Hunyuan3D 2.1 – Advanced 3D Asset Generation Model

What is Hunyuan3D 2.1?

Hunyuan3D 2.1 is an open-source generative AI model for converting 2D images into high-fidelity 3D assets. It combines two specialized modules—Hunyuan3D-Shape for precise image-to-mesh reconstruction and Hunyuan3D-Paint for physically based rendering (PBR) texture synthesis. Designed to run on MacOS, Windows, and Linux, Hunyuan3D 2.1 supports full fine-tuning and customization. Developers and 3D artists benefit from photorealistic outputs with accurate reflections, subsurface scattering, and metalness effects, outpacing many closed-source and research models.

Key Features

• Image-to-Shape Conversion: Automatically generate clean, watertight meshes from input images.
• PBR Texture Synthesis: Realistic material maps (albedo, roughness, normal) with advanced light interaction.
• Fully Open Source: Includes pretrained weights, training scripts, and extensibility for custom datasets.
• Cross-Platform Support: Native compatibility with MacOS, Windows, and Linux command-line workflows.
• High Detail Control: Adjustable num_chunks (1,000–200,000) and max_facenum (10,000–200,000) for mesh complexity.
• Tunable Guidance: guidance_scale (1–20) balances adherence to input vs. creative variation.

Best Use Cases

• Game Development: Rapidly generate production-ready 3D props and environment assets with PBR textures.
• AR/VR Prototyping: Turn real-world product photos into interactive 3D models for immersive demos.
• E-commerce: Create photorealistic 3D previews of merchandise from catalog images.
• Film & Animation: Prototype detailed 3D characters or objects with fine control over mesh resolution and texture realism.
• 3D Printing: Export optimized meshes for physical prototyping and small-batch manufacturing.

Prompt Tips and Output Quality

To maximize output quality and consistency:

• Seed: Use seed=42 for reproducible results or random for exploration.
• Inference Steps: Set steps=30 (range 5–50) for a balance of speed and fidelity.
• Mesh Detail: Increase num_chunks to 8,000+ and max_facenum to 20,000+ for detailed surfaces.
• Texture Generation: Enable generate_texture=true and choose octree_resolution=512 for higher texture resolution.
• Background Removal: Toggle remove_background=true to isolate objects cleanly.
• Guidance Scale: A default guidance_scale=7.5 preserves input likeness; increase to 10 for creative variations.

FAQs

Q: How do I convert a product image to a 3D model?
A: Pass your image URL to the image parameter and run Hunyuan3D-Shape. Adjust steps and max_facenum to refine mesh fidelity.

Q: Can I fine-tune Hunyuan3D 2.1 on my own dataset?
A: Yes. The repository includes training scripts and weight checkpoints. You can fine-tune on domain-specific images.

Q: What file formats are supported for export?
A: Generated meshes export as OBJ or glTF, with PBR textures in PNG or JPEG maps.

Q: Is Hunyuan3D 2.1 suitable for real-time applications?
A: For real-time, reduce steps and num_chunks settings, then optimize output in your engine’s LOD pipeline.

Q: Where can I get the code and weights?
A: Visit the official GitHub repository under an open-source license for full access and community contributions.