Hi @Chavdar,
In Fields Calculator, we use Lagrange basis functions for interpolation, with barycentric coordinates for tetrahedral and triangle elements. To calculate the value of any expression at a point, we first find the barycentric coordinates for that point and then perform the evaluation. From Maxwell solvers, most field quantities are represented in 2nd order polynomial over the elements. In Fields Calculator, if further operations are involved, the order of the expression might be higher.
GLUO
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