Marine scalar field volume rendering method based on earth sphere model

Abstract

The invention discloses a marine scalar field volume rendering method based on an earth sphere model. The method concretely comprises the following steps: adopting an arc-shaped body composed of six gridding faces to substitute a cuboid as an agent geometry; conducting coordination transformation on the agent geometry composed of the arc-shaped body in the process of light projection, and converting a light projection path from world coordinates to high warp / weft coordinates; improving the frame rate of dynamic rendering through dynamic changing multithreading pre-loading of visualization effect and the LOD rendering method of the arc-shaped body; adopting a coloring language GLSL to realize the light projection volume rendering algorithm based on the sphere model on a GPU. According to the method, through coordinate transformation, drawn bodies can be attached to the surface of the earth precisely, and data and the boundary of the land are accurate. The method has the advantages of being good in visualization effect and high in rendering efficiency, and has good expandability at the same time.

Description

technical field [0001] The invention relates to a method for rendering an ocean scalar field, in particular to a method for rendering an ocean scalar field based on an earth sphere model. Background technique [0002] The visualization of ocean water body is an important content of "digital ocean" research, and the volume rendering of three-dimensional data field is the focus and difficulty of ocean water body visualization. [0003] The sphere model system is currently a research hotspot in the field of GIS. With its powerful spatial data management capabilities and rich and intuitive information presentation capabilities, it has rapidly become a powerful platform for spatial information integration and sharing, and is the basis for the construction of "Digital Earth" and "Digital Ocean". The data structure of the ocean water body is complex. The three-dimensional field data of the ocean water body derived from the data model has three dimensions: longitude, dimension and d...

AI Technical Summary

Problems solved by technology

The data structure of the ocean water body is complex. The three-dimensional field data of the ocean water body derived from the data model has three dimensions: longitude, dimension and depth. The large data range and the improvement of the spatial resolution will lead to a surge in the amount of data, and the depth often has the characteristics of irregular distribution. Difficulties in visualizing ocean water bodies based on the sphere model

[0004] At present, domestic and foreign cases of ocean water visualization based on the sphere model of the earth include: Google launched Google Ocean in early 2009, which is an extension of the land. Although it can display the seabed terrain in a large range, it has not realized the visual expression of ocean water elements. ; There are also some, for example, the software has made some attempts in sea surface simulation and ocean information visualization, but it does not involve 3D water body visualization; the 3D water body visualization expression adopted by the "Digital Ocean" prototype system is integrated in the form of plug-ins, and the result is a plane 3D visualization, does not blend well with the Earth sphere model

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