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Is it possible to create a rough surface in FEKO?

Hello,

I'm trying to create a rough surface geometry in FEKO. Other posts state that this is not possible, but I tried it anyway with the following procedure:

1. Create the rough surface with the desired statistical properties in MATLAB (as an [x,y,z] surface plot).
2. Use the DXFLib to create a polysurface and export it to a .dxf file.
3. Import the .dxf file to the FEKO geometry.

However, when I try to import the geometry to FEKO I get the following error message:

Is this a feasible way to create a rough surface? If it is, could it be a problem with the .dxf file version?

Any insights would be appreciated. Thanks.

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Torben Voigt

Hi @Carlos Viteri ,

.dxf is in general supported, so I wonder what could be the reason here.. The new CADFEKO has been released some months ago (alongside with the the old GUI), so I wonder if there have been some file formats not being supported in the first releases.

What version of Feko are you using?

Would it be possible to attach the .dxf here?

Best regards,
Torben

Carlos Viteri

Hi @Carlos Viteri ,

.dxf is in general supported, so I wonder what could be the reason here.. The new CADFEKO has been released some months ago (alongside with the the old GUI), so I wonder if there have been some file formats not being supported in the first releases.

What version of Feko are you using?

Would it be possible to attach the .dxf here?

Best regards,
Torben

Hello Torben,

Thanks for your reply.

After your message, I tried to open the .dxf files generated in MATLAB (attached) in the AutoCAD Web App and I got an 'unsupported file type' error. It seems like this is indeed a file format problem.

I'm using FEKO 2022.2, MATLAB 2022b, and DXFLib 0.9.1 (latest version from 2011 - available here).

I've attached 3 examples from the library and a test surface I wanted to import to FEKO.

Do you know any other method to create random surface and import it to FEKO?

Thanks for your help!

Regards,
Carlos

example1_points.dxf

example2_polylines.dxf

example3_polymesh.dxf

test.dxf

Torben Voigt

Hello Torben,

Thanks for your reply.

After your message, I tried to open the .dxf files generated in MATLAB (attached) in the AutoCAD Web App and I got an 'unsupported file type' error. It seems like this is indeed a file format problem.

I'm using FEKO 2022.2, MATLAB 2022b, and DXFLib 0.9.1 (latest version from 2011 - available here).

I've attached 3 examples from the library and a test surface I wanted to import to FEKO.

Do you know any other method to create random surface and import it to FEKO?

Thanks for your help!

Regards,
Carlos

Hi @Carlos Viteri ,

If you can't open the files in AutoCAD web viewer, then something seems to be wrong with the format. Here you would probably have to do some more research.

In principle, it should not matter with which application random surfaces are created. As long as the format is supported, you should be able to import it into Feko. By the way, there are also scripts in Feko that can create random surfaces:

Best regards,
Torben