[Gmsh] igs to geo

[Fabian]

Christophe Geuzaine wrote:
> Fabian Braennstroem wrote:
>    
>> Hi Christophe,
>>
>> * On 20 Jul 2008 * Christophe Geuzaine wrote:
>>
>>      
>>> Fabian Braennstroem wrote:
>>>        
>>>> Hi,
>>>>
>>>>      I have a small problem, when importing an igs (exported by
>>>>              ICEM) geometry. Actually the import works well,
>>>>      but as soon as I save it as a geo file, I get a lot more
>>>>      points then in the igs file. I attach to snapshots. Do I
>>>>      do anything wrong?
>>>>          
>>> Not really: the geo export is pretty much there for debugging purposes
>>> only. The reason you get more points is probably that the straight lines
>>> in the iges files are represented e.g. by splines instead of line
>>> segments.
>>>
>>> Our goal is to mesh iges/step files directly, without converting them
>>> into geo format first...
>>>        
>> Did not know that; sounds nice.
>>
>>      
>>>>      The view is an extraction of a simple diffuser, which I
>>>>      want to mesh with hexa elements.
>>>>
>>>>          
>>> ...but indeed, for this you would have to convert the iges file into geo
>>> format, since we haven't (yet) interfaced the structured meshing commands
>>> with general CAD files.
>>>        
>> Sounds even better.
>>
>>      
>>> Why is having more control points a problem?
>>>        
>> It is actually not a problem, but the geo file gets
>> completely messy and I am not able to do the definition of
>> the mesh by hand!?
>>      
>
> to generate hexas with Gmsh you'll currently need to define either
> transfinite volumes (cf. demos/transfinite.geo) or use extrusion (sweeping).
>
>    
Forgot to say: thanks!
Fabian