Cloud is an important element in synthetic outdoor scenes. Many methods have been developed for simulating realistic clouds. The image-based cloud modeling methods can estimate cloud shape similar to the input image. However, simulating clouds motion based on multiple images remains a challenging task. This paper presents a method of simulating the cloud's 3D motion between two natural images, which are treated as the initial and target shapes, respectively. Atmospheric hydrodynamics combined with particle system is used to generate clouds physical movement. Then, taking the target shape as constraint, the driving forces are calculated and the control over the cloud movement is realized. Finally, we apply the PBF approach to ensure the cloud's incompressibility. The experiment results show that the proposed method can effectively simulate cloud evolution between discrepant initial and target shapes.

cloud evoltion, fluid control, physical animation,particle-based fluid