mesh to surface, how to do?

[Norus]

Hello again,

working with bones and implants the question appears: how to get a surface (FreeCAD understands) from a stl-file.

The file comes from meshmixer.

thanks a lot

[chrisb]

This has very often been discussed: Part->ShapeFromMesh.

[drmacro]

This has very often been discussed: Part->ShapeFromMesh.

It doesn't produce any thing...it does create a feature in the tree, but nothing displays and error:

Code: Select all

<Part> ViewProviderExt.cpp(1324): Cannot compute Inventor representation for the shape of grid_to_surface#H__lle_aussen002001

OS: Ubuntu 19.10 (XFCE/ubuntustudio)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.
Build type: Release
Branch: unknown
Hash: 2c56e3c9faec3accf134a2940d809dd44bcfbb3a
Python version: 3.7.5
Qt version: 5.12.4
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: English/United States (en_US)

[Norus]

I am using the german version the function is: part_WB -> Formteil -> Form aus Dreiecksnetz erstellen. For me this is "shape from mesh".

But no effect, even a new part in the tree without any geometrie.

It works if a solid, from meshmixer for example, is used, not in case of a shape.

[fc_tofu]

working with bones and implants the question appears: how to get a surface (FreeCAD understands) from a stl-file.

It seems your intent is to convert faceted mesh into curved surface (NURBS). Right?
But this is not design intent of "Mesh to surface".

"Mesh to surface" is design to handle very simple mesh model.

What you need is "Reverse Engineering"(RE) tool.

FreeCAD has 2 RE workbench, but both limited abilities.
1. stock installed, Reverse Engineer workbench.
2. from Addon Manager, Mesh Remodel. (or something like that).

[Quaoar]

After playing with Instant Meshes and Coons surfaces in Analysis Situs:

http://quaoar.su/files/cases/autosurf01.stp
http://quaoar.su/files/cases/autosurf02.stp

[chrisb]

It doesn't produce any thing...it does create a feature in the tree, but nothing displays and error:

Works flawless here (tolerance 0.1), file is too big to attach, even without the FEM result:

Snip macro screenshot-2793f9.png (175.68 KiB) Viewed 2594 times

OS: macOS High Sierra (10.13)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.21671 (Git)
Build type: Release
Branch: master
Hash: f05253f882b336f56aae32593faa5676fd5aafdd
Python version: 3.8.2
Qt version: 5.12.5
Coin version: 4.0.0
OCC version: 7.4.0
Locale: C/Default (C)

[Quaoar]

Single surface:

[Norus]

It works in FreeCAD 0.19

Thank`s

[drmacro]

It doesn't produce any thing...it does create a feature in the tree, but nothing displays and error:

Works flawless here (tolerance 0.1), file is too big to attach, even without the FEM result:

Nope:

ShapeFromMesh.png (235.83 KiB) Viewed 2556 times

No display, but the file is 13Mb after executing Create shape from mesh...

Update: and if I load the file where it has worked from this thread: https://forum.freecadweb.org/viewtopic.php?f=3&t=48186
It gets the same error when the file is loaded and nothing displayed...

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?

OS: Ubuntu 19.10 (XFCE/ubuntustudio)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.
Build type: Release
Branch: unknown
Hash: 2c56e3c9faec3accf134a2940d809dd44bcfbb3a
Python version: 3.7.5
Qt version: 5.12.4
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: English/United States (en_US)