pauljurczak's profile - activity

Compilation errors with ROS Melodic on Ubuntu 18.04 and gcc-10 I have roscppproject using ROS Melodic on Ubuntu 18.04. I

Compilation errors with ROS Melodic on Ubuntu 18.04 and gcc-10 I have roscppproject using ROS Melodic on Ubuntu 18.04. I

Is there a tf equivalent of tf2::doTransform? I'm having some issues with tf2.

How to transform Vector3 with tf::Transform? I have a position Vector3 pWorld in WORLD coordinate system and I have a tf

How to transform Vector3 with tf::Transform? I have a position Vector3 pWorld in WORLD coordinate system and I have a tf

There are two constructors of tf2_ros::TransformListener:

1. TransformListener(tf2::BufferCore& buffer, const ros::NodeHandle& nh, bool spin_thread)

2. TransformListener(tf2::BufferCore& buffer, bool spin_thread)

It seems that nh parameter in the first one is ignored, so they are equivalent. Is it accurate?

I'm using tf2_ros::TransformListener listening on /tf topic, which contains various target_frame and source_frame pairs. I want to extract only a specific pair, say IMU and TURTLE. That pair is published at 250Hz according to rqt.

When I call: buffer.lookupTransform("IMU", "TURTLE", ros::Time(0)) I get "IMU" passed to lookupTransform argument target_frame does not exist exception most of the time, but occasionally a good result.

When I call: buffer.lookupTransform("IMU", "TURTLE", ros::Time::now()) or buffer.lookupTransform("IMU", "TURTLE", ros::Time::now()-ros::Duration(0.1)) I get Lookup would require extrapolation into the future... or Lookup would require extrapolation into the past...

What is a reliable way to retrieve the most current transform with given target_frame and source_frame?

EDIT

The issue was caused by simulation startup delay. waitForTransform() as suggested in the answer below is the solution to my problem. Even better is its newer incarnation: tf2_ros::Buffer::canTransform().

How to get a specific latest transform from lookupTransform I'm using tf2_ros::TransformListener listening on /tf topic,

How to get a specific latest transform from lookupTransform I'm using tf2_ros::TransformListener listening on /tf topic,

How to get a specific latest transform from lookupTransform I'm using tf2_ros::TransformListener listening on /tf topic,

How to get a specific latest transform from lookupTransform I'm using tf2_ros::TransformListener listening on /tf topic,

Which constructor of tf2_ros::TransformListener should I use? There are two constructors of tf2_ros::TransformListener:

Which constructor of tf2_ros::TransformListener should I use? There are two constructors of tf2_ros::TransformListener:

How to subscribe to subset of /tf messages with given frame_id? In my simulation environment /tf topic publishes tf2_msg

How to subscribe to subset of /tf messages with given frame_id In my simulation environment /tf topic contains tf2_msgs/

How to subscribe to subset of /tf messages with given frame_id In my simulation environment /tf topic contains tf2_msgs/

PlotJuggler does indeed show complete data in my case.

Inconsistent plot vs numerical data display in rqt I'm running ROS Melodic on Ubuntu 18.04. When I visualize a rosbag wi

@gvdhoorn Sorry for the delay, I didn't see your comment. BTW, when I leave Firefox tab with my question open, Asked: 46

Inconsistent plot vs numerical data display in rqt I'm running ROS Melodic on Ubuntu 18.04. When I visualize a rosbag wi

Inconsistent plot vs numerical data display in rqt I'm running ROS Melodic on Ubuntu 18.04. When I visualize a rosbag wi

One argument for using rviz is it's visualization of laser scans, which is absent in rqt as of the end of 2019.

@gvdhoom That would be too much typing ;-) I just edited that page - have a look.

@Delb It took me a while to understand what you meant. It is certainly beyond any search engine capability. I'm going to

ROS_INFO macro accepts C-style printf formatting parameters as in this example from "Mastering ROS'": ROS_INFO("From C

@gvdhoom - -> _: thank you for the tip!