What is Step1X-3D
Step1X-3D is a high-fidelity, controllable 3D asset generation framework launched by StepFun in collaboration with LightIllusions. Based on a rigorous data curation pipeline, 2 million high-quality data points were selected from over 5 million 3D assets, creating standardized datasets of geometric and texture attributes. Step1X-3D supports multimodal conditional inputs, such as text and semantic labels, and achieves flexible geometric control based on Low-Rank Adaptation (LoRA) fine-tuning. Step1X-3D advances the development of 3D generation technology.
Main Features of Step1X-3D
- High-fidelity and controllable 3D asset generation: Generates 3D assets with high-fidelity geometry and diverse texture maps, maintaining excellent alignment between surface geometry and texture mapping.
- Support for multiple conditional inputs: Supports multiple conditional inputs, such as multi-view, bounding boxes, and skeletons, enabling more flexible 3D asset generation.
- Open-source: Provides open-source technical reports, inference code and model weights, and training code.
Technical Principles of Step1X-3D
- Data curation: Based on multi-dimensional filtering criteria, high-quality 3D assets are precisely selected; winding number technology is used to improve the success rate of mesh-to-SDF conversion, ensuring the accuracy of geometric supervision.
- Geometry generation: With the help of perceptron-based latent encoding and sharp-edge sampling strategies, high-fidelity TSDF representations are generated, and efficient diffusion model training is carried out based on a rectified flow transformer, ensuring the stability and efficiency of geometry generation.
- Texture generation: Using a pretrained multi-view image generation model as the foundation, combined with geometric guidance, multi-view consistent textures are generated; a texture space synchronization module is introduced to achieve latent space alignment, ensuring precise alignment of textures and geometry, and texture inpainting technology is used to handle artifacts in UV mapping, achieving seamless texture synthesis.
- Controllability: Based on LoRA fine-tuning technology, flexible geometric control is achieved, supporting control over symmetry, level of geometric detail, etc., and compatible with multimodal conditional inputs, enhancing the controllability and diversity of generation.
Project Links for Step1X-3D
- GitHub repository：https://github.com/stepfun-ai/Step1X-3D
- HuggingFace model library：https://huggingface.co/stepfun-ai/Step1X-3D
- arXiv technical paper：https://arxiv.org/pdf/2505.07747
- Online demo：https://huggingface.co/spaces/stepfun-ai/Step1X-3D
Application Scenarios of Step1X-3D
- Game development: Generates high-fidelity 3D models, rapidly creates prototypes, supports personalized content, and improves visual effects and player experience.
- Film and television production: Used for generating virtual scenes, characters, and special effects, accelerating the production process and improving visual quality.
- Virtual reality (VR) and augmented reality (AR): Creates immersive 3D environments and interactive content, enhancing user experience.
- Architectural design: Generates virtual architectural and interior design models, assists urban planning, and improves design presentation.
- Education and training: Builds virtual laboratories, historical and cultural heritage models, and skills training environments, providing intuitive and interactive learning experiences.