CloudCompare forum

Hi guys,
I'm Niccolò de Ruvo, a student of the International Course on Architectural Design in Florence. I'm doing a master's thesis on the Automated City Site Modeling using a 3D cloud point from a laser scanner. I'm in a very starting point and after reasearches I found that CC can help me with RANSAC and CANUPO. I'm working on an ancient fortress that is like a small district of a city, with green, buildings, streets and empty spaces. I have to automatically distinguish those elements. Am I on the right way? Can you suggest me something that can help me?

Thank you.

I fear Ransac is a bit too simple for what you are trying to achieve, even though it can give interesting results and it may be a starting point for something more evolved.

And CANUPO is used to classify natural scenes or specific features (such as powerlines, etc.). I don't know how it would perform for the purpose of segmenting architectural buildings.

There are hundreds of fancy algorithms and methods for this purpose... but I don't know if any of these have ever reached an open-source (or even commercial) application.

Since this is my first post in the CC forum, I'll start by thanking the entire CC Team for the great job.
It would have really been such a huge pain for me without you guys. I work in a domain where we model out-door scenes from point clouds from LiDAR and SfM/MVS, thus it is normal to have 800+ Mio. 3D Points.

Now to your question:
For the task of City Modeling from point clouds, RANSAC can really be limiting. I ran into the same problems last year and finally had to devise my own algorithm. Currently am discussing with my project partners to see if I can release the code. Meanwhile, you can look at the results in the following paper. If you think this may bring you ahead towards your task, then you/we may want to give it a try ?

Paper: "Contiguous Patch Segmentation in Pointclouds"
http://link.springer.com/chapter/10.100 ... 45886-1_11

If you are well versed in stochastic processes then I can assist you to re-implement the things, whilst am waiting for my folks to agree that we release the code. Am sorry if this is a bit challenging to understand, RANSAC wasn't really working for me, hence something a bit grey.


Sure, if am allowed to release the code and CC see the need for it, then, this will really be a great opportunity.

I'm pretty sure a lot of people will be interested to have the ability to test your algorithm (in CloudCompare even more ;).

I shall give a presentation of CloudCompare at 3D Arch 2017 (http://www.3d-arch.org/). I'm sure it would be a great hit if we could have a running version by then!

Daniel, thank you for your prompt response.

I'll keep you and this thread too updated as things unfold.

Regards
William

Is it possible for you to send me a pdf version of the article (cloudcompare [at] danielgm.net)?

Thanks,