| StepFun Step1X-3D integration notice |
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| Portions of the geometry flow transformer, shape-VAE decoder, image |
| conditioning, image framing, sampling loop, and surface-extraction mapping in |
| this family are modified from: |
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| stepfun-ai/Step1X-3D |
| https://github.com/stepfun-ai/Step1X-3D |
| revision cb5ac944709c6c913109070c7b90c3447f57f3d4 |
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| Those portions are provided under the accompanying Apache License 2.0 |
| (LICENSE-APACHE-2.0). Copyright (c) StepFun. All ported source files carry a |
| prominent modification notice. Independently written diffusers-3d package glue |
| remains under the package Apache-2.0 license. |
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| The texture stage's attention processors, multi-view loop, and conversion |
| are modified from Step1X-3D's step1x3d_texture (Apache-2.0), which adapts |
| MV-Adapter (https://github.com/huanngzh/MV-Adapter, Apache-2.0). Its latent |
| texture synchronisation is modified from Step1X-3D's texture_sync, which |
| derives from SyncMVD (https://github.com/LIU-Yuxin/SyncMVD); those portions |
| are provided under the accompanying MIT License (LICENSE-MIT), Copyright (c) |
| 2023 LIU-Yuxin. The CuPy Voronoi solver in texture_sync carries no license |
| and is not used. |
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| Step1X-3D's shape VAE descends from Michelangelo |
| (https://github.com/NeuralCarver/Michelangelo, GPL-3.0), whose perceiver |
| attention layers in turn follow OpenAI Shap-E (MIT). Step1X-3D distributes its |
| version without a GPL notice under Apache-2.0; this family re-implements the |
| decoder on stock Diffusers blocks and copies no Michelangelo source. |
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| Not included: upstream files carrying the Tencent Hunyuan 3D non-commercial |
| license header (step1x3d_geometry/models/autoencoders/volume_decoders.py and |
| the texture-stage custom_rasterizer and differentiable_renderer). Occupancy is |
| evaluated on a dense grid written for this package instead of upstream's |
| hierarchical volume decoder. pymeshlab (GPL) post-processing is not used. |
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| The converted weights come from https://huggingface.co/stepfun-ai/Step1X-3D |
| (Apache-2.0; layout checked at revision |
| bf7084495b3a72222f36549b7942948aa4d9daa7). The visual encoder weights are a |
| DINOv2-with-registers ViT-L/14 (facebook/dinov2-with-registers-large, |
| Apache-2.0). The texture converter combines the release's adapter weights |
| (Step1X-3D-Texture, Apache-2.0) with stabilityai/stable-diffusion-xl-base-1.0 |
| (CreativeML Open RAIL++-M License) and madebyollin/sdxl-vae-fp16-fix (MIT). |
| Model weights keep their own licenses. |
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| No affiliation, sponsorship, or endorsement by StepFun, Meta, Tencent, |
| OpenAI, or Stability AI is claimed. |
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