Hello Nicu,
The same problem on my computer. I guess it comes from a tolerance
problem with the boolean operators.
Adding this to your code :
Geometry.ToleranceBoolean = 0.001;
makes it work again.
(however, I'm not sure if it's the right way to deal with it, maybe
someone else will confirm (/ou pas/) ?)
Bert
On 05/30/2018 12:08 PM, Nicolae Cindea wrote:
Dear all,
I think there is an issue concerning the difference (or the
intersection) of two volumes. The following code:
// here starts the code
SetFactory("OpenCASCADE");
L = 0.5; // cylinder length [0, L]
l = 1.00; // triangle edge
r = 0.050; // radius of the sphere
h = l * Sqrt(3) / 2;
Sphere(2) = { 0, 0, 0, r };
Point(101) = { h / 3, 0, -l / 2 };
Point(102) = { h / 3, 0, l / 2 };
Point(103) = { -2 * h / 3, 0, 0 };
Line(201) = { 102, 103 };
Line(202) = { 103, 101 };
Line(203) = { 101, 102 };
Line Loop(204) = {201, 202, 203};
Surface(3) = { 204 };
Translate { -0.108320, 0, -0.062538 } { Surface{3};}
out[] = Extrude { 0, L, 0 }{ Surface{3}; };
BooleanDifference(8) = { Volume{3}; Delete; }{ Volume{2}; Delete; };
// here ends the code
gives the following error "Error : Intersection operation cannot be
performed". Nevertheless, replacing the line
Translate { -0.108320, 0, -0.062538 } { Surface{3};}
by
Translate { -0.108320, 0, -0.062537 } { Surface{3};}
the error message disappears and everything work as supposed.
Can somebody reproduce this comportment? Since the above .geo file is
generated from another language I'm searching a workaround to avoid
the problematic situations.
Thank you.
Regards,
Nicolae.
PS: my gmsh -info
Version : 3.0.6
License : GNU General Public License
Build OS : Linux64
Build date : 20171105
Build host : gmsh.info
Build options : 64Bit Ann Bamg Bfgs Blas(Generic) Blossom C++11
Chaco DIntegration Dlopen Fltk Gmm Jpeg(Fltk) Kbipack Lapack(Generic)
LinuxJoystick MathEx Med Mesh Metis Mmg3d Mpeg Netgen ONELAB
ONELABMetamodel OpenCASCADE OpenGL OptHom PETSc Parser Plugins
Png(Fltk) Post SLEPc Solver Taucs TetGen/BR Tetgen1.5 Voro3D Zlib
FLTK version : 1.3.4
PETSc version : 3.7.5 (complex arithmtic)
OCC version : 7.1.0
MED version : 3.2.0
Packaged by : gitlab-runner
Web site : http://gmsh.info
Mailing list : gmsh@onelab.info
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Bertrand THIERRY
CNRS researcher (Chargé de Recherche)
Laboratoire Jacques-Louis Lions
Sorbonne Université
Office 310, Corridor 15/25
Tel: +33 (0)1 44 27 72 01
https://www.ljll.math.upmc.fr/bthierry
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