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PhD Thesis Abstract
by Dr Vassilios Hurmusiadis
Many natural materials and most of living tissues exhibit complex deformable
behaviours that may be characterised as organic. In computer animation,
deformable organic material behaviour is needed for the development of
characters and scenes based on living creatures and natural phenomena.
This study addresses the problem of deformable organic material behaviour
in computer animated objects. The focus of this study is concentrated on
problems inherent in geometry based deformation techniques, such as non-intuitive
interaction and difficulty in achieving realism. Further, the focus is
concentrated on problems inherent in physically based deformation techniques,
such as inefficiency and difficulty in enforcing spatial and temporal constraints.
The main objective in this study is to find a general and efficient solution
to interaction and animation of deformable 3D objects with natural organic
material properties and constrainable behaviour. The solution must provide
an interaction and animation framework suitable for the creation of animated
deformable characters. An implementation of physical organic material properties
such as plasticity, elasticity and viscoelasticity can provide the basis
for an organic deformation model. An efficient approach to stress and strain
control is introduced with a deformation tool named Vector Offset Operator.
Stress / strain graphs control the elastoplastic behaviour of the model.
Strain creep, stress relaxation and hysteresis graphs control the viscoelastic
behaviour of the model. External forces may be applied using motion paths
equipped with momentum / time graphs. Finally, spatial and temporal constraints
are applied directly on vector operators. The suggested generic deformation
tool introduces an intermediate layer between user interaction, deformation,
elastoplastic and viscoelastic material behaviour and spatial and temporal
constraints. This results in an efficient approach to deformation, frees
object representation from deformation, facilitates the application of
constraints and enables further development.
viscoelastic sphere |
elastic cube |
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stork | plankton | sperm whale | giant squid | blue whale | human | voodoo | home | contact
Copyright Dr Vassilios Hurmusiadis 2001.