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QUESTION
I have large point clouds (each with several million points) and want to compute geometric attributes for all points. In order to do so, I need to calculate eigenvalues. How can I do this as quickly as possible? My data is stored in *.las files and I read them in with the package lidR. I also use this package to calculate point metrics. According to this post, I implemented this version:
...ANSWER
Answered 2021-May-02 at 11:41The problem of point_metrics() is that it calls user's R code millions of times and this have a cost. Moreover it cannot be safely multithreaded. The function is good for prototyping but for production you must write your own code. For example you can reproduce the function segment_shape() with point_metrics() but segment_shape() is pure C++ and multi-threaded and is often an order of magnitude faster.
Let try with ~3 millions points. The two examples are not equivalent (different output) but the computation load is almost the same (eigen value decomposition).
QUESTION
I'm working on my master thesis to simulate hemispherical photographs from Lidar-Data. So my main goal is to project 3D Points (X,Y,Z) which are in a cartesian coordinate system to a stereographic projection (See picture 1, from: here). The coordinate-system of my Pointcloud is transformed so that the center point is located a (0,0,0) and all z-values are positive.
I'm coding in RStudio and I first tried to achieve a spherical projection of the Pointcloud by using the formula for cartesian to spherical coordinates listed on wikipedia.
...ANSWER
Answered 2020-Sep-25 at 08:27It's difficult to show this result in 3D, but I'll try my best.
Suppose we have a collection of points in the shape of a cross suspended over the camera, paralell to the ground:
QUESTION
I am trying to write some xyz point data to a .ply file using python.
I am using this script here which basically writes a pandas DataFrame to a binary format via a recarry and numpy method tobytes():
ANSWER
Answered 2019-Oct-03 at 10:24The difference between made_with_code.ply and made_with_windows.ply is that in the latter, all decimals are rounded to 2 decimals as you can see with:
QUESTION
I tried to mount other hard drive in CloudCompare, and tried the link and the command already, but still didn't work. Could someone tell me how to fix it? thx
...ANSWER
Answered 2019-Jul-24 at 23:28I use CloudCompare v2.10.1, and the code works for me.
QUESTION
I installed CloudCompare on my ubuntu machine using snap but I cannot launch the application. I get the following error message:
QXcbConnection: Could not connect to display :0 Aborted (core dumped)
If I enter $sudo cloudcompare.CloudCompare instead of just cloudcompare.CloudCompare, I get the same with one more line that is :
mkdir: cannot create directory '/run/user/0': Permission denied
Even when changing acces control and permissions this won't go away.
I have the following GPU: NVIDIA GF106GL (Quadro 2000)
And I am on ubuntu 16.04 LTS
I tried changing the access privileges, removing and re-installing both snapd and cloudcompare, updating my GPU drivers but nothing works.
If anyone has an idea, I would be relieved to hear it :)
...ANSWER
Answered 2019-May-22 at 05:35Somehow installing Meshlab with snap fixed the issue for me : after the installing process was completed, I tried launching CloudCompare again and it works !
Hopefully, this will be useful to someone else :)
QUESTION
I am trying to update the following repository https://github.com/ilyas-it83/CloudComparer
I cloned it, done some updates to the file and now I try to push it for a new pull request.
I am using 2FA on my github account so after stackoverflowing I generated access key.
Here is my github version
...ANSWER
Answered 2018-Dec-07 at 14:13Do you own the repository or are you trying to submit a PR to someone elses?
Sounds like this is just someone else's repo you're trying to make a PR onto.
If that's the case you need to fork the repo, which you can do on the repos page (https://github.com/ilyas-it83/CloudComparer).
Then once you make the changes, click on pull requests and then new pull request and select your forked repo.
QUESTION
If you look at the Python examples provided on VTK's wiki you'll see that most (all?) viewers have mouse controls that may feel strange. For instance in the Cylinder Hello world the object moves in a direction that depends of where you click in the window (regardless of where the object is). The rotation function similarly at a speed proportional to the distance from the window's center.
Is it possible to change the camera control style to "trackball" ? i.e. to something closer to the behavior of Blender, Meshlab or CloudCompare...
...ANSWER
Answered 2018-Apr-09 at 14:40It took me quite a while to find the solution:
QUESTION
I am reading 2.2 million points from a pcd-file, and loadPCDFile is using ca 13 sek both in Release- and Debug mode. Given that visualization programs like CloudCompare can read the file in what seems like milliseconds, I expect that I am doing something harder that it needs to be.
What am I doing wrong?
The top of my pcd-file:
...ANSWER
Answered 2017-May-02 at 08:56This looks correct, when comparing with a pcl example. I think the main work of loadPCDFile is done in the function pcl::PCDReader::read, which is located in the file pcd_io.cpp. When checking the code for binary data, as it is in your case, there are 3 nested for loops which check if the numerical data of each field is valid. The exact code comment is
QUESTION
This page says the following:
point clouds coming from structured/gridded files (such as PTX, DP or FARO) are now associated to a simple grid structure. This structure will mainly be used to export the cloud in a structured format, but it can also be used when computing normals for instance.
What kind of grids can be associated with a point cloud?
Are there format standards and definitions for those kinds of grids?
ANSWER
Answered 2017-Mar-08 at 15:48If you read a little further on that same page, there is a explanation of what kind of structures can be associated with a point cloud.
However I think that the word "gridded" files might be confusing you.
As you can read here: A gridded file format is just a file that contains not only XYZ, RGB and/or intensity information but also some matrix that can be used to generate planar views of scans.
Here is the specification of the PTX format.
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