Heterogeneous Object Design with Material Feature Blending

Abstract

Ribbons may be used for the modeling of DNAs and proteins.The topology of a ribbon can be described by the link Lk, while its geometry is represented by the writhe Wr and the twist Tw.These three quantities are numerical integrals and are related by a single formula from knot theory.This article discusses the meanings of these three quantities, offers an approach for calculating their numerical values, and provides some examples.