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A conversion method between non-manifold cad software based on boundary representation

A technology of boundary representation and conversion method, which is applied in the field of conversion between non-manifold CAD software, and can solve problems such as inability to complete conversion.

Active Publication Date: 2022-04-22
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For the non-manifold solid model, the special file interface and the neutral file interface can satisfy the conversion, but the conversion method of the non-manifold solid model based on the BRep interface cannot complete the conversion

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  • A conversion method between non-manifold cad software based on boundary representation
  • A conversion method between non-manifold cad software based on boundary representation
  • A conversion method between non-manifold cad software based on boundary representation

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Embodiment Construction

[0032] The structure of the non-manifold model is used to construct the Body of Parasolid, and the Body in Barasolid is divided into four types, as shown in the following table:

[0033] Body describe Minimum_body isolated point Wire_body A set of connected edges, with no more than 2 edges connected by any vertex Sheet_body A set of connected faces where each edge connects at most two faces Solid_body a solid region (e.g. a cube)

[0034] OpenCascade's topology model tree such as figure 2 As shown in the left view, Compound (mixed) is a combination of any type of Compsolid, Solid, Shell, Face, Wire, Edge, and Vertex; Compsolid is a combination of a group of Solid (stereo) entity types, and Solid topological entities represent three-dimensional closures The geometric entity itself, the boundary of Solid is expressed by one or more Shell (shell) topological entities, the boundary of Shell is expressed by one or more Face (surface) top...

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Abstract

This application discloses a conversion method between non-manifold CAD software based on boundary representation, including: constructing the isolated point in the OpenCascade model into the Minimumbody corresponding to the Parasolid model; constructing the hanging edge in the OpenCascade model into the corresponding Parasolid model The Wire_body of the OpenCascade model; construct the Sheet_body corresponding to the Parasolid model in the OpenCascade model, and associate the constructed Sheet_body with the corresponding geometric data and topology data in the Parasolid model; construct the geometric entity in the OpenCascade model into the Solid_body corresponding to the Parasolid model, and The constructed Solid_body associates the corresponding geometric data and topology data in the Parasolid model; repeat the above steps until all structures in the non-popular model are converted. This application directly extracts the boundary expression BRep of OpenCascade and Parasolid geometric core, and then establishes the mapping relationship between BRep, so as to complete the data conversion between CAD systems, making the conversion between software more adaptable and relatively more stable.

Description

technical field [0001] The present application relates to the technical field of file conversion, in particular to a conversion method between non-manifold CAD software based on boundary representation. Background technique [0002] The traditional methods to solve the information exchange between CAD software adopt the method of special file interface, neutral file interface and interface method based on BRep (Boundary Representation, boundary representation). The method of special file interface refers to the development of a file interface for mutual conversion of data formats between two different CAD software. The neutral file interface method refers to information exchange through several recognized intermediate file formats. Typical neutral files include IGES neutral files supported by most software, STEP neutral files adopted by the International Organization for Standardization, etc. The method based on the BRep interface refers to using the boundary expression BRe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F8/51
CPCG06F8/51
Inventor 刘海涛黄运保李海艳
Owner GUANGDONG UNIV OF TECH