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2015-11-13 13:41:13 -0500 | asked a question | publishing marker points python I have some problems publishing markers in a python node to visualize them on rViz. I have a node that calculates some static points and I want to visualize them (like a path). I also have a robot moving and I want to drop some marks when it reaches some points. I don't want to make an infinite cycle to visualize them, otherwise the rest of the code will not go on. Here is a method that I wrote to visualize the points in the path and it worked sometimes, now I don't know why does never appear anything on rViz: As you can see I tried to use the lifetime and 0 should mean infinite time. I also published the points more times because I've seen that sometimes rviz needed 2-3 times to receive the points. Now it doesn't work anymore. |
2015-10-07 10:59:42 -0500 | asked a question | Using launch file: tf.Exception: Lookup would require extrapolation into the past Hi, I am using two nodes: the first is a stage from stage_ros, the second is a controller for the robot that I wrote in python. I started using the nodes separately, launching the first from a launch file: The second from terminal with "rosrun ...". In this way all works fine. If I try to insert the second node in the launch file modifying the launch file in this way and now I have some problems with the tf transformation that was working perfectly before. Here is the error that I get when I launch the new launch file: Here is the code that can have something to do with the transformation: So the problem is that I don't understand why it was working launching the two nodes separately and why is not working with the two nodes in the same launch file |