Method for performing three-dimensional rendering on two-dimensional vector

Abstract

The invention discloses a method for performing three-dimensional rendering on a two-dimensional vector, which comprises the following steps of: S1, acquiring shp data from an shp file, performing data coordinate conversion on the shp data, converting the shp data into a build. Json file, and storing all data directories; s2, classifying the buildings according to the field content of the building information; s3, reading a build. json file, and obtaining coordinate points and height information of a vector surface; s4, calculating vertex element information of the three-dimensional building according to the coordinate points and the height information of vector surface; s5, creating groups according to the vertex element information, the style classification information, the arrangement vertex information, the color information and the normal vector information of the three-dimensional building, and creating a buffer Geometry object according to the groups; s6, obtaining coordinate information corresponding to the buffer Geometry object; and S7, according to the buffer Geometry and the material array materials, creating a mesh object, and according to the coordinate information, adding the mesh object into the three-dimensional scene for rendering.

Description

technical field [0001] The present invention relates to the field of visualization technology, in particular to a method for performing three-dimensional rendering of two-dimensional vectors. Background technique [0002] With the continuous development of GIS visualization technology, the visual display of city-level 3D buildings is becoming more and more extensive, and different types of buildings can be visualized in different styles; in webgis, the page is used as a carrier for efficient building preview, Smooth operation. [0003] There are currently several ways to support the visual display of 3D building data: [0004] 1. UAV collects oblique photography data; [0005] 2. Laser point cloud model data; [0006] 3. Artificial modeling data; [0007] 4. The vector house surface is stretched and displayed according to the height attribute of the building. [0008] However, the collection costs of the above oblique photography, laser point cloud, artificial modeling ...

AI Technical Summary

Problems solved by technology

However, first of all, this method needs to convert the vector building into a 3D model cache first, and the style must be pre-set, and it cannot be stylized and expressed in the software at will; secondly, the performance of cesium for this kind of 3Dtiles data rendering is still not satisfactory. The requirements of the PC, there will be a lag problem, and finally there is still a certain gap between the visual rendering of the cesium engine and the threejs engine

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