Project description:
The deformation modeling should be designed in the broad contexts of
a simulation system, interaction, and usability. While many
important breakthroughs have been made in modeling the deformation
of a single soft body to pre-defined external forces, the simulation
of isolated deformable objects has few practical applications
especially in the virtual surgery. The interaction between a soft
tissue and surrounding bodies (surgical instruments, bones, other
soft tissues, fluids, etc.) is very complicated since they are
highly deformable under contacts. We have led the development of a
constraint-based contact model between deformable objects using a
finite element method and nonlinear optimization. In contrast to the
existing penalty force based method, our constraint based contact
model guarantees tight error bound at the contact regions and
maintaining hard constraints without overshoot or oscillation at the
boundaries. New techniques in active constraint management and
reducing the overhead of modifying the active constraint set are
investigated to further optimize the system. In addition, we have
developed a fast and robust collision detection and resolution
scheme for deformable objects using a new enhanced spherical
implicit surface hierarchy. It extends the hierarchical spherical
surface to the sub-divided triangle level adaptively to detect and
resolve collisions within a tight error bound. It is designed to
handle massive collisions at a given iteration step so its
applicability is wide across variety of deformable structures as
long as their surface is meshed with triangles.
Publications:
Sunwha Jung, Min Hong, Min-Hyung Choi, “An Adaptive Collision Detection
and Resolution for Deformable Objects Using Spherical Implicit Surface”,
Proceedings of International Conference on Computational
Science Visualization and Virtual Reality, June 2005
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Min
Hong, Min-Hyung Choi, Chris Lee, “Constraint-based Contact
Analysis between Deformable Tissue Structures for Surgical
Simulation in Virtual Environment”, Proceedings of
International Conference on Computational Science Visualization
and Virtual Reality, June 2004
Also published in
Springer-Verlag Lecture Notes in Computer Science, Vol.
3037, pp. 300-308.
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