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I don’t know what FEM method RFEM uses, but many methods use elements which are already interpolatory and so the point values of the solution vector are the approximate solution at that point, as you note. What you do to make a picture at in between points is up to you. Some vis packages may be able to resample on your element type to get more accurate ...


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I am guessing that RFEM uses Euler- Bernoulli beam theory. In that case, you need elements that have continuous derivatives. This is achieved using Hermite interpolation where you end up with cubic polynomials.


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