---
license: mit
pipeline_tag: image-to-3d
---

# Gen-3Diffusion: Realistic Image-to-3D Generation via 2D & 3D Diffusion Synergy

This repository contains the `Gen-3Diffusion` model, which achieves realistic image-to-3D generation by leveraging a pre-trained 2D diffusion model and a 3D diffusion model, as presented in the paper:
[**Gen-3Diffusion: Realistic Image-to-3D Generation via 2D & 3D Diffusion Synergy**](https://huggingface.co/papers/2412.06698)

Project Page: [https://yuxuan-xue.com/gen-3diffusion](https://yuxuan-xue.com/gen-3diffusion)
Code: [https://github.com/YuxuanSnow/Gen3Diffusion](https://github.com/YuxuanSnow/Gen3Diffusion)

![](https://github.com/YuxuanSnow/Gen3Diffusion/blob/main/assets/teaser_video.gif)

## Key Insight :raised_hands:
- 2D foundation models are powerful but output lacks 3D consistency!
- 3D generative models can reconstruct 3D representation but is poor in generalization!
- How to combine 2D foundation models with 3D generative models?:
  - they are both diffusion-based generative models => **Can be synchronized at each diffusion step**
  - 2D foundation model helps 3D generation => **provides strong prior informations about 3D shape**
  - 3D representation guides 2D diffusion sampling => **use rendered output from 3D reconstruction for reverse sampling, where 3D consistency is guaranteed**

## Install
Same Conda environment to Human-3Diffusion. Please skip if you already installed it.
```bash
# Conda environment
conda create -n gen3diffusion python=3.10
conda activate gen3diffusion
pip install torch==2.1.0 torchvision==0.16.0 torchaudio==2.1.0 --index-url https://download.pytorch.org/whl/cu121
pip install xformers==0.0.22.post4 --index-url https://download.pytorch.org/whl/cu121

# Gaussian Opacity Fields
git clone https://github.com/YuxuanSnow/gaussian-opacity-fields.git
cd gaussian-opacity-fields && pip install submodules/diff-gaussian-rasterization
pip install submodules/simple-knn/ && cd ..
export CPATH=/usr/local/cuda-12.1/targets/x86_64-linux/include:$CPATH

# Dependencies
pip install -r requirements.txt

# TSDF Fusion (Mesh extraction) Dependencies
pip install --user numpy opencv-python scikit-image numba
pip install --user pycuda
pip install scipy==1.11
```

## Pretrained Weights
Our pretrained weight can be downloaded from huggingface.
```bash
mkdir checkpoints_obj && cd checkpoints_obj
wget https://huggingface.co/yuxuanx/gen3diffusion/resolve/main/model.safetensors
wget https://huggingface.co/yuxuanx/gen3diffusion/resolve/main/model_1.safetensors
wget https://huggingface.co/yuxuanx/gen3diffusion/resolve/main/pifuhd.pt
cd ..
```
The avatar reconstruction module is same to Human-3Diffusion. Please skip if you already installed Human-3Diffusion.
```bash
mkdir checkpoints_avatar && cd checkpoints_avatar
wget https://huggingface.co/yuxuanx/human3diffusion/resolve/main/model.safetensors
wget https://huggingface.co/yuxuanx/human3diffusion/resolve/main/model_1.safetensors
wget https://huggingface.co/yuxuanx/human3diffusion/resolve/main/pifuhd.pt
cd ..
```

## Inference
```bash
# given one image of object, generate 3D-GS object
# subject should be centered in a square image, please crop properly 
# recenter plays a huge role in object reconstruction. Please adjust the recentering if the reconstruction doesn't work well
python infer.py --test_imgs test_imgs_obj --output output_obj --checkpoints checkpoints_obj

# given generated 3D-GS, perform TSDF mesh extraction
python infer_mesh.py --test_imgs test_imgs_obj --output output_obj --checkpoints checkpoints_obj --mesh_quality high
```

```bash 
# given one image of human, generate 3D-GS avatar
# subject should be centered in a square image, please crop properly
python infer.py --test_imgs test_imgs_avatar --output output_avatar --checkpoints checkpoints_avatar

# given generated 3D-GS, perform TSDF mesh extraction
python infer_mesh.py --test_imgs test_imgs_avatar --output output_avatar --checkpoints checkpoints_avatar --mesh_quality high
```

## Citation :writing_hand:
```bibtex
@inproceedings{xue2024gen3diffusion,
  title     = {{Gen-3Diffusion: Realistic Image-to-3D Generation via 2D & 3D Diffusion Synergy }},
  author    = {Xue, Yuxuan and Xie, Xianghui and Marin, Riccardo and Pons-Moll, Gerard.},\
  journal   = {Arxiv},\
  year      = {2024},\
}
```