Method for stretching vector data into three-dimensional block model
A vector data, 3D technology, applied in the field of stretching vector data into a 3D volume model, can solve the problems of improving loading efficiency, affecting the loading and rendering efficiency of 3D scenes, and being unable to use the characteristics of 3D models, etc.
Pending Publication Date: 2022-07-15
德清县车网智联产业发展有限公司 +1
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[0004] Directly attach the vector surface to the terrain surface, and give different colors and transparency to the surface and edge of the vector surface; this method requires almost no data processing work, and its expression is almost the same as that seen in the two-dimensional map. The main problems are as follows: first, when the surface has complex structures and severe fluctuations (such as urban areas), the surface attached to the ground looks very broken; second, it is impossible to use the LOD and other characteristics of the 3D model to improve the loading efficiency. When the vector data When the amount is large, it will seriously affect the loading and rendering efficiency of the 3D scene
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[0036] It should be noted that the following detailed description is exemplary and intended to provide further explanation of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
[0037] It should be noted that the terminology used herein is for the purpose of describing specific embodiments only, and is not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural as well, furthermore, it is to be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates that There are features, steps, operations, devices, components and / or combinations thereof.
[0038]Furthermore, in the description of the present invention, it should be understood that the ...
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The invention relates to a method for stretching vector data into a three-dimensional block model. The method comprises the following steps: S1, judging whether a single polygon or a complex polygon is formed by the vector data; if the vector data are monotonic polygons, skipping to the step S2, and if the vector data are complex polygons, skipping to the step S3; s2, polygon vertexes of the vector data are arranged in a descending order according to the size of Y coordinates, and an ordered linked list or a priority queue is obtained; traversing each vertex of the monotonic polygon from the highest point to the lowest point, and executing corresponding operation according to left and right chain attributes; s3, performing triangulation processing on the complex polygons by adopting an ear cutting method; and S4, judging whether the two polygons are intersected or not. According to the method, various simple and complex polygons can be accurately recognized, and the polygons are cut by adopting a corresponding method, so that good conditions are created for converting two-dimensional vector data into a three-dimensional block model.
Description
technical field [0001] The invention relates to the technical field of three-dimensional data processing, and more particularly, to a method for extruding vector data into a three-dimensional block model. Background technique [0002] In the construction and application of 3D digital cities, superimposing 2D vector elements in 3D scenes has always been a very common requirement. It can well combine the characteristics of 2D and 3D integrated display to visually display planning, construction, management and other content. . At present, the application of 3D scenes has gradually shifted from cities to vast undeveloped areas, especially the 3D modeling, monitoring and management of natural resources, and the 3D expression of natural objects such as mountains, water, forests, fields, lakes, and grasses. And analysis, the traditional mode of fitting vectors to terrain or building simple blocks is difficult to meet the needs of application process scenarios. [0003] For a long...
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IPC IPC(8): G06T17/00
CPCG06T17/00
Inventor 黄灵武唐绍春何凤云
Owner 德清县车网智联产业发展有限公司