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2021-10-12 08:47:54 -0500 commented answer Chain transformations manually

Hi Mike! My world_to_ir_matrix looks different. Could you print out world_to_link_matrix and link_to_ir_matrix as well?

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2021-10-12 03:46:11 -0500 asked a question Chain transformations manually

Chain transformations manually Hi there! I am using ROS Noetic on an Ubuntu 20.04 machine. What I am trying to do is to

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2021-04-23 06:49:45 -0500 asked a question Writing PointCloud2 Rviz Display Plugin

Writing PointCloud2 Rviz Display Plugin Hi! I would like to be able to visualize a message like this in Rviz: Header he

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2020-12-14 01:22:28 -0500 edited question Using rosrun within virtual environment

Using rosrun within virtual environment Hi! I am trying to run a ros node within a python virtual environment, a procedu

2020-12-11 09:10:41 -0500 asked a question Using rosrun within virtual environment

Using rosrun within virtual environment Hi! I am trying to run a ros node within a python virtual environment, a procedu

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2020-01-23 01:55:08 -0500 commented answer Remapping topics of included launch files

Hi! Unfortunately, that does not work. Also, if I place the <remap from="rostopic_remap" to="rostopic_remap_outside"

2020-01-22 10:34:06 -0500 asked a question Remapping topics of included launch files

Remapping topics of included launch files Hi! I am trying to write a launch file where I include another launch file. Ad

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2019-12-19 09:19:49 -0500 commented question No matching function for advertiseService

Hey, thanks, but no, that does not help.

2019-12-19 06:41:03 -0500 commented question No matching function for advertiseService

@l4ncelot okay, I edited my question :)

2019-12-19 06:40:15 -0500 edited question No matching function for advertiseService

No matching function for advertiseService Hi! I am trying to add a service to the Kinect2 Bridge of the iai_kinect2 pro

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2019-12-19 03:09:24 -0500 asked a question No matching function for advertiseService

No matching function for advertiseService Hi! I am trying to add a service to the Kinect2 Bridge of the iai_kinect2 pro

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2019-04-08 01:17:37 -0500 marked best answer Order of transformations

Hi!

I am confused about in which order to multiply transformations. Suppose I want to create a transformation that transfers a point from the WORLD frame to a frame called GOAL. I do have the transformations from WORLD to another frame TMP, and from TMP to GOAL (could for example be transformations obtained via a tflistener).

My intuition tells me that the transformation I want is (TMP->GOAL)*(WORLD->TMP), because that would first apply WORLD to TMP and then TMP to GOAL to a point. It however seems that (WORLD->TMP) * (TMP->GOAL) is correct in order to be published. This would make sense to me if ROS pre-multiplied points (i.e., p * M instead of M * p). Is that the case? If not, why else would that be?

Edit: I know that the tf package handels most of these things. However, I believe that there are cases where one should be able to do these transformations himself and I want to understand how this chaining works. I'd also be happy with hints to a good article or similar.

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2018-08-22 03:09:36 -0500 asked a question Image transport: Cannot set parameters

Image transport: Cannot set parameters Hi! I have set up an image transport publisher like so: image_transport::Imag

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2018-07-09 03:33:16 -0500 asked a question Is it more "rossy" to publish to one topic and later distinguish msgs?

Is it more "rossy" to publish to one topic and later distinguish msgs? Hi! I guess I have a quite general question. Ima

2018-07-09 03:26:18 -0500 commented question yaml error in rosservice call

Thanks, I opted for tab-completion. Even though I still do not quite understand why this does not work, since it works,

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