/4#discussion_r48615784","pull_request_url":"https://api.github.com/repos/tfoote/turtlebot-tutorial/pulls/4","_links":{"self":{"href":"https://api.github.com/repos/tfoote/turtlebot-tutorial/pulls/comments/48615784"},"html":{"href":"https://github.com/tfoote/turtlebot-tutorial/pull/4#discussion_r48615784"},"pull_request":{"href":"https://api.github.com/repos/tfoote/turtlebot-tutorial/pulls/4"}}},"pull_request":{"url":"https://api.github.com/repos/tfoote/turtlebot-tutorial/pulls/4","id":54163370,"html_url":"https://github.com/tfoote/turtlebot-tutorial/pull/4","diff_url":"https://github.com/tfoote/turtlebot-tutorial/pull/4.diff","patch_url":"https://github.com/tfoote/turtlebot-tutorial/pull/4.patch","issue_url":"https://api.github.com/repos/tfoote/turtlebot-tutorial/issues/4","number":4,"state":"open","locked":false,"title":"Added posts in simulation track","user":{"login":"nampi","id":15351491,"avatar_url":"https://avatars.githubusercontent.com/u/15351491?v=3","gravatar_id":"","url":"https://api.github.com/users/nampi","html_url":"https://github.com/nampi","followers_url":"https://api.github.com/users/nampi/followers","following_url":"https://api.github.com/users/nampi/following{/other_user}","gists_url":"https://api.github.com/users/nampi/gists{/gist_id}","starred_url":"https://api.github.com/users/nampi/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/nampi/subscriptions","organizations_url":"https://api.github.com/users/nampi/orgs","repos_url":"https://api.github.com/users/nampi/repos","events_url":"https://api.github.com/users/nampi/events{/privacy}","received_events_url":"https://api.github.com/users/nampi/received_events","type":"User","site_admin":false},"body":"Added posts: 4(a draft), 5.\r\nUpdated posts: 2, 3. 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