[Gmsh] Avoid exporting spline nodes

[Mikhail Artemiev]

Hi, Marco.
Try to use physical entities for your purposes.

Example:

cl = 1e+22;
Point(1) = {0, 0, 0, cl};
Point(2) = {0, 1, 0, cl};
Point(3) = {2, 2, 0, cl};
Point(4) = {2, 1, 0, cl};
Point(5) = {1, 0, 0, cl};
Line(1) = {1, 2};
Line(2) = {5, 1};
Spline(3) = {2, 3, 4, 5};
Line Loop(4) = {1, 3, 2};
Plane Surface(1) = {4};
Physical Surface(100) = {1};

It works for me. Mesh file doesn't include unusable spline nodes.

Mikhail Artemiev
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