Official code release for the paper:
BrepDiff: Single-stage B-rep Diffusion Model
SIGGRAPH 2025
Mingi Lee^*, Dongsu Zhang^*, Clément Jambon^*, Young Min Kim
^* Equal contribution

[Project page] · [Paper] · [Visualization Tool]

BrepDiff is a diffusion-based generative model for 3D Boundary Representations (B-reps). It enables:

• Single-stage generation of valid and diverse CAD models
• Direct editing operations such as shape completion, merging, and interpolation
• Efficient generation, avoiding the complexity and limitations of cascaded pipelines

This repository provides code for training, evaluation, and editing with BrepDiff.

• 🛠 Installation
• 🏋️ Training
• 🎲 Evaluation on Unconditional Generation
• ✏️ Editing B-reps

If you find this work useful, please consider citing:

@inproceedings{lee2025brepdiff,
    author = {Lee, Mingi and Zhang, Dongsu and Jambon, Cl\'{e}ment and Kim, Young Min},
    title = {BrepDiff: Single-Stage B-rep Diffusion Model},
    year = {2025},
    isbn = {9798400715402},
    publisher = {Association for Computing Machinery},
    address = {New York, NY, USA},
    url = {https://doi.org/10.1145/3721238.3730698},
    doi = {10.1145/3721238.3730698},
    booktitle = {Proceedings of the Special Interest Group on Computer Graphics and Interactive Techniques Conference Conference Papers},
    articleno = {103},
    numpages = {11},
    keywords = {Boundary representation, Generative model, Diffusion Model},
    location = {Vancouver, BC, Canada},
    series = {SIGGRAPH Conference Papers '25}
}

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You are free to use, modify, and distribute this work, including for commercial purposes, provided that you give appropriate credit.