mesh to surface, how to do?

[Norus]

This is a windows version:

OS: Windows 10 (10.0)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.21775 (Git)
Build type: Release
Branch: master
Hash: 1f741aa511e898849e46ed14515fce416fe32acb
Python version: 3.8.2
Qt version: 5.12.5
Coin version: 4.0.0
OCC version: 7.4.0
Locale: German/Germany (de_DE)

The problem is how to create a volume, with 3D-offset for example.

[Vincent B]

Single surface:

With wish program you made it?

[chrisb]

Update: If I load the original file and set the tolerance to 0.01, instead of 0.1 it works. So why does it work at 0.1 on yours?

I tried on Ubuntu and can confirm your behaviour. But here comes the strange thing: I saved the file and opened it on the Mac: And I can see the Shape!
So It's a display issue, not a mesh issue.

OS: Ubuntu 16.04.6 LTS (Unity/ubuntu)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.
Build type: Release
Branch: unknown
Hash: 76aac3a22189c2b0b0b99ec7a7fb18cd62796d42
Python version: 3.5.2
Qt version: 4.8.7
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: English/UnitedStates (en_US)

[Quaoar]

Single surface:

With wish program you made it?

The one from my signature. Here is how: http://quaoar.su/files/cases/resurf.mp4

[drmacro]

Update: If I load the original file and set the tolerance to 0.01, instead of 0.1 it works. So why does it work at 0.1 on yours?

I tried on Ubuntu and can confirm your behaviour. But here comes the strange thing: I saved the file and opened it on the Mac: And I can see the Shape!
So It's a display issue, not a mesh ...

Yeah, and i confirmed it on same Ubuntu, different PC's, one radeon, one nvidia.

[drmacro]

I think I see what might be causing the issue...but, I guess I don't understand what the graphics driver would have to do with it.

If I use 0.01 to get it to mesh I can see voids in the resulting shape.
If I then look at those areas on the original mesh (circled in red here:

MeshHolesFar_annot.png (84.39 KiB) Viewed 1213 times

And zoomed up here:

MeshHolesClose.png (51.93 KiB) Viewed 1213 times

Similar voids on the left socket as well...

[tanderson69]

The one from my signature. Here is how: http://quaoar.su/files/cases/resurf.mp4

Cool! does that process use GeomPlate_BuildPlateSurface.hxx?

[Vincent B]

Could be a very nice feature for freecad.

[Quaoar]

The one from my signature. Here is how: http://quaoar.su/files/cases/resurf.mp4

Cool! does that process use GeomPlate_BuildPlateSurface.hxx?

Nope, that's a least-squares surface fitting with aggregated smoothing functional. The sources are attached (it's a tiny NURBS evaluation lib based on The NURBS Book, a part of my indie research). For integration with FreeCAD, I guess, it might make sense to rewrite on BSplCLib/BSplSLib, though conversion between Piegl's B-surface and OCCT B-surface is quite trivial.

The code of interest is geom_ApproxBSurf.h/.cpp