“…Therefore, an important subproblem is to find sets of (sufficient) convexity conditions for polynomials in Bernstein-Bézier representation. Particular sets of linear convexity conditions have been derived in [6,8,26,31]; sets of nonlinear conditions have been described in [9,38], and methods based on convexity of the control net and subdivision can be found in [15,18,20,21].…”