DOCTORAATSPROEFSCHRIFT - EDM - UHasselt

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$Reflectance Model for Diffraction - EDM - UHasselt$

ii Acknowledgments express my gratitude toward Peter Vandoren, Ingrid Konings and Roger Claes for taking care of the formalities associated with the successful completion of my PhD. On a more personal note, I would like to thank my family and friends for their support; especially my parents Piet and Elly for giving me every opportunity and supporting my decisions. And finally, I want to thank Elise Willems for all her support, for being there for me and for brightening up my life. Thank you! Diepenbeek, January 2008.
Abstract The field of networked virtual environments has been an active area of research in the past decades. The increasing power of contemporary computers and the lowering of hardware and connectivity costs permits people to have this technology available in their homes and workplaces. As a result, several applications and prototypes are successfully being used in several fields. Most of the research and developments have, however, been technology driven and as a result one of the main components, interaction, is much less explored. In this dissertation we focus on realizing more realistic virtual experiences by narrowing the gap between real-life and virtual world interaction possibilities. In contrast to ad hoc approaches, we also seek to provide a more general and reusable solution. The interactive object approach provides such a solution by employing a general purpose interaction mechanism for every kind of interaction in the virtual world. This mechanism relies heavily on a feature modeling approach that allows objects to describe their own interaction possibilities. As a result, the interactions become application independent and objects unknown to the application can be inserted at run time. The problem of realistic interactions is, however, not limited to representation and execution of interactions. It requires the consideration of several related fields, such as realistic simulation and animation, user embodiment and human computer interaction as well. Therefore, in a second phase, we developed and integrated the ExtReAM library into the interaction framework. This platform-independent library allows us to improve realism by enabling physical simulation and more dynamic animations for objects and user embodiments. Furthermore, it allows objects to contain physical properties and actions as well. By combining realistic simulation with our dynamic interac-
Page 1: DOCTORAATSPROEFSCHRIFT 2008 | Schoo
Page 5: Acknowledgments A researcher’s wo
Page 9 and 10: Contents Acknowledgments i Abstract
Page 11 and 12: CONTENTS vii 8.1.2 Inverse Kinemati
Page 13 and 14: AI Artificial Intelligent AOI Area
Page 15 and 16: List of Figures 1.1 The different s
Page 17 and 18: LIST OF FIGURES xiii 10.1 Illustrat
Page 19 and 20: General Introduction The idea of cr
Page 21 and 22: Problem Statement One way of explai
Page 23 and 24: Contributions The overall purpose o
Page 25 and 26: Although the field we are working i
Page 27 and 28: This dissertation comprises five pa
Page 29: Part I BACKGROUND
Page 32 and 33: 14 TABLE OF CONTENTS
Page 34 and 35: 16 Defining Interactive Virtual Rea
Page 46 and 47: 28 A Brief Historical Overview Figu
Page 48 and 49: 30 A Brief Historical Overview comm
Page 50 and 51: 32 A Brief Historical Overview Figu
Page 52 and 53: 34 A Brief Historical Overview 2.2
Page 54 and 55: 36 A Brief Historical Overview (a)
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Table of Contents 3 Introduction 41
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CHAPTER3 Introduction In the genera
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Another interesting point, in the c
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CHAPTER4 Related Work While modelin
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proach, interactive surfaces descri
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CHAPTER5 A Dynamic Interactive Obje
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5.2 Interactive Objects and Dynamic
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5.3 The Interaction Layer 57 Listin
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5.3 The Interaction Layer 59 Task 3
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5.3 The Interaction Layer 61 Figure
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5.4 Network Distribution and Simula
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5.5 Evaluation of the Interactive O
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CHAPTER6 Conclusions In this part,
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Part III CREATING MORE REALISTIC DY
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76 TABLE OF CONTENTS
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78 Introduction to recent advances
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80 Introduction
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82 Related Work Figure 8.1: A model
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84 Related Work Figure 8.3: Illustr
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86 Related Work Figure 8.4: Ragdoll
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88 Related Work
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90 The ExtReAM Library: Extensible
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102 A Physically Simulated Dynamic
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110 Conclusions application develop
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Table of Contents 12 Introduction 1
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CHAPTER12 Introduction In the first
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117 effector of the IK chain of an
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CHAPTER13 Related Work In order to
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121 the rendering of rather static
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123 temperature and galvanic skin r
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CHAPTER14 An Avatar Control Method
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14.2 A Direct Avatar Controller Exp
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14.3 Distributing Animation Informa
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14.4 Results 131 frame, resulting i
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14.4 Results 133 Figure 14.3: Resul
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CHAPTER15 A Physical Travel Method
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15.1 Creating A Haptic Controller b
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15.2 Enabling Physical Travel 139 W
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15.2 Enabling Physical Travel 141 t
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15.2 Enabling Physical Travel 143 r
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CHAPTER16 Evaluating the Effects of
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16.1 The Haptic Travel Experiment 1
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16.1 The Haptic Travel Experiment 1
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16.2 Experimental Results 151 (a) (
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16.2 Experimental Results 153 pare
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16.2 Experimental Results 155 Figur
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CHAPTER17 Conclusions In contrast t
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Part V CONCLUSIONS AND FUTURE RESEA
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162 General Conclusions concepts of
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164 Directions for Further Research
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APPENDIXA Publications [Quax 03] P.
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APPENDIXB Dutch Summary - Samenvatt
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APPENDIXC C.1 Interactive Door Obje
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C.1 Interactive Door Object 173 <
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C.2 Physical Interactive Door Objec
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REFERENCES [3ds Max 07] Autodesk 3d
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179 Almitos, 1995. [Cal3D 07] Cal3D
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181 [Granny3D 07] Granny3D. http: /
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183 [Magnusson 02] C. Magnusson, K.
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185 Interaction, vol. 7, no. 4, pag
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187 Constraints for Articulated Fig
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