CloudCompare forum

daniel wrote: Thu Jun 06, 2019 7:24 pm We use here and there some conjugate gradient or Levenberg Marquardt algorithms (with Eigen).

The use of conjugate gradient or Levenberg Marquardt algorithms is interesting for me, can you specify where they are used in CC?

Thanks for that

Zilong

The method uses a 'RANSAC' algorithm. It's a random process (a certain number of points is picked several times and the best match is returned - the number of points and the number of trials is given by some magical statistics formula ;). This way the process is relatively robust to noise ...

You mean by setting the line 219 of std::mt19937 gen(rd()); to std::mt19937 gen(0); ?

From https://github.com/CloudCompare/CloudCo ... gTools.cpp

Hello, Daniel,

I am using the compiled version of CloudCompare, and I am trying to sample points from a mesh with the function cloud = ccmesh->samplePoints(true, 4.0, true, false, false, nullptr); however, with the same mesh (.stl) and the same parameters, each time the resulted point cloud is not ...

daniel wrote: Tue May 07, 2019 8:35 pm If the random sampling limit is above both cloud sizes, you shouldn't have any 'random' behavior anymore...

However, it's better that the sampling process with the random sampling limit below the point number can be also reproducible, can we do that?

You are right, I thought the Random Sampling Limit is only valid for the cloud to be aligned.
Thanks for your answer.

Best regards

Zilong

Hello, Daniel,

I am using de compiled version of CC, and I find that when using ICP, for the same reference cloud and same aligned clolud, the result transform matrix can be different, even the Random sampling limit is greater than the point number of the cloud to be aligned, however, do you have a ...

Hi, Daniel,

With the source code of CC, I added a new xxx.ui created with Qt Designer, however, if I right click on the xxx.ui file, the option 'compile' is disabled, can you tell me how can I generate a ui_xxx.h for this xxx.ui file?

Best regards

Zilong

Thanks for your confirmation.

Is there a function in CC which gives the minimal distance between any two points in a point cloud?

Daniel,
The transformation history is interesting for a primitive, however, it is not presented in the manual (for a primitive).

I tested with some cases, it's true that the third column of the matrix gives the axis (direction) of the a cylinder.

Something I found :

1. For a plane, the 3rd ...