How to merged meshes thanks to Surface-based in cloudCompare

[Marie1996]

Hello,

I would like to know if this functionality is available in Cloud compare : I would like to merge different meshes by selecting a surface and not only points.

I don't want to use ICP either.

Otherwise, do you know an other software (opensource) able to do that ?

Thanks in advance,

[daniel]

What do you mean by 'selecting a surface and not only points' exactly?

Anyway, CloudCompare can merge two meshes into one, but the triangles from both meshes are simply copied next to each others, the vertices are not merged if they are at the same position, and triangles are not connected/stitched.

[Marie1996]

I would like to use the surface-based method to merge two meshes. I would like to selectionate a zone, and use it for surperimposition. It's an other method for superimposition of different scans. I put an illustration in attachment.

Do you know how to do it with Cloudcompare ?

[daniel]

Well, only with ICP...

[Marie1996]

Thank you for your answer,

But, do you know if it's possible to use the ICP algorithm only on a small surface of the scan and not on the entire scan ?
I mean, I would like to superimpose 2 scans only on the nose, is it possible to do that ?

Thank you in advance,

[daniel]

Yes. You can clone the mesh first (or you'll reload it later). Then segment the nose part with the scissors tool.
Then align the segmented nose with ICP. A 4x4 matrix will be output in the Console. Copy it (CTRL+C).
Select the original mesh (or reload it) and eventually call 'Edit > Apply transformation', and paste the matrix you've copied (CTRL+V).