Good afternoon M. Geuzaine, Thank you for your answer. I have tried with the new version and it works well. With the new version, How are the mesh attributes chosen ? Do it depend of the surface/volume ID, the higher value of the mesh attributes ?
Thank you for your answer, Benoît CURVERS Laser Systems & Solutions of Europe (LASSE) SCREEN Semiconductor Solutions Co. Ltd Taïwan Cell : 0965875974 or 7629511 Email : [email protected]<mailto:[email protected]> De : Christophe Geuzaine <[email protected]> Envoyé : jeudi 31 mai 2018 20:24 À : Benoit CURVERS <[email protected]> Cc : [email protected]; Karim HUET <[email protected]> Objet : Re: [Gmsh] [gmsh] Boolean operation - Fine to coarse mesh On 31 May 2018, at 17:35, Benoit CURVERS <[email protected]<mailto:[email protected]>> wrote: Dear everyone, I’m writing in the connection the option to have a fine to coarse mesh I’m working with the gmsh 3.0.6 For my project, I create several shape with different mesh options on some points. After this creation, I create a box with all the shapes (+ a little box below all the shapes) and then I perform a Boolean operation (BooleanFragments) to merge lines in order to have one interface between two shapes. But when I perform this operation, I lose all the mesh options on the points where there is two interfaces. Use the latest snapshot: this is now handled automatically. And when I mesh this structure, the meshing is not acceptable. So, how could I not lose the information about the mesh on the interface points when I perform this Boolean operation ? Is there another option to create one interface between to shape without lose the mesh information ? At the end, I would like to have a part with a fine mesh (the volume 1) and for the other part, I would like to have a fine to coarse mesh. And, I would like to know : is it possible to perform a “Refine by splitting” on a single part and not for all the structure ? No Christophe Below, you can find the .geo file with the Boolean operation problem : ---------------------------------------------------------------------------------------------- SetFactory("OpenCASCADE"); // Mesh.CharacteristicLengthMin = 1; // Mesh.CharacteristicLengthMax = 3; p10=newp; Point(p10) = {-10,0,-10, 1}; p11=newp; Point(p11) = {10,0,-10, 1}; p12=newp; Point(p12) = {10,10,-10, 1}; p13=newp; Point(p13) = {-10,10,-10, 1}; l10=newl; Line(l10) = {p10,p11}; l11=newl; Line(l11) = {p11,p12}; l12=newl; Line(l12) = {p12,p13}; l13=newl; Line(l13) = {p13,p10}; ll10 = newll; Line Loop(ll10) = {l10,l11,l12,l13}; rs10 = news ; Plane Surface(rs10) = {ll10}; ex10[]= Extrude{0,0,30}{ Surface{rs10}; }; Physical Volume(1)={ex10[1]}; p20=newp; Point(p20) = {-10,10,-10, 1}; p21=newp; Point(p21) = {10,10,-10, 1}; p22=newp; Point(p22) = {10,30,-10, 1}; p23=newp; Point(p23) = {-10,30,-10, 1}; l20=newl; Line(l20) = {p20,p21}; l21=newl; Line(l21) = {p21,p22}; l22=newl; Line(l22) = {p22,p23}; l23=newl; Line(l23) = {p23,p20}; ll20 = newll; Line Loop(ll20) = {l20,l21,l22,l23}; rs20 = news ; Plane Surface(rs20) = {ll20}; ex20[]= Extrude{0,0,30}{ Surface{rs20}; }; Physical Volume(2)={ex20[1]}; p30=newp; Point(p30) = {-10,30,-10, 1}; p31=newp; Point(p31) = {10,30,-10, 1}; p32=newp; Point(p32) = {10,210,-10, 50}; p33=newp; Point(p33) = {-10,210,-10, 50}; l30=newl; Line(l30) = {p30,p31}; l31=newl; Line(l31) = {p31,p32}; l32=newl; Line(l32) = {p32,p33}; l33=newl; Line(l33) = {p33,p30}; ll30 = newll; Line Loop(ll30) = {l30,l31,l32,l33}; rs30 = news ; Plane Surface(rs30) = {ll30}; ex30[]= Extrude{0,0,30}{ Surface{rs30}; }; Physical Volume(3)={ex30[1]}; vblock=newv; Block(vblock) = {-10,-50,-10, 20,260,30}; v() = BooleanFragments{ Volume{1:3}; Delete; }{ Volume{vblock}; Delete; }; Physical Volume(0)={4}; ---------------------------------------------------------------------------------------------- (The Mesh.CharacteristicLengthMin and Mesh.CharacteristicLengthMax are commented out. If I activate this command, my mesh is refined in all the region and I do not want to obtain this results.) Thank you very much for your answer, Best Regards, Benoît CURVERS Laser Systems & Solutions of Europe (LASSE) SCREEN Semiconductor Solutions Co. Ltd Taïwan Cell : 0965875974 or 7629511 Email : [email protected]<mailto:[email protected]> _______________________________________________ gmsh mailing list [email protected]<mailto:[email protected]> http://onelab.info/mailman/listinfo/gmsh — Prof. Christophe Geuzaine University of Liege, Electrical Engineering and Computer Science http://www.montefiore.ulg.ac.be/~geuzaine Free software: http://gmsh.info | http://getdp.info | http://onelab.info
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