hrvatski

Computer-Aided Detection of Exact Reflection and Axisymmetry in B-rep CAD Models

During Computer-Aided Design (CAD), there is often the need to check if symmetrically designed 3D CAD models indeed exhibit the intended type of symmetry. However, the symmetry information is seldom directly stored in the native CAD models and never in the neutral exchange file formats. One way to retrieve the symmetry information is the visual recognition by the expert. However, for complex geometric shapes or a significant number of CAD models from the repository, the visual recognition may be complex, time-intensive, and often only approximative. Thus, to eliminate the need for visual recognition, computer-aided symmetry detection is preferred, which deals with the automatic identification of the planes and axes of symmetry. The present study proposes a vector-based approach using face centroids to detect exact reflection and axisymmetry in 3D CAD models with Boundary Representation (B-rep). The proposed approach has been implemented in a state-of-the-art CAD system using its Application Programming Interface and tested on 150 CAD models for validation purposes. The obtained results confirmed that the proposed approach enables accurate and efficient detection of the corresponding planes and axes of symmetry.

symmetry detection ; exact symmetry ; axisymmetry ; reflection symmetry ; Computer-Aided Design (CAD) ; B-rep

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