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Yes, the 2 methods have very different ways of working. One projects the points inside a plane and use an expansive algorithm to try to determine the concave hull, and the other simply relies on a regular grid (just as the 'Rasterize' tool). Thank you for your reply! Now I understand how it works.

I guess it depends on the grid step? (but I may misunderstand what happens ;) Sorry, I haven't made my problem clear. I upload the result in the attachment. The envelop (green line) is extending into arbitrary directions, while the contour (white line) goes in several regular directions. I think yo...

Have you tried the new 'extract contour' tool in the 2.12 version? It's the way to go if you want multiple contours (for each 'island'). Otherwise, the envelope is always unique inside a slice. Thank you, Daniel. I've tried "extract contour" and that works fine. BTW, I found that the gene...

Dear guys, I'm new to the cross section tool, so I try to follow the tutorial in https://www.cloudcompare.org/doc/wiki/index.php/Cross_Section#Extract_contours_inside_a_single_slice What I try to produce is several envelope polylines in each slice, but I always get envelops that are connected to eac...