# [Gmsh] Problem in transformation of surfaces list

Ruth Vazquez Sabariego ruth.sabariego at kuleuven.be
Fri Oct 20 12:01:30 CEST 2017

```Hi Alessandro,

The problem is the order of the operations.
You do a rotation of surfaces that define volume 1.
That’s why they are kept.

The rotation is properly handled if you write it as follows:

tmp[] = Physical Surface {102,103};
Rotate {{1, 0, 0}, {-0.5, 0.65, -0.25}, Pi/6} {
Surface {tmp[]};
}

Surface Loop(5) = {28, 23, 25, 27, 26, 24};
Surface Loop(6) = {9, 4, 6, 8, 7, 10, 1, 22, 18, 21, 20, 17, 19};
Surface Loop(7) = {15, 11, 13, 12, 16, 14};
Volume(1) = {5, 6, 7};
Physical Volume(999) = {1};

Best regards,
Ruth

—
Prof. Ruth V. Sabariego
KU Leuven
Dept. Electrical Engineering ESAT/Electa, EnergyVille
http://www.esat.kuleuven.be/electa
http://www.energyville.be

Free software: http://gmsh.info | http://getdp.info | http://onelab.info

On 20 Oct 2017, at 10:46, Alessandro Vicini <alessandro.vicini at sitael.com<mailto:alessandro.vicini at sitael.com>> wrote:

Hullo everybody. In the last two lines of the attached geo file I retrieve the list of elementary surfaces ID from their physical IDs, and then apply a rotation to the list. However, only the edges are rotated, and the "old" surfaces and edges are not deleted after the operation. Why...? Thank you.

Alessandro

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