[Gmsh] import STL object then Boolean subtract

[Christophe Geuzaine]

> On 21 Aug 2019, at 20:47, Junting Chen <chen112p at uwindsor.ca> wrote:
> 
> Hello, I have read this topic being discussed:
> 
> http://onelab.info/pipermail/gmsh/2019/012729.html 
> 
> One of the comments you left was that user can merge the STL using built-in and then switch to Opencascade, as long as one doesn't use boolean operation afterward.
> 

That won't work: the boolean operations are only available on the CAD data, not the STL (discrete mesh) data...

Christophe

> However I do need to use the boolean operation to subtract the imported object (3D). Is it some other tricks to overcome this issue?
> 
> Also, this imported object has a section above ground level and a concave section below ground level. Would you mind to give me some guidance on meshing this stuff? I dont think it is going to be a straight forward BooleanDifference. I have attached a schematic to illustrate my case. Thanks!
> 
>  Junting Chen
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— 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 
http://www.montefiore.ulg.ac.be/~geuzaine