Abstract: Fluid simulation is an important research branch of computer graphics, solid boundary
treatment of fluid has always been the focus of fluid simulation, image particle method in smooth
particle hydrodynamics is an important method to deal with solid boundary. Image particle method
deals with solid boundary problems by dynamically generating corresponding mirror particles outside
the boundary by fluid particles near the boundary. However, with the improvement of the complexity
of the boundary, the complexity of the traditional mirror particle method to generate the mirror
particles is also increased, and the simulation efficiency is reduced. In order to solve the above
problem, the mirror particle method is improved in this paper by giving a new technique for
calculating values of mirror particle field, which effectively reduces the complexity of the generation
of traditional mirror particles with complex boundary conditions, and the field of fluid particles near
the boundary is more uniform. A lot of simulation results show that this method becomes more
efficient compared with the mirror particle method with the increasement of the number of particles
and the complexity of the scene.

Key words: smoothed particle hydrodynaimics method, fluid simulation, solid boundary treatment;
ghost particle field, complex scene