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Three-dimensional streamline volume rendering algorithm based on ocean flow field data

A streamline volume, three-dimensional technology, which is applied in the field of three-dimensional streamline volume rendering algorithm for ocean flow field data, can solve the problems of insufficiency, not targeting ocean flow field volume data, low visualization efficiency, etc., and achieves high visualization efficiency and large scale. The effect of superiority

Inactive Publication Date: 2013-03-27
北京中海新图科技有限公司 +1
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Problems solved by technology

These methods realize the LIC drawing of the two-dimensional vector field, but do not target the volume data of the ocean flow field, and cannot fully reflect the characteristics of the three-dimensional fluid motion
Due to the large amount of ocean current field data and changes with time, the algorithm based on CPU to generate 3D streamlines cannot meet the characteristics of high efficiency and real-time, and the visualization efficiency is low

Method used

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  • Three-dimensional streamline volume rendering algorithm based on ocean flow field data
  • Three-dimensional streamline volume rendering algorithm based on ocean flow field data
  • Three-dimensional streamline volume rendering algorithm based on ocean flow field data

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Embodiment Construction

[0013] According to the massive multi-dimensional dynamic characteristics of ocean flow field data, the present invention processes it into four-dimensional volume data (attributes are longitude, dimension, depth and flow field value); and expands the generation of LIC streamline tracking from a two-dimensional plane to a three-dimensional space, Finally, use the Ray-Casting method to draw and display on a two-dimensional plane. Include the following steps:

[0014] 1. Data preprocessing of 3D ocean current field

[0015] The organization form of marine data is a four-dimensional data body DataSet evenly distributed on the latitude and longitude plane, and the expression form is:

[0016] Value = DataSet(Lat, Lon, Dep, Time); Value ∈ {temp, salt, uvw};

[0017] The storage format is scientific data format NC file. The dimensions of the data volume include longitude, latitude, depth and time, and each data point stores the three-dimensional upward scalar value (UVW) of the f...

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Abstract

The invention belongs to the ocean visualization fields and particularly relates to a three-dimensional streamline volume rendering algorithm based on real ocean flow field data. According to the three-dimensional streamline volume rendering algorithm, a line integral convolution (LIC) method based on texture is expanded to three-dimensional vector field visualization, the generated three-dimensional streamline texture image is improved by designing sparse texture line noise and matching up an LIC convolution kernel, space depth feeling is remarkably strengthened, and a Volume LIC image is generated by means of a ray cast direct volume rendering method. The three-dimensional streamline volume rendering algorithm displays the full view of an ocean flow field in an image mode, and detailed changes can be shown. Due to the fact that the texture is a continuous image, the method based on the texture can solve the problem caused by density and spacing of arrow plots and vector lines. Therefore, the three-dimensional streamline volume rendering algorithm has great advantages.

Description

technical field [0001] The invention belongs to the field of ocean visualization, and in particular relates to a three-dimensional streamline volume rendering algorithm for ocean flow field data. Background technique [0002] With the continuous improvement of ocean detection methods, the ability of human beings to obtain ocean data has been continuously improved, and the amount of accumulated ocean data has become larger and larger. Accurate visualization of ocean data can help improve the efficiency of ocean science research. The special geographical environment of the ocean makes it difficult for people to directly and comprehensively observe the phenomena at all levels of the ocean and its internal characteristics. With the help of flow field data visualization technology, the ocean flow field data can be expressed as comprehensively and intuitively as possible to assist marine researchers in their interpretation work. [0003] For the visualization of 2D and 3D flow f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T15/08
Inventor 田丰林马纯永于方杰韩勇陈戈吴合义李勃
Owner 北京中海新图科技有限公司
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