Three-dimensional segmenting method for STL (Standard Template Library) triangular network model

Abstract

The invention discloses a three-dimensional segmenting method for an STL (Standard Template Library) triangular network model in rapid molding process. The three-dimensional segmenting method comprises the following steps of: firstly, reading the STL triangular network model from an STL file into an internal storage, and establishing complete topological information of a surface patch, a side and a peak in the STL model based on an improved wing-edge structure; secondly, repeatedly searching through information in the internal storage to obtain a highest position surface patch serving as a seed surface patch in an original STL model, and searching an adjacent surface patch having the same normal vector Z-axis component symbol as the seed surface patch with a boundary expansion method on the basis to obtain a plurality of sub-STL models having the same normal vector Z-axis component symbol; and lastly, checking the boundary of each sub-STL model, recognizing and extracting covered boundary lines, and segmenting the sub-STL model by using a vertical plane defined by the covered boundary lines to further generate non-interfered sub-STL models. By adopting the three-dimensional segmenting method, three-dimensional segmentation of the STL triangular network model can be realized effectively; and moreover, the triangular network model has the advantages of high adaptability, high efficiency and low resource consumption.

Description

technical field [0001] The invention belongs to the technical field of rapid prototyping, and relates to a three-dimensional segmentation method of an STL triangular mesh model. Background technique [0002] The rapid prototyping process that uses layered and discrete methods for stacking manufacturing has inevitable principle errors, mainly including defects such as step effects that affect the accuracy of parts, low strength of parts, and low molding efficiency. Decomposed Injection Sculpturing (DIS) is a rapid prototyping process based on three-dimensional discrete, accumulation and removal, which can effectively overcome the above defects by combining the advantages of accumulation manufacturing and CNC machining. The STL triangular mesh model has become the quasi-industrial standard in the field of rapid prototyping. The three-dimensional segmentation of the STL triangular mesh model is one of the key technologies for developing DIS data processing software and realizin...

AI Technical Summary

Problems solved by technology

[0004] To sum up, it is necessary to propose a new technical solution for the problems of high resource occupation, low efficiency, and poor adaptability of geometric shapes in the existing 3D segmentation method of STL triangular mesh model.

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