<div>Hello,</div>
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<div>I am using GMSH 2.0.8 on Windows XP. GMSH failed to generate 2nd order elements with a simple 2D polygon, while using GMSH 1.6 was successful. Has anyone ecountered a similar problem on other platforms? What is the work around?
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<div>I list the geo file and the error message below.</div>
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<div>Kevin</div>
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<div>// Gmsh project created on Tue Oct 30 14:59:54 2007<br>Point(1) = {0.065,0.126,0,0.1};<br>Point(2) = {0.093,0.35,0,0.1};<br>Point(3) = {-0.029,0.063,0,0.1};<br>Point(4) = {-0.061,0.061,0,0.1};<br>Point(5) = {-0.07,0.043
,0,0.1};<br>Point(6) = {-0.05,0.018,0,0.1};<br>Point(7) = {-0.047,0.044,0,0.1};<br>Line(1) = {3,4};<br>Line(2) = {4,5};<br>Line(3) = {5,6};<br>Line(4) = {6,7};<br>Line(5) = {7,3};<br>Line Loop(6) = {2,3,4,5,1};<br>Plane Surface(7) = {6};
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<div>Error message</div>
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<div>Warning : Triangle 578 (15 1 5) has negative Jacobian<br>Warning : Triangle 582 (0 170 10) has negative Jacobian<br>Warning : Triangle 585 (176 22 19) has negative Jacobian<br>Warning : Triangle 595 (180 13 6) has negative Jacobian
<br>Warning : Triangle 618 (8 13 188) has negative Jacobian<br>Warning : Triangle 625 (190 23 11) has negative Jacobian<br>Error : Some triangles have negative Jacobians in surface 7<br>====================================================
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