Abstract: Realistic simulation of different types of objects in real world is an important task of
physical animation. However, it is still hard to realize simulating based on a unified numerical
method. Based on smoothed particle hydrodynamics and continuum mechanics, we propose a unified
particle-based method to simulate physical animation, and realistically simulate rigid objects, elastic
objects and incompressible fluids. Moreover, by combining the adaptive sampling scheme and
relative contribution computation of surface particles of objects, we present a stable fluid-solid
coupling algorithm. The results demonstrate that our method is suitable for the unified modeling and
simulation of different objects in virtual scenes.

Key words: physical animation, particle-based method, elastic deformation, rigid solid, fluid;
fluid-solid coupling