Three-dimensional cloud motion evolution method based on physics

Abstract

The invention discloses a three-dimensional cloud motion evolution method based on physics, belongs to the field of computer graphics, and can realize automatic evolution from an initial three-dimensional cloud shape motion to a target shape by taking two natural cloud images as input. The method comprises the following steps: firstly, respectively reconstructing a three-dimensional cumulative cloud model from two given cumulative cloud natural images, and carrying out particle sampling on a first three-dimensional cumulative cloud model to obtain cloud particle data; secondly, solving a thermodynamic equation, a state change equation and a motion equation of the cumulative cloud in an atmospheric motion process to realize a physical motion process of the cumulative cloud; thirdly, adopting the PBF method to keep the density of cloud particles unchanged in the movement process, and to guarantee incompressibility of the accumulated cloud in the movement process; then, performing surfaceparticle sampling on the target shape, and achieving coupling of cloud particles and the target shape in combination with a fluid-solid interaction strategy; and finally, adjusting an external forceapplied to the cloud in the movement process according to the movement states of the time frames before and after the cloud, and driving the physical movement process of the cloud until the final shape is consistent with the target shape.

Description

Technical field [0001] The invention belongs to the field of computer graphics, particularly 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 continuously 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 fluid type, cloud simulation has become a hot topic in computer graphics and virtual reality technology. In outdoor scene simulation, if cloud simulation is added to the sky, it will enhance the fidelity of the entire scene and obtain better visual effects; in 3D games, virtual clouds will greatly improve the player’s gaming experience; Cloud...

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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