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Which tetrahedral mesh generator recommend you to study finite element method?

I tried to use TetGen. It works well but I can not install tetview to see the meshes because I have a 64bit computer.

I'm need to work with P2 elements in each tetrahedrom.

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The most well-known alternative for TetGen is Netgen. Another approach would be to use another software, e.g. Geomview, to visualize the meshes generated by TetGen.

The usage of $\mathbb{P}_2$-basis doesn't in fact set any additional constraints on the mesher unless you're interested in curved boundary elements which are supported at least by Netgen.

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