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Fluid animation rendering method based on detail capturing and form correcting

A detailed and fluid technology, applied in animation production, image data processing, instruments, etc., can solve the problems of inapplicable fluid animation, fluid simulation acceleration, etc., and achieve the effect of maintaining fluid animation details, fast simulation speed, and reducing calculation scale

Inactive Publication Date: 2014-12-31
SHANGHAI JIAOTONG UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

However, the octree model simplification strategy in this technology is only used to speed up the drawing update step, and does not speed up the steps of fluid simulation, and this method is also limited to the phenomenon of cloud flow, which is not suitable for general fluid animation simulation

Method used

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  • Fluid animation rendering method based on detail capturing and form correcting

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Embodiment 1

[0042] In this embodiment, a fluid animation scene in which smoke rises is used. The scene is surrounded by obstacles, and the smoke rises continuously from the round hole at the bottom of the scene. A ball is encountered in the process of ascending, and a large number of fluid details are generated near the ball, resulting in a very gorgeous fluid animation effect. This embodiment uses a traditional fluid simulation framework for illustration.

[0043] Such as figure 1 As shown, this embodiment includes the following steps:

[0044] Step 1. According to the above scene settings, divide the entire scene space into 128*256*128 grids, set the initial velocity field of the fluid simulation to 0, set the initial density field to 1 near the scene hole, and the initial temperature field to is 310, set the boundary conditions according to the scene requirements, that is, generate an identifier array obstacle, set it to true in the grid occupied by the sphere, set the time step to Δt...

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Abstract

The invention discloses a fluid animation rendering method based on detail capturing and form correcting in the technical field of computer image processing. The method comprises the following steps of: performing fluid simulation and optimizing a speed field in an initial scene according to a Navier-Stokes equation; updating a corresponding density field and a corresponding temperature field according to the optimized high-precision speed field by adopting a semi-Lagrangian method so as to be used for rendering and next-frame simulating; and finally, rendering an updated density field into a fluid animation. More colorful details can be captured through a high-speed discrete sine transform operator, the calculation scale of a part with highest time consumption in an original simulation method can be reduced through using a down-sampling or octree method, simultaneously the result is corrected, and the functions of increasing the simulation speed and keeping fluid simulation details are realized. Compared with the prior art, according to the method, the simulation speed is relatively high, and the fluid simulation details with high more accuracy can be acquired.

Description

technical field [0001] The invention relates to a method in the technical field of computer image processing, in particular to a fluid animation rendering method based on detail capture and shape correction. Background technique [0002] In the field of computer graphics, fluid animation, including water, smoke, explosions and similar phenomena, has become more and more popular because of its rich and gorgeous details, making it more popular in film, animation, games and other fields. The level of brilliance means to attract the eye. Moreover, due to the complexity of fluid details, fluid simulation becomes very difficult, thus attracting more and more scientists into the field of fluid simulation. [0003] The more convincing method in fluid simulation now is the Euler method. In "Stable Fluids" (1999) published by Jos Stam on "SIGGRAPH", the original simulation method was improved. At that time, it was obtained In order to achieve more ideal fluid animation details and m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T13/00
Inventor 吴箫钺杨旭波杨阳
Owner SHANGHAI JIAOTONG UNIV
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