ISSN : 1796-203X
Volume : 2    Issue : 8    Date : October 2007

3D Soft Body Simulation Using Mass-spring System with Internal Pressure Force and Simplified
Implicit Integration
Jaruwan Mesit, Ratan Guha, and Shafaq Chaudhry
Page(s): 34-43
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In this paper, we propose a method to simulate soft bodies by using gravitational force, spring and
damping forces between surface points, and internal molecular pressure forces. We consider a 3D
soft body model composed of mesh points that define the body’s surface such that the points are
connected by springs and influenced by internal molecular pressure forces. These pressure forces
have been modeled on gaseous molecular interactions. Simulation of soft body with internal
pressure forces is known to become unstable when high constants are used and is averted using
an implicit integration method. We propose an approximation to this implicit integration method that
considerably reduces the number of computations in the algorithm. Our results show that the
proposed method realistically simulates soft bodies and improves performance of the implicit
integration method.

Index Terms
Soft body simulation, implicit integration method, internal pressure force, mass-spring system