SurajJadhav's profile - activity

I'm trying to understand the pointcloud2 data extracted from a bag file. The contents of one sample message is as follows:

header: 
  seq: 0
  stamp: 
    secs: 1317022486
    nsecs: 689719915
  frame_id: "velo_link"
height: 1
width: 119597
fields: 
  - 
    name: "x"
    offset: 0
    datatype: 7
    count: 1
  - 
    name: "y"
    offset: 4
    datatype: 7
    count: 1
  - 
    name: "z"
    offset: 8
    datatype: 7
    count: 1
  - 
    name: "i"
    offset: 12
    datatype: 7
    count: 1
is_bigendian: False
point_step: 16
row_step: 1913552
data: [131, 64, 23, 66, 223, 79, 141, 61, 201, 118, 190, 63, 236, 81, 184, 62, 31, 133, 25, 66, 184, 30, 5, 62, 96, 229, 192, 63, 61, 10, 87, 62, 74, 140, 26, 66, 55, 137, 129, 62, 74, 12, 194, 63, 61, 10, 87, 62, 45, 178, 26, 66, 0, 0, 192, 62, 14, 45, 194, 63, 82, 184, 158, 62, 240, 39, 27, 66, 219, 249, 254, 62, 33, 176, 194, 63, 236, 81, 56, 62, 100, 59, 32, 66, 147, 24, 36, 63, 39, 49, 200, 63, 143, 194, 117, 62, 166, 155, 32, 66, 47, 221, 68, 63, 117, 147, 200, 63, 0, 0, 0, 0, 190, 31, 35, 66, 57, 180, 104, 63, 150, 67, 203, 63, 143, 194, 245, 61, 213, 248, 40, 66, 14, 45, 146, 63, 252, 169, ...................................]

I m just trying to match the numbers here.

data [ ] has 1913552 number of elements in it.

row_step says there is 1913552 bytes data in data array.

There are 4 elements per point: x, y, z, i. Each of 1 byte.

Thus the total number of point clouds in this captured message is: 1913552/4 = 478388.

But according to explanation given here, "If the cloud is unordered, height is 1 and width is the length of the point cloud.". That is width denotes the total number of point clouds in the message. But above calculated total number of point clouds (478388) is not matching with width(119597) given in message information. Please explain this mismatch/misunderstanding.

@rkeatin3, were you able to achieve point cloud display using MessageFilterDisplay class?

Using PointCloud2Display class How to utilise PointCloud2Display class to display point cloud data on a render panel, I

Using PointCloud2Display class How to utilise PointCloud2Display class to display point cloud data on a render panel, I

I have tried generating the same error with the same content of your CMakeLists.txt, it is working fine for me. Can you

Please mention the environment details like ROS, OS version, etc.

.pcd files are saved in two formats: 1. bin 2. ASCII This format is chosen while saving the file. If your file is s

.pcd files are saved in two formats: 1. bin 2. ASCII This format is chosen while saving the file. If your file is s

.pcd files are saved in two formats: 1. bin 2. ASCII This format is chosen while saving the file. If your file is s

.pcd files are saved in two formats: 1. bin 2. ASCII This format is chosen while saving the file. If your file is s

pcl::PCDWriter writer; // Save DoN features writer.write<PointXYZI> (outfile, *points, true); }

I m using ROS noetic in Ubuntu 20.04 with Qt5. I m trying to develop a module to visualize point cloud data on a 3D visualizer. I noticed RViz utilises a 3D visualizer as highlighted in below image:

I m interested to integrate only that window in my Qt project. How can I include it?

I have worked earlier on similar project and used VTK library's 3D visualizer window plugin(QVTK Plugin) in Qt. Now I want to replace the VTK library dependency.

Thanks @Osilva and @Ranjit Kathiriya, I m going through the RViz project and it is huge, for now I m going to survey, wh

Thanks user: Osilva and user: Ranjit Kathiriya, I m going through the RViz project and it is huge, for now I m going to

Thanks Osilva and Ranjit Kathiriya, I m going through the RViz project and it is huge, for now I m going to survey, what

Thanks @Osilva and @Ranjit Kathiriya, I m going through the RViz project and it is huge, for now I m going to survey, wh

Add 3D visualizer in Ros-Qt project I m using ROS noetic in Ubuntu 20.04 with Qt5. I m trying to develop a module to vis

I m aware about the RViz's functionality and visualizing camera and point cloud data in it, I m trying to develop a Qt a

Add 3D visualizer in Ros-Qt project I m using ROS noetic in Ubuntu 20.04. I m trying to develop a module to visualize po

I have worked with ROS packages earlier which uses catkin environment. I have also worked on Qt projects developed in Qt Creator which does not use catkin environment.
I have also seen Qt projects in ROS like Image Viewer.
Qt has different build folder and the items inside it whereas catkin has different directory structure. My query is how to use Qt in ROS environment?

Thank you.

I m using Qt5 in Ubuntu 20.04 and ROS noetic.
Generally the directory structure for ROS Qt project is:

This can also be seen here in a standard ros_qt project.

But when I create a ROS package in Qt, following directory structure is created:

Do we have to create other folders and files manually?
What about .ui file, I think it should have been created by the Qt Creator, What am I missing?

:D, currently not credible enough to do that.

After conducting experiments on the answer provided by @Ranjit Kathiriya , I was able to find that the directory structu

Another question remains: If I create all files and leave them blank, the Qt Creator doesn't accept them. For example I

Another question remains: If I create all files and leave them blank, the Qt Creator doesn't accept them. For example I