square_to_sphere

de_ebsd.core.square_to_sphere(xy, eps=1e-12)

Square Lambert coordinates (…, 2, book units) to unit vectors (…, 3).

Inverse of sphere_to_square() for the northern hemisphere (z >= 0); negate z for the southern hemisphere. Port of EMsoft Lambert2DSquareForwardDouble (Rosca 2010, eqs. 8-9).