Convex hull using cross section

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KoaVampassel
Posts: 2
Joined: Wed Feb 18, 2026 8:25 am

Convex hull using cross section

Post by KoaVampassel »

Hi,

I manually segmented some trees and want to use to cross section tool to generate some envelopes as its described in the wiki here: https://www.cloudcompare.org/doc/wiki/i ... ss_Section. My goal is to get convex hulls.
What I understood is that the concave hull algorithm starts as a convex hull and then starts splitting. When i hover over the 'max edge length' parameter field, a small tool tips pops up which is saying that when the value is 0, a convex hull is generated. In the wiki this is not explicitly stated.
When I run the tool with the value 0, concave hulls a generated, which makes sense for the value 0 if it were not special.

So my questions is, whether the generation of the concave hull is intended or whether the convex hull should be generated. For my case i simply use a high enough value for the 'max edge length' parameter as a workaround, but since the algorithm starts at a convex hull, it would be nice to be able to simply use that starting hull. I added a screenshot for your understanding.

Thank you very much for your software! :)
Screenshot 2026-02-18 092355.png
Screenshot 2026-02-18 092355.png (315.52 KiB) Viewed 7018 times
daniel
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Re: Convex hull using cross section

Post by daniel »

So you mean that you don't get the convex hull when using 0 as parameter? You get instead the result in your screenshot? That's definitely not intended.

Just in case, have you tried with the latest 2.14.beta version?
Daniel, CloudCompare admin
KoaVampassel
Posts: 2
Joined: Wed Feb 18, 2026 8:25 am

Re: Convex hull using cross section

Post by KoaVampassel »

Hi,

Thank you for your response

Yeah exactly. When I'm using 0 as a parameter, I get the concave hull instead of the convex hull.
I just tested it with 2.14 beta version and the same problems still occurs.
daniel
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Joined: Wed Oct 13, 2010 7:34 am
Location: Grenoble, France
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Re: Convex hull using cross section

Post by daniel »

Here is a fixed version: https://www.cloudcompare.org/release/Cl ... up_x64.exe

(sadly, it's a non-signed version as I have some issues with my certificate - you'll have to convince Windows that it's safe to run)
Daniel, CloudCompare admin
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