Curvature flow-based screen space fluid rendering method

Abstract

The invention relates to a curvature flow-based screen space fluid rendering method comprising the following steps: in step S1, a smooth particle fluid model of a three dimensional object in a screen space is obtained, the model comprises positions and speed of particles, a depth image of particles of fluid surfaces is generated, and a nearest surface of the three dimensional object is determined; a method for determining the nearest surface of the three dimensional object comprises the following steps: if an object intersects with the same straight line in a direction of an optical axis at two or more intersection points, an intersection point which is a minimum distance away from a camera is used as a point on the nearest surface; in step S2, the nearest surface is smoothed via curvature flow filtering operation; in step S3, the number of fluids between each point and the nearest surface is calculated as thickness of the point; in step S4, noise is added to the nearest surface; in step S5, color and transparency of each point are weakened according to the thickness of the point and the speed of the particles, and a fluid rendering graph can be obtained. Compared with technologies of the prior art, the curvature flow-based screen space fluid rendering method is advantaged by high speed, and all processing can be directly finished via graphic hardware.

Description

technical field [0001] The invention relates to an image rendering method, in particular to a screen space fluid rendering method based on curvature flow. Background technique [0002] For interactive applications, such as games, particle-based fluid simulation methods such as Smoothed Particle Hydrodynamics (SPH) usually favor the Eulerian fluid representation. This is due to the fact that fluids can flow freely without defining a fluid mesh, which is usually very memory and computationally expensive. SPH simulation is a powerful tool for simulating fluids, but requires advanced techniques to achieve realistic rendering of the results. [0003] With particles being able to collide with scene geometry like other rigid objects, particle methods are also easier to integrate into existing physics systems without needing to voxel the scene geometry into meshes. Its downside is that it becomes more difficult to extract a surface for rendering. Among the existing methods, most ...

AI Technical Summary

Problems solved by technology

Its downside is that it becomes more difficult to extract a surface for rendering

Among the existing methods, most of the methods for rendering particle fluids are not suitable for real-time use in games

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