Browsing method of massive model data based on 3D digital city system

Abstract

The invention relates to a mass model data browsing method based on a three-dimensional digital city system. The method includes the first step of generating a geographic information mass three-dimensional model, and the second step of calculating rapid lookup units within a geographic coordinate range according to the geographic coordinate range in a three-dimensional digital city system window, finding out required three-dimensional monomer models from the rapid lookup units, finding out the required three-dimensional monomer models in a database, calculating the distances between a viewpoint and centers of the three-dimensional monomer models, loading models at corresponding levels in the database into a memorizer according to the distances, finding out invisible parts of the models through calculation of model data at classified levels and releasing the invisible parts of the models out of the memorizer, placing visible parts of the models into a graphic drawing pipeline of a graphics card, and finally displaying the visible parts of the models in the three-dimensional digital city system. According to the mass model data browsing method based on the three-dimensional digital city system, the monomer models in the mass three-dimensional model can be rapidly displayed, the time is short, the efficiency is high, and the requirement for hardware is low.

Description

technical field [0001] The invention belongs to the field of three-dimensional model display, in particular to a browsing method based on massive model data of a three-dimensional digital city system. Background technique [0002] Because the 3D digital city system usually covers tens of thousands of square kilometers, it may even expand into multiple cities. In such a range, the model data is usually several terabytes of data, and the existing hardware conditions cannot yet These data are all loaded into memory for one-time rendering, so the organization and management of these data in the scene is the most critical factor affecting system performance. Existing systems can usually only browse a relatively small area. If the 3D model data is too large, the system will freeze or even crash. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a browsing method based on the massive model data of...

AI Technical Summary

Problems solved by technology

[0002] Because the 3D digital city system usually covers tens of thousands of square kilometers, it may even expand into multiple cities. In such a range, the model data is usually several terabytes of data, and the existing hardware conditions cannot yet All these data are loaded into memory for one-time rendering, so the organization and management of these data in the scene is the most critical factor affecting system performance

Existing systems can usually only browse a relatively small area. If the 3D model data is too large, the system will freeze or even crash