Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Boundary Line Extraction Method of 3D Model Based on VRML Technology

A three-dimensional model and extraction method technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as the inability to directly obtain model boundary line data, and achieve simple and reliable calculation process, small data volume, and easy programming. Effect

Active Publication Date: 2016-08-31
JIANGSU XINDA COMM TECH
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the model boundary line data cannot be obtained directly from the 3D modeling software, the present invention starts from the 3D model and provides a method for extracting the boundary line of the 3D model based on VRML technology. This method has a wide range of applications and can handle arbitrary complex shapes. 3D model of appearance

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
  • Boundary Line Extraction Method of 3D Model Based on VRML Technology
  • Boundary Line Extraction Method of 3D Model Based on VRML Technology
  • Boundary Line Extraction Method of 3D Model Based on VRML Technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] refer to Figure 1 to Figure 5 , and taking the boundary line extraction of hexagonal prism as an example, a method for extracting boundary lines of 3D models based on VRML technology is provided. The boundary line extraction method comprises the following steps:

[0024] The first step is to read the VRML file, the file extension is wrl, and the 3D graphics information described in the file is mainly composed of the following four parts: coordinate point (Coordinate point), point normal vector (Normal vector), triangle surface vertex sequence (CoordIndex ), point normal sequence (NormalIndex). The main content of the VRML file corresponding to the hexagonal prism model is as follows:

[0025] coord Coordinate{#coordinate point

[0026] point[

[0027] -17.320509 0 0, -17.320509 0 20,

[0028] -8.660254-15 0, -8.660254-15 20,

[0029] -8.660254 15 0, -8.6...

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

A kind of three-dimensional model boundary line extraction method based on VRML technology, described boundary line extraction method comprises the following steps: (1) read VRML file, and adopt regular expression to recognize text data, then data is stored in the array in certain form ; (2) The user sets the "normal vector mutation threshold T", referred to as "threshold T", and its value is based on the maximum curvature value on the three-dimensional model. The larger the curvature, the larger the threshold should be; (3) the unit normal vector array The normal vectors inside are subtracted in pairs, then the vector modulus is taken, compared with the threshold T, and the diagonal lines and repeated boundary lines are deleted according to the comparison results; (4) The remaining line segments are sorted out to obtain an array of boundary lines, and the coordinates The arrays are written together to a data table file and saved to the computer disk. This method has a wide range of applications and can handle 3D models with arbitrary complex shapes.

Description

technical field [0001] The invention relates to the field of computer graphics, and relates to a method for extracting boundary lines of three-dimensional models based on VRML technology. Background technique [0002] At present, the research on the boundary line extraction of 3D models mainly includes the following two aspects: (1) From the perspective of the two-dimensional image, some image processing methods are used to extract the boundary line, and the extraction result is another picture. Obviously, this method cannot contain The analytical formula of each boundary line in three dimensions; (2) Starting from the real object, the point cloud is obtained by scanning or measuring, and then the points belonging to the boundary line are obtained through a search algorithm, and finally the reverse modeling is performed on the computer. The second method can obtain the analytical expression of the boundary line in 3D, can handle dense point cloud data, and is generally used ...

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
Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 金明生计时鸣张鹤腾张利蔡东海
Owner JIANGSU XINDA COMM TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com