A physics-based method for 3D cloud motion evolution

Abstract

The invention discloses a physics-based three-dimensional cloud motion evolution method, which belongs to the field of computer graphics. The method takes two natural cumulus images as input, and can realize automatic motion evolution from an initial three-dimensional cumulus shape to a target shape. Firstly, the three-dimensional cumulus model is reconstructed from two given natural images of cumulus, and the particle sampling is performed on the first three-dimensional cumulus model to obtain cloud particle data; secondly, the thermodynamic equation and state of cumulus in the process of atmospheric movement are solved Change equations and motion equations to realize the physical movement process of cumulus clouds; again, use the PBF method to maintain the density of cloud particles during the movement process to ensure the incompressibility of cumulus clouds during the movement process; then, through the target shape Surface particle sampling, combined with the fluid-solid interaction strategy, realizes the coupling between cloud particles and the target shape; finally, according to the motion state of the cumulus before and after the time frame, the external force received by the cumulus during the movement is adjusted, and the physical movement process of the cumulus is driven until The final shape matches the target shape.

Description

technical field [0001] The invention belongs to the field of computer graphics, in particular to the field of cumulus simulation, and specifically relates to a physics-based three-dimensional cloud motion evolution method. Background technique [0002] With the improvement of living standards and the continuous advancement of technology, people's requirements for realism and interactivity in digital products are also increasing. As an important part of the real world, fluid can be encountered anytime and anywhere in people's life and production activities. Its basic feature is that it has no fixed shape and is highly dynamic. As a type of fluid, the simulation of cloud has become a hot topic in computer graphics and virtual reality technology. In the simulation of outdoor scenes, if the simulation of clouds is added to the sky, it will enhance the fidelity of the whole scene and obtain better visual effects; in 3D games, virtual clouds will greatly improve the game experien...

AI Technical Summary

Problems solved by technology

Process-based methods use particle systems, noise textures, or interactive means to model clouds, usually requiring tedious parameter adjustments; the latter simulates the physical process of cloud generation by solving simplified Novier-Stokes equations. The method is time-consuming

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