Geometry control of the junction between two fractal curves

作     者：Podkorytov, Sergey Gentil, Christian Sokolov, Dmitry Lanquetin, Sandrine 

作者机构：Univ Burgundy Dijon France Univ Lorraine Metz France 

出 版 物：《COMPUTER-AIDED DESIGN》 (计算机辅助设计)

年 卷 期：2013年第45卷第2期

页      面：424-431页

核心收录：

学科分类：08[工学] 0835[工学-软件工程] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

主　　题：Iterative Function System Attractor Curve Differentiability 

摘      要：The general objective of our work is to create a geometric modeller based on iterative processes. With this objective in mind, we have to provide tools that work with fractal objects in the same manner as with objects of classical topology. In this article we focus on the constructing of an intermediate curve between two other curves defined by different iterative construction processes. A similar problem often arises with subdivision surfaces, when the goal is to connect two surfaces with different subdivision masks. We start by dealing with curves, willing to later generalise our approach to surfaces. We formalise the problem with the Boundary Controlled Iterated Function System model. Then we deduct the conditions that guarantees continuity of the intermediate curve. These conditions determine the structure of subdivision matrices. By studying the eigenvalues of the subdivision operators, we characterise the differential behaviour at the connection points between the curves and the intermediate one. This behaviour depends on the nature of the initial curves and coefficients of the subdivision matrices. We also suggest a method to control the differential behaviour by adding intermediate control points. (c) 2012 Elsevier Ltd. All rights reserved.