# [Gmsh] Coherence 'could not find extruded vertex' error

Bart Deschoolmeester bart.deschoolmeester at bbri.be
Mon Aug 17 16:49:06 CEST 2020

```Thank you again Jeremy,
You’re solution (see below as I understand it) works.
Yet, I have no clue why yours does and mine doesn’t.

Bart.
----
KanR = DefineNumber[ 0.1, Name "Parameters/KanR" ];
WanD = DefineNumber[ 0.2, Name "Parameters/WanD" ];
KanMeshsize = DefineNumber[ 0.01, Name "Parameters/KanMeshsize" ];
Rectangle(1) = {-2.5, -2.5, 0, 5, 5, 0};
Circle(5) = {0, 0, 0, KanR, 0, 2*Pi};
Curve Loop(2) = {5};
Plane Surface(2) = {2};
BooleanDifference{ Surface{1}; Delete; }{ Surface{2}; Delete; }
Extrude {0, 0, WanD } {
Surface{1};
}

Point(15) = {0.05, 0, 0};
Point(16) = {0.05, 0, WanD};
Line(20) = {5, 15};
Line(21) = {15, 16};
Line(22) = {16, 14};
Curve Loop(8) = {21, 22, -18, 20};
Plane Surface(8) = {8};

Extrude {{0, 0, 1}, {0, 0, 0}, Pi} {
Surface{8}; Layers{25};
}

Field[1] = Distance;
Field[1].EdgesList = {5};
Field[1].NNodesByEdge = 50;
Field[2] = Threshold;
Field[2].DistMax = 2.5;
Field[2].DistMin = 0;
Field[2].IField = 1;
Field[2].LcMax = 0.25;
Field[2].LcMin = KanMeshsize ;

Background Field = 2;

Mesh.CharacteristicLengthExtendFromBoundary = 0;
Mesh.CharacteristicLengthFromPoints = 0;
Mesh.CharacteristicLengthFromCurvature = 0;
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```