Three-dimensional vector real-time dynamic stacking technique based on LOD (Level of Detail) transparent textures

Abstract

The invention discloses a three-dimensional vector real-time dynamic stacking technique based on multiple LOD (Level of Detail) transparent textures. The three-dimensional vector real-time dynamic stacking technique comprises the following steps of: firstly, drawing various vector layers on the transparent textures of corresponding plotting scales respectively in an internal memory through data pre-processing, automatically carrying out block cutting on the vector layers, then saving the vector layers in a disk as an LOD pyramid data storage structure, and establishing a mapping relation with a same-level terrain and an image data block; and secondly, in a real-time terrain rendering and roaming stage, loading the transparent textures of vectors of the corresponding layers through dynamic selection, stacking the vector layers into the same level of image data block according to an established Alpha passage, and realizing the real-time stacking of the vector layers in the three-dimensional terrain based on an internal memory multi-passage texture blending technology. According to seamless visualization of high-resolution vector map data and a digital elevation model, the effect of the high-resolution vector map data and the digital elevation model in spatial information expression and analysis can be enhanced. According to the technique, the real time stacking of multilayer vector data in the rendering and roaming stage of a large-scale three-dimensional terrain scene is realized, and the dynamic interactive screening of the vector layers is supported.

Description

technical field [0001] The invention belongs to the core technology of real-time and efficient rendering of large-scale vector data in three-dimensional visual simulation, and adopts a method based on real-time dynamic loading of multiple LOD transparent textures to realize layered, real-time, efficient and dynamic overlay rendering of vector data in large-scale three-dimensional virtual scenes. Background technique [0002] 3D virtual simulation technology is an immersive interactive environment based on computable information. Specifically, it uses modern high-tech means with computer technology as the core to generate a realistic virtual environment, so that users can interact with the virtual environment in a natural way with the help of equipment. The objects in the environment interact and influence each other, thereby producing the feeling and experience of being in the same real environment. [0003] With the continuous development of 3D modeling technology, the amou...

AI Technical Summary

Problems solved by technology

[0004] In recent years, many 3D vector data overlay display methods have appeared, but the conventional methods all have an important shortcoming, that is, they generally require the entire vector data to be loaded into the memory for drawing at the same time, and then map display on the terrain. It will inevitably result in the occupation of a large amount of memory space and the consumption of computing resources.

Due to the limited memory capacity of the computer, when it is necessary to superimpose vector data display for large-scale 3D scenes, the traditional vector data display superimposition method is almost inadvisable

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