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We develop and study techniques
for interactive simulation of flexible materials.
We focus on the challenge
of finding physical
models and numerical
methods with
satisfactory
tradeoff between speed, stability, and accuracy with respect to the
real world. In particular,
our techniques are capable
of dealing with stiff materials.
Videos:
Rigid body based
cable capable of supending heavy masses (up to 100000 times the cable element)
and with deformation forces based on solid mechanics. For increased
efficiency the cable has adaptive level of detail.
crane_demo_motion.avi (1.61 MB)
Model combining massless cable with lumped masses.
Frictional contact between the cable and the rotating drum. Adaptive
line discretization makes the method very robust and time efficient
even at large stiffness and heavy loads.
StickFriction_1Ton_box.avi
(5.3 MB)
drum_1000kg_box.avi (7.1
MB)
dyn_line_10000kg_small_box.avi (10.9 MB)
rig_ship_anchor_chaser.avi (18.4 MB)
agx_routing.avi (5.0 MB)
Interactive
simlation of elastic deformable material. The model is particle
based (lumped elements). The simulation parameters are the
conventional
material parameters
(Young's moduls, Poisson ratio etc). The materials values may be set
to infinitely stiff, including fully incompressible.
deformable.avi (3.0 MB)
deformable_heavy.avi (3.6 MB)
(8000 ton beam)
deformable_incompressible.avi (2.1 MB)
A system of rigid bodies connected by
massless cables. The massless cable constraint allows
to connect any number of bodies and it maintains the total length.
For the two smaller boxes the no-twist constraint makes the
co-rotate to maintain zero twist in the cable attaching them. When
the constraint is relaxed, realsitic length and twist elasticity is
introduced.
massless.mpg (1.5 MB)
Publications:
Rigid Body Cable for Virtual
Environments,
by
M. Servin and
C. Lacoursière,
accepted for publication in IEEE
Transactions on Visualization and Computer Graphics
(2008).
Massless cable for real-time
simulation,
by
M. Servin and
C. Lacoursière,
Computer Graphics Forum
26, 2 (June), 172-184 (2007).
Interactive simulation of elastic
deformable materials,
by
M. Servin,
C. Lacoursière and N. Melin,
In Proceedings of SIGRAD Conference 2006 in Skövde, Sweden,
Linköping University Electronic Press, Linköping, 22-32 (2006).
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