Hi Caen,

Converting a .stl -> .step for use of FEA analysis is a really perverse idea ;)
low order geometry -> higher order geometry -> lower order geometry is just 
increasing the pain / complexity rather than reducing it.
Also; in CAD a few nurbs patches can easily take up thousands of triangles to 
be described accurately!

What you should look into is re-meshing your STL file into something that your 
solver can grok.
There are pre-processors ( patran ) that will do this for you.

-jelle

> Hi Thiago & Thomas,
> 
> Thanks for your replies.
> 
> Acturally I got that 'my.iges' file. The STL file I opened is located 
> differently from the folder where I run CADViewer.  
> iges_writer.Write("my.iges") wrote the 'my.iges' file in that STL file 
> folder. But when I opened this 'my.iges' file, it looks the same as a STL 
> file and can't make a mesh on it.
> 
> Follow the same logical, I tried to export a STEP file. It looks like a solid 
> one and can be meshed. Quite excited to get a FEA result. 
> 
> The only problem now is that STEP file also keep the lines of the surface 
> triangle. The FEA mesh doesn't look good. 
> 
> Don't know how could I remove the surface lines from the STEP file.
> 
> Regards,
> 
> Cean 


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