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<p style="margin-top:0;margin-bottom:0">Hello,</p>
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<p style="margin-top:0;margin-bottom:0">I'm Anthony Gee. I am using gmsh 3.0.6 to generate nodes for high order interpolation. I found some odd behavior when meshing a sphere with cubic and higher 2D elements. I can only observe this from the exported .msh
file with ASCII 2.0. Somehow, one or more of the elements include an internal node that should be in a different element. I've attached a picture of one such element. The blue points are the nodes of one element from the .msh file for a sphere with ~8000 cubic
elements. The orange point is the central node and shows the misplaced node for that element. I have observed this with higher order and more elements but lower order or less elements seems ok.</p>
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<p style="margin-top:0;margin-bottom:0">I'm not sure why this occurs or whether it shows up in other structures. I could not find a fix in the geometry or meshing options. I've attached my .geo and .msh file. For this case, I generated the 2D mesh and only
used refine by splitting command a few times to get 8192 triangles. Please let me know if I made a mistake somewhere. Thank you.</p>
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<p style="margin-top:0;margin-bottom:0">Anthony Gee</p>
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