---
title: "Step1X-3D: workflow fit, costs and terms"
description: "Local prop prototypes with separate geometry and texture stages"
language: en
canonical: https://bestadultgames.io/en/developers/models/step1x-3d
---

[Developers](https://bestadultgames.io/en/developers.md) / [3D models](https://bestadultgames.io/en/developers/models?category=3d)

model · Documentation reviewed · 5 October 2026

B

# Step1X-3D

Local prop prototypes with separate geometry and texture stages

- **Availability**: available
- **Where it runs**: local
- **Costs**: No Step1X-3D code fee; GPU compute and cleanup. Commercial use needs dependency clearance; hosted access and billing are unverified.
- **Adult content policy**: conditional

Step1X-3D takes an image through separate geometry and texture stages, using geometric conditioning and synchronization to improve consistency between views. That makes it a useful local candidate for prop prototypes, with a mesh you can inspect before texturing. The demanding CUDA setup is only part of the commitment: its default texture workflow includes a noncommercial rendering dependency. Resolve that restriction before planning production around it. A watertight shape still needs topology that bends properly under a character rig; polished textures cannot fix that. Start with a prop whose silhouette and materials you can judge, then check the exported GLB in your engine. Character anatomy and cleanup effort remain untested here.

## Commercial use & license

Project code is Apache-2.0, and the checkpoint card declares the same license. The texture stack also loads SDXL under Open RAIL++-M. Its nvdiffrast library permits users outside NVIDIA and its affiliates to use it only for noncommercial research or evaluation. Copied Hunyuan renderer files retain conflicting noncommercial/community notices; Tencent's current 2.0 license excludes the EU, UK and South Korea. Resolve these component terms before commercial use or distribution.

## Adult content rules

SDXL prohibits unlawful use, exploiting or harming minors, and harassment. Copied Hunyuan components have separate territorial and social-ethics restrictions. Apache-2.0 grants no rights to reference images or people's likenesses, and this mixed stack has no blanket adult-use clearance. Hosted policies are unverified.

[Read the policy](https://github.com/stepfun-ai/Step1X-3D/blob/main/LICENSE)

## What you need

The documented environment uses Python 3.10, CUDA 12.4 and PyTorch 2.5.1, plus compiled rendering extensions. The repository reports 27 GB GPU memory for standard geometry plus texture, and 29 GB for label geometry plus texture; these are example usages, not verified minimums.

Ranks are recommendations for the task described, based on reviewed documentation. Model ranks cover non-explicit development work. We have not run practical benchmarks. Check content policies and commercial terms separately. [How the ranks work](https://bestadultgames.io/en/developers/methodology.md)

### Sources & further reading

- [Step1X-3D official repository](https://github.com/stepfun-ai/Step1X-3D)
- [Step1X-3D model card](https://huggingface.co/stepfun-ai/Step1X-3D)
- [nvdiffrast dependency license](https://github.com/NVlabs/nvdiffrast/blob/main/LICENSE.txt)
- [SDXL base checkpoint license](https://huggingface.co/stabilityai/stable-diffusion-xl-base-1.0/blob/main/LICENSE.md)
- [Copied Hunyuan renderer notices](https://github.com/stepfun-ai/Step1X-3D/blob/main/step1x3d_texture/differentiable_renderer/mesh_render.py)
- [Current Hunyuan3D-2 upstream license](https://github.com/Tencent-Hunyuan/Hunyuan3D-2/blob/main/LICENSE)

Last checked 5 October 2026.

## Why consider it

- Separate image-to-mesh and mesh-texturing stages
- Published inference and training code for both stages
- Documented GLB export for textured and untextured meshes

## Tradeoffs to plan for

- Demanding CUDA setup with compiled rendering components
- Watertight geometry does not guarantee topology that deforms well
- Default texture renderer has a noncommercial use restriction

The tier reflects documented fit for the workflow described here and availability. No numeric score or hands-on performance results are provided.

[Compare with other models](https://bestadultgames.io/en/developers/compare?model=step1x-3d)

## Related guides

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Read the guide → B reading priority

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### [Keep 3D characters consistent and choose generation or Blender authoring](https://bestadultgames.io/en/developers/guides/consistent-3d-characters.md)

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