Improvement In Controllable Simulation Of Smoke Movement And Deformation

Animation designers often wish to get the ideal fluid simulation quickly throughsimple and efficient operation. Therefore, the controllabe smoke simulation has a widerange of applications in the game, the film, television special effects and so on. In orderto quickly and efficiently realize the controllabe smoke simulation while preserving thecomplicated characteristics of smoke motion according to the designer's will. The paperbased on the external force physical method and respectively focus on controlling themovement path of smoke and target-driven smoke deformation these two differentaspects.Firstly, for the purpose of realizing the controllable smoke simulation, thenon-viscous incompressible Navier-Stokes equations is adopted to establish the physicalmodel of smoke, and conrolling the motion of smoke through introducing a attractingforce and a driving force in the external force term. At the same time, the MacCormackmethod is applied to reduce the numerical dissipation in solving the Navier-Stokesequations and preserve the smoke details well.Secondly, aim at the designing needs of controlling smoke movement,.a simulationmethod is presented which is using the external force to control the movement path ofsmoke. The path boundary grids and the internal grids are identified according to Bspline curve and the specified path radius. The attraction coefficient of the external gridsis calculated before the smoke simulation in order to reduce the calculation time ofattracting force.Thirdly, in order to satisfy the designing needs of target-driven smoke simulation,Through the pretreatment such as the2d image boundary extraction and the voxelizationof3d model to mark out the internal grids and boundary grids of targets, and theattraction coefficient of external grids is calculated in advance to shorten the attractioncoefficient calculation time, thus speeding up the smoke deformation. At the same timerealized the fast interactive simulations between the free smoke and the deformed smokethrough introduction of local grids. Finally, in order to verify the improved controllable smoke simulation algorithms,the VC++language and Open Graphics Library are used to design the controllable smokesimulation system on Windows platform. Experiment results show: through the proposedalgorithm the controllable simulation of the natural-looking smoke can be effectivelyrealized according to the designer's willingness, and the fast interactive simulationsbetween the free smoke and the deformed smoke in the same flow field can also berealized.