Spherical body drawing method capable of supporting real-time cutting operation

Abstract

The invention relates to a marine scalar field body drawing method capable of supporting a real-time cutting operation based on an earth spherical shell model. The method specifically comprises the steps of establishing a spherical shell agent geometric body in global and local cases respectively, and creating two index objects; obtaining data real-time longitude, latitude and depth ranges according to a cutting operation, calculating vertex coordinates in real time by using a calculation shader on a GPU; starting a depth test, and generating a front surface and a rear surface of light projection; and realizing a light projection algorithm based on the earth spherical shell model on the GPU by adopting a shader language GLSL. Coordinate transformation is performed during the process of light projection, a path of light projection is converted from world coordinates into longitude, latitude and depth coordinates. The spherical body drawing method calculates the vertex coordinates in real time at the GPU terminal by using the calculation shader, can support a real-time cutting operation of the marine water data and has a good visualization effect for marine scalar field data with different longitude, latitude and depth ranges.

Description

technical field [0001] The invention relates to a marine scalar field spheroid drawing method supporting real-time clipping operation, which belongs to the field of graphic drawing. Background technique [0002] With the increasingly multi-source development of ocean observation methods, the range span and temporal and spatial resolution of ocean data have been greatly improved, and we have entered the era of big data. Traditional ocean visualization and analysis techniques are difficult to deal with the analysis challenges of massive, high-dimensional, multi-source and dynamic data. More comprehensive visualization, graphics, and data mining theories and methods are needed to study new theoretical models, new visualization methods and The new user interaction method assists users to quickly mine useful information from large-scale, complex, contradictory and even incomplete data, and promotes the development of marine science. The visualization of the ocean data sphere mod...

AI Technical Summary

Problems solved by technology

[0003] At present, the domestic and foreign cases of realizing the visualization of ocean water elements based on the ocean sphere model include: in the EarthNullschool global meteorological animation map, the temporal and spatial distribution of ocean, atmospheric, and chemical pollutant particles can be expressed on a large scale, but there is a lack of three-dimensional ocean temperature and salinity data. expression; some domestic scientific research institutes have also explored the visualization of the ocean scalar field based on the sphere model, but it can only be visualized for data in a fixed range, and cannot support real-time clipping in the three directions of latitude and longitude.

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