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GPU-based interactive three-dimensional flow field adaptive resolution dynamic visualization algorithm

A three-dimensional flow field and self-adaptive technology, applied in the field of scientific computing visualization, can solve problems such as the inability to express the internal structure of the three-dimensional flow field, the occlusion of the icon method, and the difficulty of real-time interaction, etc., to achieve the effect of convenient observation and understanding

Active Publication Date: 2018-01-26
OCEAN UNIV OF CHINA
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AI Technical Summary

Problems solved by technology

The icon method generally uses vector arrows. The direction of the arrow indicates the flow field velocity direction, and the velocity is mapped to the color space. The icon method has serious occlusion problems, and it is difficult to achieve real-time interaction; the texture method uses texture images to express the flow field Features, which are characterized by being able to express more details of the flow field such as: vortex, source point, saddle point, but the texture method still cannot solve the occlusion problem, and cannot express the internal structure of the three-dimensional flow field, so this method is more suitable for expressing two-dimensional flow field; the streamline placement algorithm based on feature extraction focuses on expressing a certain feature of the flow field, such as flow field topological information such as vortex, rather than expressing all flow field information, and this method requires a lot of preprocessing before visualization, so Not suitable for real-time interactive 3D flow field visualization

Method used

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  • GPU-based interactive three-dimensional flow field adaptive resolution dynamic visualization algorithm
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  • GPU-based interactive three-dimensional flow field adaptive resolution dynamic visualization algorithm

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Embodiment Construction

[0018] The invention distributes particles evenly and densely in the viewing volume, renders the far and near planes of the data volume to correct the sprinkle point position, samples the velocity field to drive the particle movement, and creates a probability density map to control the particle distribution; by integrating in Tessellation Shader based on the particle The position extends out of the streamlines. Include the following steps:

[0019] 1. Render the near and far planes of the data volume into textures

[0020] The data volume is generated according to the data range, and the outer and inner surfaces of the data volume are respectively rendered to obtain the near plane and the far plane of the data volume. The depth value of each pixel in the frustum is the distance from the near clipping plane. Divide this depth value by the vertical distance between the far and near clipping planes and store the result as a color value. Obtain two textures of the far and near ...

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Abstract

The present invention belongs to the scientific computing visualization field and relates to a GPU-based interactive three-dimensional flow field adaptive resolution dynamic visualization algorithm. According to the algorithm, seed points are evenly placed in a view-frustum; a part of seed points which are scattered outside a data range are moved into the data range according to the near plane andfar plane texture of a pre-rendered data body; probability density spheres are generated, and are rendered into probability density bodies, so that the particles can be evenly distributed in motion;and a GPU-accelerated rendering technology is used to generate a streamline, and the Tessellation subdivision surface technology is used to expand the streamline into a pipeline, and therefore, the adaptive resolution dynamic visualization drawing of a three-dimensional flow field can be realized.

Description

technical field [0001] The invention belongs to the field of scientific computing visualization, and in particular relates to a GPU-based interactive three-dimensional flow field adaptive resolution dynamic visualization algorithm. Background technique [0002] Flow field visualization is an important branch in the field of scientific visualization. With the improvement of computer computing capabilities, especially the improvement of GPU parallel processing capabilities and the abundance of observation data and model data, dynamic visualization of three-dimensional ocean flow fields has become possible. The 3D visualization of the flow field is of great significance to the study of the generation, development and extinction of ocean currents. Therefore, the visualization of 3D flow field has received more and more attention. However, the inherent characteristics of 3D flow field, such as large amount of data, many variables, and changes over time, pose a great challenge to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T15/00G06T15/04G06T17/00
Inventor 田丰林程领骑陈戈
Owner OCEAN UNIV OF CHINA
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