“…Although the smoothness of a curve is difficult to be expressed in a quantitative way, the strain energy (also called bending energy) minimization or the curvature variation energy minimization is adopted to construct fair curves in most cases (see e.g. Ahn et al, 2014;Žagar, 2011a, 2011b;Li et al, 2012;Li, 2018;Lu, 2015aLu, , 2015bLu et al, 2017;Xu et al, 2011). Here, we determine the values of the free parameters by minimizing curvature variation energy to obtain the fairest αβ-Hermite curve.…”