Three-dimensional model fast visualization method based on viewpoint indexes

A 3D model and viewpoint technology, which is 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: 2015-12-16
NANJING USTEP INFORMATION TECH
View PDF5 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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, t

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Three-dimensional model fast visualization method based on viewpoint indexes
  • Three-dimensional model fast visualization method based on viewpoint indexes
  • Three-dimensional model fast visualization method based on viewpoint indexes

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The present invention discloses a three-dimensional model fast visualization method based on viewpoint indexes. By constructing the viewpoint indexes of a three-dimensional city model, a three-dimensional model data loading quantity on a mobile terminal is reduced; according to visual features of the three-dimensional city model, automatic adjustment of the viewpoint indexes is implemented, so that visualization accuracy is improved, the number of the viewpoint indexes in a scene is reduced and calculation efficiency is promoted; and a viewpoint index effective range is predefined, a current position and a current view angle of a user are used as inputs and the corresponding indexes are automatically acquired on the basis of the predefined index range in the three-dimensional model visualization process of the mobile terminal, the viewpoint indexes positioned in the front and behind the user are selected in an index sequence according to a viewpoint position and a view angle direction of the user, visible city three-dimensional model element sets corresponding to the selected viewpoint indexes are merged, the model in the merged set is checked whether to be loaded, the three-dimensional model does not need to be loaded if yes, or the three-dimensional model is loaded and rendered, so that reduction of model complexity and improvement of a visualization speed are realized.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G06T17/05G06T17/10G06T19/20
Inventor 任程毛波韩伟徐洪刚
Owner NANJING USTEP INFORMATION TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap