[Gmsh] Error : Self intersecting surface mesh, computing intersections (this could take a while)

[Roman Fratczak]

Hello,

It is possible, that you will get your geometry in other format?
In your "ply" there is already a surface mesh given. Try maybe use STEP, 
IGES,...  as input- then it is easer to recalculate the surface mesh.

In case of need of usage of "a dead mesh" - maybe try first to remesh it 
(i.e. in blender with modification Remesh) and/or clean it (removing 
double vertexes and edges).

regards
Roman




W dniu 11.03.2014 12:13, Steffen Becker pisze:
> Hi,
>
> in the appendix you find my model.
> Thanks for  help!!
>
> Regards,
> Steffen
>
> Am 11.03.2014 11:47, schrieb Roman Fratczak:
>> Hello Steffen,
>>
>> Yes. You can try to the first Optimize quality of tetra, or all of 
>> them (just try).
>>
>> I don't know how your model looks like. If the elements on the 
>> surface are too big, then the solid elements (probably tetragonal) 
>> may be with intersecting edges or faces. Therefore the reducing size 
>> of element may help (especially on the surfaces).
>>
>> Or- just share your model (ply) -in order to be more precise.
>>
>> regards
>> Roman
>>
>>
>>
>> W dniu 10.03.2014 18:06, Steffen Becker pisze:
>>> Hi Roman,
>>> when you say "enable option: optimize", you mean" Tools -> Options 
>>> -> Mesh -> Advanced -> Optimize quality of tetrahedra, Optimize 
>>> quality of tetrahedra with Netgen, Optimize high order meshes 
>>> (experimental)" ?
>>> And why is reducing element size important? In my case it is 
>>> important that the object has such "90 degree corners".
>>>
>>> Regards,
>>> Steffen
>>>
>>> Am 10.03.2014 16:55, schrieb Roman Fratczak:
>>>> Hi Steffen,
>>>>
>>>> If your volume is OK (is really a closed one) - try to:
>>>>
>>>> 1. Reduce element size (especially in a curved shapes)
>>>> 2. Enable option "Optimize" - in mesh options
>>>>
>>>> Regards
>>>> Roman
>>>>
>>>>
>>>>
>>>> W dniu 10.03.2014 16:41, Steffen Becker pisze:
>>>>> Hello everyone,
>>>>>
>>>>> I'm a gmsh beginner and I want to create a 3D volume mesh out of a 
>>>>> given surface-mesh but I got the error message as seen in the 
>>>>> subject. You find my .geo file in the appendix.
>>>>> Can anyone tell me what I have to do to create a 3D mesh? I even 
>>>>> can't figure out where the intersection are located (don't know 
>>>>> how to read the intersect.pos).
>>>>> Sorry for my poor english.
>>>>>
>>>>> Regards,
>>>>> Steffen
>>>>>
>>>>>
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>>>>
>>>>
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>

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