Position-based fluid simulation control method and system

Abstract

A position-based fluid simulation control method and system in the field of computer image processing, which obtains control particles by voxelizing a target shape model provided by the user, and allows the user to provide bone motion data (BVH) files to smooth the obtained control particles Morph, generating a bone-driven animation sequence represented by particles. In order to control the shape of the fluid simulation to match the previously generated model represented by the control particles, three control constraints are applied to the fluid particles, which are density constraints, elastic constraints, and velocity constraints. The density constraint is used to drive the fluid particles to form the target shape, the elastic constraint can drive the fluid particles to track the rapidly changing target shape, and the velocity constraint is used to control the velocity of the fluid particles. The invention can maintain the physical details and characteristics of the fluid under the condition of controlling the fluid simulation to form the target shape set by the user. At the same time, by adopting a position-based physical calculation framework, it allows the use of arbitrarily large time steps, thereby realizing real-time large-scale fluid flow Simulation and control.

Description

technical field [0001] The present invention relates to a technology in the field of computer graphics, specifically a method of applying three nonlinear constraints to fluid particles so that the simulated shape of the fluid matches the rapidly changing target shape while maintaining the details and details of the fluid itself. Methods and systems for physical characterization. Background technique [0002] Fluid simulation has become an increasingly popular topic in the field of computer graphics. Many natural phenomena, such as water, smoke, flames, etc., are closely related to fluid simulation. For this reason, many effective algorithms have been proposed by industry personnel to simulate realistic fluid effects. [0003] At present, the relevant algorithms for simulating fluid effects are relatively mature. Whether it is the grid-based Euler method or the particle-based Lagrangian method, they can simulate fluid effects more accurately. However, with the continuous de...

AI Technical Summary

Problems solved by technology

This method solves the time-consuming and resource-consuming problem in the Euler-based fluid simulation control method to a certain extent, but because the introduced control force is linear and inconsistent with the nonlinear characteristics of the fluid physics equation, it cannot apply a large control force. Otherwise it will cause fluid simulation instability, so this method cannot control fluid tracking and matching fast moving targets

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