[Gmsh] Mesh Element size

[bpigeard at free.fr]

Hello I still investigate the possibility to translate GDSII file into Geo
Format to get a mesh of the GDSII.

I'm facing an error regarding mesh element size.
I did an algorithm to set element size base on neighbor's size (I use Voronoï to
find neighbors). But I get a strange error which append on linux release only (I
just check with 2.16.0 as 3.0.1 and 3.0.0 crash at the end).

So You will find a test case attach with the main file Error.geo which include 2
Metal3 file.
They both have the same geometry but translated.
The left part work properly, the right part failed to mesh.
If we slightly change the element size of file "M3_Error.geo" line 1129
Pt_i = 74241; Pt_x = 1160.375000; Pt_y = 1353.220000; Pt_z = 294.380000; Pt_cl =
0.580000*cl26;
to
Pt_cl = 0.580500*cl26;
or to Pt_cl = 0.579500*cl26;

Then it works !!!!

So I have to modify the file manually to make it works as it's not a consistant
error.

If you can help me to solve this error that would be very help full.

Great job for the last release,

Bertrand

Selon Bertrand PIGEARD <bpigeard at gmail.com>:

> Hello Micheal,
>
> you can find a not snapshot at: https://github.com/trilomix/GDS3D
> This repository is not uptodate right know but working for already merge
> flat gds.
> This snap shot allow also to include more than one gds (Multi-chip).
> I also implement a flat and merge with the help of the Clipper library.
> I'll publish this lately.
>
> I still face problems with element size to get a mesh with no error.
>
> Regards,
> Bertrand
>
> 2017-03-14 23:37 GMT+09:00 <michael.asam at infineon.com>:
>
> > Bonjour Bertrand,
> >
> >
> >
> > converting a GDS file to a Gmsh geo file would also be very, very helpful
> > for me.
> >
> > Therefore I’m quite interested in your project. I see that GDS3D is open
> > source.
> >
> > Do you also intend to make your software open source or publicly available.
> >
> > If so, I would highly appreciate to use it.
> >
> >
> >
> > Many thanks in advance for your answer!
> >
> >
> >
> > Cheers,
> >
> > Michael
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > *From:* gmsh [mailto:gmsh-bounces at ace20.montefiore.ulg.ac.be] *On Behalf
> > Of *Bertrand PIGEARD
> > *Sent:* Wednesday, January 11, 2017 6:20 AM
> > *To:* gmsh at onelab.info
> > *Subject:* [Gmsh] Mesh Element size
> >
> >
> >
> > Bonjour,
> >
> > I'm working on a project to translate GSDII file (2D format for microchip)
> > to a 3D geo format, we just had the thickness of layers. (Work base on
> > GDS3D http://sourceforge.net/projects/gds3d/ )
> >
> >
> >
> > The full geometry is ok but we face issue with mesh. So we control the
> > mesh size of each point regarding the polygone areaand the mesh around the
> > point.
> >
> > We tried to find rules to get the mesh with no error but we still have
> > error with edge.
> >
> > So can you give us some rules to follow to get the mesh working.
> >
> >
> >
> > I can provide a geo test file but it's big even while zip (>10M)
> >
> >
> >
> > Thanks for your work and Happy new year,
> >
> >
> >
> > Bertrand
> >
> >
> >
> > PS: I also open a bug related to 2D mesh. The meshGFace random (line 1120
> > and 1122) lead to error if the random function get twice the same value.
> >
>


-------------- next part --------------
A non-text attachment was scrubbed...
Name: Error.geo
Type: application/octet-stream
Size: 875 bytes
Desc: not available
URL: <http://onelab.info/pipermail/gmsh/attachments/20170426/3f74d194/attachment-0004.geo>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Init.geo
Type: application/octet-stream
Size: 293 bytes
Desc: not available
URL: <http://onelab.info/pipermail/gmsh/attachments/20170426/3f74d194/attachment-0005.geo>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: M3_Left.geo
Type: application/octet-stream
Size: 54155 bytes
Desc: not available
URL: <http://onelab.info/pipermail/gmsh/attachments/20170426/3f74d194/attachment-0006.geo>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: M3_Error.geo
Type: application/octet-stream
Size: 55506 bytes
Desc: not available
URL: <http://onelab.info/pipermail/gmsh/attachments/20170426/3f74d194/attachment-0007.geo>