Step1X-3D: Towards High-Fidelity and Controllable Generation of Textured 3D Assets

TL;DR

Step1X-3D introduces an open framework for high-fidelity, controllable textured 3D asset generation, combining a large curated dataset, a hybrid architecture, and open-source tools to advance 3D generative AI.

Contribution

It presents a comprehensive pipeline with a new dataset, a hybrid VAE-DiT and diffusion architecture, and open-source release, addressing key challenges in 3D generative AI.

Findings

Achieves state-of-the-art performance on 3D generation benchmarks.

Supports direct transfer of 2D control techniques to 3D synthesis.

Demonstrates high-quality, controllable textured 3D asset generation.

Abstract

While generative artificial intelligence has advanced significantly across text, image, audio, and video domains, 3D generation remains comparatively underdeveloped due to fundamental challenges such as data scarcity, algorithmic limitations, and ecosystem fragmentation. To this end, we present Step1X-3D, an open framework addressing these challenges through: (1) a rigorous data curation pipeline processing >5M assets to create a 2M high-quality dataset with standardized geometric and textural properties; (2) a two-stage 3D-native architecture combining a hybrid VAE-DiT geometry generator with an diffusion-based texture synthesis module; and (3) the full open-source release of models, training code, and adaptation modules. For geometry generation, the hybrid VAE-DiT component produces TSDF representations by employing perceiver-based latent encoding with sharp edge sampling for detail preservation. The diffusion-based texture synthesis module then ensures cross-view consistency through geometric conditioning and latent-space synchronization. Benchmark results demonstrate state-of-the-art performance that exceeds existing open-source methods, while also achieving competitive quality with proprietary solutions. Notably, the framework uniquely bridges the 2D and 3D generation paradigms by supporting direct transfer of 2D control techniques~(e.g., LoRA) to 3D synthesis. By simultaneously advancing data quality, algorithmic fidelity, and reproducibility, Step1X-3D aims to establish new standards for open research in controllable 3D asset generation.