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2016-06-02 04:56:51 -0500 | asked a question | How to Block all publishers Hi I currently have a mobile platform, would like to create a publisher to latch on at the velocity topic of the platform, and prevent all other nodes from publishing to it, effectively creating a kill switch to the platform. As the platform will perform the latest twist msg sent to it, so I'm hoping to flood it with it with an infinite loops of zeros twist to get the platform to stop moving. Best regards Jhlim6 |
2016-05-23 22:34:08 -0500 | asked a question | Could not find "tf_conversions" package configuration file Hi, I was compiling a ROS node in my raspberry pi (fresh install) and there is a cmake error. I'm using the raspberry in headless mode. The node complied successfully in my computer though. Thank you for helping Much appreciated. James |
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2016-02-17 23:54:12 -0500 | commented question | camerainfo different from the definition ros document hi ahendrix, the document i'm referring to is |
2016-02-17 21:44:55 -0500 | asked a question | camerainfo different from the definition ros document Hi, I notice that when I echo out the camerainfo, left and right, I received a different Projection matrix than what is expected from ros doc. Left: also what is the do_rectify under the section ROI of camerainfo |
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2016-02-11 06:37:30 -0500 | commented answer | PCL removing outliers using radius as condition I used rviz to note that the pointcloud was present prior to filtering. It output the cloud details before filtering, but after that it hangs. |
2016-02-11 06:04:42 -0500 | commented answer | PCL removing outliers using radius as condition Mistake when pasting the code. Statistical outlier removal works for me. But it doesn't fully remove all the noise. |
2016-02-11 03:43:39 -0500 | asked a question | PCL removing outliers using radius as condition Hi I'm using a radius filter to remove outliers from my pointcloud, however the code hangs while creating the filtering object. The code never gotten to the point of outputting the message "cloud after filtering".
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2016-02-11 02:10:10 -0500 | asked a question | Filtering pointcloud with voxel grid giving different number of data points Hi, I try using the voxel grid filter on a pointcloud generated by the Ensenso camera. While the camera is held stationary, it gives a constant number of data points, however with a voxel grid filter of 0.01f (1cm). I've been received different number of data points back. Why is this the case.
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2016-02-11 01:53:01 -0500 | commented answer | memory corruption Thanks, I just realized that line 3 is the critical line, not line 4. That solved my problem of double freeing pointers. |
2016-02-11 01:32:13 -0500 | commented answer | memory corruption hi, I have the same error msg. How do you use CloudConstPtr cloud () ? I got CloudConstPtr was not declared when i tried to use it |
2016-02-10 00:20:01 -0500 | commented answer | subscribe to sensor_msg::PointCloud2 Hi, Its not obvious to me, but why does the ros subscriber fails in the while loop? |
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2016-02-04 03:27:51 -0500 | commented question | Trouble subscribing to pointclouds Hi NEngelhard, I realized that my code is not so comprehensible here, so I asked another qns where i posted the test code. http://answers.ros.org/question/22582... |
2016-02-04 03:24:34 -0500 | asked a question | subscribe to sensor_msg::PointCloud2 Hi, my ros subscriber is having trouble entering the callback. I'm using ROS_INFO to tell me if the callback is in. In the rqt_graph, it shows that the subscriber node is subscribed to the topic that the publisher is publishing. Using rostopic echo "topic", it is displaying a lots of numbers that i'm presuming that it is the pointcloud. below is my code. Publisher Subscriber |
2016-02-04 02:12:59 -0500 | asked a question | Trouble subscribing to pointclouds Hi, I am having troubling using the ROS's sensor_msg to send pointclouds over nodes. From RVIS, i can see the pointcloud being published, and the rqt_graph shows that the subscriber has subscribed to the publisher, but the subscriber is not entering the subscriber callback function. Please help. I've also tried sending pointclouds directly following http://wiki.ros.org/pcl_ros#Publishin... example, but the same issue arises. Below is my code using sensor_msgs ros::Subscriber sub = nh.subscribe<sensor_msgs::pointcloud2>("/ensenso/depth/points", 2, callback); void callback(const sensor_msgs::PointCloud2ConstPtr& cloud) { ROS_INFO ("inside callback"); } void sender ( const boost::shared_ptr<pcl::pointcloud<pcl::pointxyz> >& cloud) { sensor_msgs::PointCloud2 cloud_msg; pcl::toROSMsg (* cloud, cloud_msg); cloud_pub_.publish(cloud_msg); } |