Questions tagged [transformations]

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How to get the world coordinates with position and orientation in ROS 2 Humble

I am using ROS 2 Humble. A person is supposed to take a photo of an AR marker with a camera. Inside the system, we can obtain the relative coordinates, position (x, y, z), and rotation, orientation (x,...
aotombo's user avatar
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ROS1 /tf incompatible with ROS2 through ROS1 bridge

I am having trouble getting the /tf topic into ROS2 through the ROS bridge. I am using ROS melodic and ROS2 eloquent on Ubuntu 18.04. When I run my node which tries to perform a lookup for a specific ...
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How to transform a vector in rospy?

I couldn't find any tutorials for my situation. I have a vector (23.7, 0, 0) and I want to transform (only rotation no translation needed) it into another frame which is RPY (0.39, 0, 1.64). I'm ...
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What exactly does it mean to "send a transformation from the child to the parent frame"?

First of all, I would like to say that I have some background in computer graphics (e.g., I know what homogenous transformations, etc., are). So, please, do not explain to me what matrix ...
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How to perform rotation before translation in tf2?

Given the rpy values and some translational values , how to perform rotation before translation and then publish while using the tf2 library in ros Originally posted by nikhilk on ROS Answers with ...
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How to use your custom map for turtlebot navigation in simulation?

Hello all, I have built a custom map of my building and I want to use it in simulation (Rviz) to test my code. In simple words, I want some like turtlebot_stage turtlebot_in_stage.launch with my map ...
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why the tf.transformPoint is giving tf exception?

I am trying to transform a point from a base_link frame to camera frame. When run the below code getting error message "Exception: Lookup would require extrapolation into the future. canTransform ...
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Why TransformListener initializiton giving an AttributeError?

I am trying to transform a point from a map frame to camera frame. But i was getting an AttributeError. I followed this api and wrote the following code. ...
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4 answers
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Quaternion transformations in Python

I'm trying to place some Markers in RViz, using a node written in Python. To this end, I need to create a geometry_msgs.mgs.Pose with an ...
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ROS Answers SE migration: Tree frames tf

Hi, This is my scenario: image description http://subir.cc/images/img201ryr.jpg In a node I publish the webcam image and retrieve the coordinates x,y when the user clicks on the screen. After I ...
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"intersect" several transformations

Hi all, I have a node that will lookafter two transformations. My problem is that both have different frequencies and I with the information os these two I have to publish a new one. So I want to know ...
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imu frame for Robot_pose_ekf

Hi all... i'm trying to use the robot_pose_ekf node with an pioneer 3at robot using odometry from p2os_driver and an imu MT_9 i publish the sensor_msgs/imu using the frame: "imu" and a frame ...
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Transform PoseWithCovariance

Is there any funcionality in the tf library which allows transforming PoseWithCovariance msgs to a different frame? It should consider not just the pose transformation but also the covariance eigen ...
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Error assigning a python quaternion

Hi, I have tried to setup navigation stack to work with the robot from USARSim the same way as in tutorials, but when I start robot_configuration.launch and move_base.launch I get this error related ...
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