Quasi-Harmonic Constraints for Toric Bézier Surfaces
Toric Bézier patches generalize the classical tensor-product triangular and rectangular Bézier surfaces, extensively used in $CAGD$. The construction of toric Bézier surfaces corresponding to multi-sided convex hulls for known boundary mass-points with integer coordinates (in particular for trapezoidal and hexagonal convex hulls) is given. For these toric Bézier surfaces, we find approximate minimal surfaces obtained by extremizing the quasi-harmonic energy functional. We call these approximate minimal surfaces as the quasi-harmonic toric Bézier surfaces. This is achieved by imposing the vanishing condition of gradient of the quasi-harmonic functional and obtaining a set of linear constraints on the unknown inner mass-points of the toric Bézier patch for the above mentioned convex hull domains, under which they are quasi-harmonic toric Bézier patches. This gives us the solution of the \textit{Plateau toric Bézier problem} for these illustrative instances for known convex hull domains.