Contents Preface 7 1 Introduction 9 2 Animating Anisotropic Elastic Materials 19 3 Drawing for Illustration and Annotation in 3D 51 4 Relief: A Modeling by Drawing Tool 85 5 Conclusion and Future Work 105 A What is Ergonomics? 107 B Bzier Curves and Surfaces 109 Bibliography 111 Preface From Molecular Biology to Computer Graphics Before stepping into the subject of this thesis, I would like to talk a little bit about its ontogenesis, or in other terms, the circumstances of its development. Above all, I would like to explain what motivated the quite bold curricula move of mine from molecular biology to computer graphics. When I graduated in 1997, I realized that my interest in biology, initially motivated by the pleasure found in the contemplation of living things, had been seriously challenged by years of manipulating test tubes filled with transparent liquids. I had to find something else to do. By an incredible stroke of luck, at the same moment I was looking for a research labor

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