[Gmsh] otimize 3D netgen crashes

[Christophe Geuzaine]

Indeed, the Netgen optimizer is quite crash-happy... It's provided as a convenience, as it sometimes produces interesting results; but we don't develop this and we thus recommend using the default optimizer in most cases.

> On 23 Aug 2018, at 18:05, Mark Smith <piedycat at yahoo.com> wrote:
> 
> gmsh 3.06 or 4.0.0
> Dear Gmsh forum,
> 
> I have a geo file which I 3D mesh with tetrahedra, I can optimize the 3D mesh with Optimize 3D but if I use Optimize 3D (Netgen) gmsh crashes with the following error:
> 
> Problem signature:
>   Problem Event Name:    APPCRASH
>   Application Name:    gmsh.exe
>   Application Version:    0.0.0.0
>   Application Timestamp:    aa80aa78
>   Fault Module Name:    gmsh.exe
>   Fault Module Version:    0.0.0.0
>   Fault Module Timestamp:    aa80aa78
>   Exception Code:    c0000005
>   Exception Offset:    00000000009545c0
>   OS Version:    6.1.7601.2.1.0.256.48
>   Locale ID:    2057
>   Additional Information 1:    c684
>   Additional Information 2:    c684f09528fb57884ca928a5bc428f55
>   Additional Information 3:    cf6d
>   Additional Information 4:    cf6d62335bc704516de51f24e907807e
> 
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> 
> Is this a known problem? My 2D mesh looks good but the quality of the 3D mesh is dubious & I was hoping the optimize 3D Netgen might improve the situation?
> Regards
> Mark
> 
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— 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 
http://www.montefiore.ulg.ac.be/~geuzaine

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