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Fast Visualization Method of 3D Model Based on Viewpoint Index

A 3D model and viewpoint technology, applied in the field of fast visualization of 3D models based on viewpoint index, can solve the problems of long loading time and large amount of model data, reduce model complexity, reduce data loading, and improve visualization effect Effect

Active Publication Date: 2017-12-19
NANJING USTEP INFORMATION TECH
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Problems solved by technology

[0009] Purpose of the invention: In order to solve the problems of excessive model data volume and long loading time in the current three-dimensional visualization of street view, the present invention proposes a fast three-dimensional visualization method based on viewpoint index, which can realize fast loading on mobile terminal equipment 3D street view data

Method used

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  • Fast Visualization Method of 3D Model Based on Viewpoint Index
  • Fast Visualization Method of 3D Model Based on Viewpoint Index
  • Fast Visualization Method of 3D Model Based on Viewpoint Index

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specific Embodiment approach

[0021] The invention mainly creates an index structure for the three-dimensional city model, and realizes fast model display in the visualization stage based on the index. The specific implementation is as follows:

[0022] 1. Model loading. First read the existing 3D city model, obtain the distribution of buildings in it, and generate road data. Since the present invention is aimed at the street view model, it is necessary to provide road data in advance. Specifically, corresponding to the real three-dimensional model of the city, the road data can be provided by the model itself, or the model road can be automatically generated by disclosing road information.

[0023] 2. Establish the graph description structure of the road. Analyze the road structure, especially its intersection relationship, describe the road with a graph data structure, road=, where each road segment includes two intersections, the start and the end, and each intersection can include one or multiple se...

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Abstract

The invention discloses a fast visualization method for a three-dimensional model based on a viewpoint index. By constructing a viewpoint index of a three-dimensional city model, the loading amount of three-dimensional model data on a mobile terminal is reduced; the automatic adjustment of the viewpoint index is realized according to the visual characteristics of the three-dimensional city model, In order to improve the accuracy of visualization, reduce the number of viewpoint indexes in the scene, and improve computing efficiency; the effective range of viewpoint indexes is predefined. During the visualization process of the 3D model of the mobile terminal, the user's current position and viewpoint are used as input, based on the predefined index range , automatically obtain the corresponding index, and select the viewpoint index located before and after it in the index sequence according to its viewpoint position and viewpoint direction, and merge its corresponding visible city 3D model element set to check whether the merged set has been loaded If there is a model in , it does not need to be loaded, otherwise, the 3D model is loaded and rendered, so as to reduce the complexity of the model and improve the visualization speed.

Description

technical field [0001] The present invention relates to an online visualization method for a three-dimensional city model, in particular to a fast visualization method for a three-dimensional model based on a viewpoint index. At the same time, it improves its visualization speed in mobile terminals. Background technique [0002] As the densest population, economy, technology, infrastructure, and information on the earth's surface, cities are geographical complexes with highly dense population, resources, and socioeconomic elements, and are also the most complex and active parts of the earth with the highest intensity of interpersonal communication. With the rapid expansion of the city, the problems of urban construction and management have become increasingly acute. As far as city builders and decision makers are concerned, the complexity of problem solving and the generalization of information to be processed in urban construction are unprecedented. In some important appl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T17/05G06T17/10G06T19/20
Inventor 任程毛波韩伟徐洪刚
Owner NANJING USTEP INFORMATION TECH
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