Robustify cart2sph() function#24
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The hack for preventing division-by-zero where a lattice grid includes a point at the origin involves translating the whole lattice. Preserving vertex positions ensures that the field retains its expected symmetry to machine precision.
hypot()functions are preferable to squaring & square-rooting for preservation of floating-point precision, particularly avoiding exceeding bounds of trig functions.Scaling of inputs to
arctan2()have no effect.