UltraShape is an open-source AI model for generating high-fidelity 3D shapes using a scalable diffusion framework with coarse-to-fine refinement.

Is UltraShape free to use?

Yes, it is completely free and open-source, with pre-trained models and code available on GitHub and Hugging Face under Apache 2.0 license.

How does UltraShape generate 3D models?

It uses a two-stage process: first synthesizing a coarse global structure, then refining it with voxel-based details using positional anchors for high-quality geometry.

Can UltraShape generate textured 3D models?

The core model focuses on high-fidelity geometry (meshes); texturing requires additional passes or integration with other tools.

UltraShape

Scalable AI Framework for High-Fidelity 3D Shape Generation

From PKU YuanGroup

Founder: Tanghui Jia et al.

Video & Animation

24 Dec 2025

10K+

Free

Pricing Model

Free

Starting Price

$0/Month

About This AI

UltraShape is an open-source 3D diffusion model that generates high-fidelity 3D geometry through a two-stage coarse-to-fine refinement process.

Trained on public datasets, it features advanced data curation for watertight meshes, voxel-based refinement with RoPE encoding, and excellent test-time scalability for detailed outputs, making it competitive with state-of-the-art methods using limited resources.

Image To Video Text To Video Video Generator

Pricing

Pricing Model

Free

Starting Price

$0/Month

Key Features

Two-stage diffusion pipeline for coarse structure and fine geometric refinement
Advanced data processing for watertight, high-quality 3D meshes
Voxel-based refinement with RoPE-encoded positional anchors
Excellent scalability to higher resolutions at inference time
Open-source code, pre-trained models, and inference support

Pros

Achieves high-fidelity 3D geometry with public datasets only
Competitive performance against commercial and open-source models
Fully open-source with released code and weights
Strong test-time scalability for detailed outputs
Efficient resource usage compared to larger models

Cons

Requires technical setup and GPU for local inference
Geometry-only generation without built-in texturing
No hosted web demo for instant use
Dependent on third-party integrations like ComfyUI or fal.ai

UltraShape is an impressive open-source tool for researchers and developers needing high-quality 3D shape generation, offering scalable, detailed geometry creation ideal for asset production in games, VR, and design.

FAQs

What is UltraShape?
UltraShape is an open-source AI model for generating high-fidelity 3D shapes using a scalable diffusion framework with coarse-to-fine refinement.
Is UltraShape free to use?
Yes, it is completely free and open-source, with pre-trained models and code available on GitHub and Hugging Face under Apache 2.0 license.
How does UltraShape generate 3D models?
It uses a two-stage process: first synthesizing a coarse global structure, then refining it with voxel-based details using positional anchors for high-quality geometry.
Can UltraShape generate textured 3D models?
The core model focuses on high-fidelity geometry (meshes); texturing requires additional passes or integration with other tools.