Automatic analysis method and system for inter-entity contact relationship based on b-rep boundary representation

By using the B-Rep boundary representation method, the high-precision geometric information of the CAD system is directly utilized to identify and calculate the contact relationships between entities in the 3D model. This solves the problems of insufficient accuracy and low automation in existing technologies, and realizes efficient and accurate contact relationship analysis and cross-platform data transfer.

CN122197131APending Publication Date: 2026-06-12NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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Patent Information

Authority / Receiving Office
CN Ā· China
Patent Type
Applications(China)
Current Assignee / Owner
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
Filing Date
2026-02-13
Publication Date
2026-06-12

AI Technical Summary

Technical Problem

Existing technologies lack sufficient accuracy in identifying contact relationships between entities in 3D digital models, have limited information dimensions in analysis results, low automation, bottlenecks in computational efficiency, and are difficult to apply across platforms. Furthermore, the geotechnical engineering modeling process is fragmented and suffers from poor geometric consistency.

Method used

A B-Rep-based boundary representation method is adopted to acquire boundary representation data of 3D scene, construct spatial index structure, identify potential contact entity pairs, perform face-to-face geometric intersection determination, calculate contact area, construct contact relationship network, and output structured results.

Benefits of technology

It improves the accuracy and automation of contact relationships, reduces computational complexity, enables seamless data transfer across platforms, supports advanced applications such as physical simulation and quantity surveying, and simplifies the modeling process for geotechnical engineering.

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Abstract

The application discloses a kind of based on B-Rep boundary representation inter-entity contact relationship automatic analysis method and system, it is related to computer and building information model cross technical field, comprising: obtaining the boundary representation data of multiple entities in scene;Based on the boundary representation data is constructed for all entities Spatial index structure;Utilize spatial index structure to identify the candidate entity pair set that needs to be carried out accurate contact analysis;To each pair of entities in candidate entity pair set, traverse its respective B-Rep face piece, execute face-face geometric intersection determination, and calculate contact area;All contact relationship exists entity pair and its corresponding contact area information are summarized, contact relationship network is constructed, and structured contact relationship output result is generated.The application carries out face-face geometric intersection determination using the geometry and topological properties of CAD system kernel, and then improves the accuracy of contact area, contact surface direction and other results, fundamentally solves the precision loss problem caused by geometric discretization in existing method.
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