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<p>I have been testing with the demo file cube.geo:</p>
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<p>lc = 0.3;<br>
Point(1) = {0.0,0.0,0.0,lc};<br>
Point(2) = {1,0.0,0.0,lc};<br>
Point(3) = {1,1,0.0,lc};<br>
Point(4) = {0,1,0.0,lc};<br>
Line(1) = {4,3};<br>
Line(2) = {3,2};<br>
Line(3) = {2,1};<br>
Line(4) = {1,4};<br>
Line Loop(5) = {2,3,4,1};<br>
Plane Surface(6) = {5};<br>
tmp[] = Extrude {0,0.0,1} {<br>
Surface{6};<br>
};<br>
Physical Volume(1) = tmp[1];</p>
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<p>I generate the mesh file at the command line like this:</p>
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<p>gmsh -3 cube.geo</p>
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<p>on a Windows 7 machine and on Ubuntu 16.04. The gmsh version is 4.3.0.</p>
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<p>I find that the meshes created on the two systems are a bit different. On Windows the mesh has 137 nodes and 372 elements, while on Ubuntu it has 136 nodes and 373 elements.</p>
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<p>Should I be concerned about this?</p>
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<p>Thanks</p>
<p>Gib<br>
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