Split&Tweak subdivisions iteratively refine a polygon by inserting a vertex in the middle of each edge (Split) and then moving each vertex to an affine combination of five consecutive vertices (Tweak). Special cases include Dyn, Gregory, and Levin’s fourpoint subdivision, Lane and Riesenfeld’s cubic and quintic B-spline subdivision, Rossignac’s subdivision which produces C curves, and Maillot a...
