BRep to Graph CAD Model Analysis for Parametric Editing
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Solution Overview
Problem
Existing CAD model analysis methods struggle with parametric editing due to the loss of historical information in BRep representations, making it difficult to predict and reconstruct the model building process.
Innovation Solution
A CAD model analysis method that transforms CAD models from BRep representation into a graph structure, using an analytical model with an encoder and decoder to deduce a feature modeling-based model building process, including modeling feature types and parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If BRep representation is used to describe CAD model, then geometric structure and topological information can be described, but historical information for building the model is lost
Solution Approach 1:
The patent segments the CAD model representation into multiple components: BRep representation for geometric structure, graph structure for topological relationships, and a learned historical information component for building process. This segmentation allows each component to handle specific aspects without overwhelming complexity.
Solution Approach 2:
The patent introduces an intermediary graph structure that mediates between the BRep representation and the historical information. The graph structure serves as a bridge, connecting geometric data with topological relationships, enabling the recovery of historical information without directly complicating the BRep representation.
2Ease of manufacture
If extrusion based on existing face is adopted to reduce training difficulty, then model building process can be predicted, but parametric editing becomes difficult
Solution Approach 1:
The patent employs dynamic graph structures that can adapt and transform during the modeling process. The graph structure dynamically updates to reflect the current state of the CAD model, enabling both easy training through structured data and flexible parametric editing through reversible transformations.
Solution Approach 2:
The patent utilizes parameter changes in the graph structure to enable parametric editing. By representing the model building process as a sequence of parameter transformations on the graph, the system allows easy modification of parameters while maintaining the structural relationships, thus achieving both training efficiency and editing flexibility.
Data Source
AI summary
The present application provides a CAD model analysis method and apparatus, a device and a storage medium, which relates to the technical field of industrial manufacturing. The CAD model based on a BRep representation is transformed into a graph structure. The graph structure is input into an analytical model to obtain a modeling sequence of the CAD model. By transforming the CAD model with a BRep representation into the graph structure, the analytical model learns the modeling feature in the graph structure, and the modeling feature type and the feature parameter are obtained, so as to enable the prediction of the model building process of the CAD model and facilitate to subsequently make parametric re-editing of the CAD model