Hello all, this might be answered previously but i wasn't really able to
find a good solution yet.

I have created a bounding box and extracted my target geometry out by the
boolean operation. The next step I want to do is to force the two side
planes having the same mesh. I think I should use the periodic command but
i can never make it work properly.

Periodic Line{5} = {21} ;
Periodic Line{1} = {3} ;
Periodic Line{7} = {24} ;
Periodic Line{6} = {23} ;
Periodic Surface {5}= {6};

I kept on getting error message like "Affine transformation requires at
least 12 entries".

I have attached my .geo file as well as the step file if anyone doesn't
mind to do a brief run.

Thanks a lot for your help!

Junting Chen

Attachment: concaveTower.geo
Description: Binary data

Attachment: concaveTower.stp
Description: Binary data

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