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Next3D: Generative Neural Texture Rasterization for 3D-Aware Head Avatars

Next3D: Generative Neural Texture Rasterization for 3D-Aware Head Avatars
Jingxiang Sun, Xuan Wang, Lizhen Wang, Xiaoyu Li, Yong Zhang, Hongwen Zhang, Yebin Liu

Project | Paper | Twitter

Abstract: 3D-aware generative adversarial networks (GANs) synthesize high-fidelity and multi-view-consistent facial images using only collections of single-view 2D imagery. Towards fine-grained control over facial attributes, recent efforts incorporate 3D Morphable Face Model (3DMM) to describe deformation in generative radiance fields either explicitly or implicitly. Explicit methods provide fine-grained expression control but cannot handle topological changes caused by hair and accessories, while implicit ones can model varied topologies but have limited generalization caused by the unconstrained deformation fields. We propose a novel 3D GAN framework for unsupervised learning of generative, high-quality and 3D-consistent facial avatars from unstructured 2D images. To achieve both deformation accuracy and topological flexibility, we propose a 3D representation called Generative Texture-Rasterized Tri-planes. The proposed representation learns Generative Neural Textures on top of parametric mesh templates and then projects them into three orthogonal-viewed feature planes through rasterization, forming a tri-plane feature representation for volume rendering. In this way, we combine both fine-grained expression control of mesh-guided explicit deformation and the flexibility of implicit volumetric representation. We further propose specific modules for modeling mouth interior which is not taken into account by 3DMM. Our method demonstrates state-of-the-art 3D-aware synthesis quality and animation ability through extensive experiments. Furthermore, serving as 3D prior, our animatable 3D repre- sentation boosts multiple applications including one-shot facial avatars and 3D-aware stylization.

Requirements

1–8 high-end NVIDIA GPUs. We have done all testing and development using V100, RTX3090, and A100 GPUs.
64-bit Python 3.9 and PyTorch 1.12.0 (or later). See https://pytorch.org for PyTorch install instructions.
CUDA toolkit 11.3 or later.
Python libraries: see environment.yml for exact library dependencies. You can use the following commands with Miniconda3 to create and activate your Python environment:
- cd Next3D
- conda env create -f environment.yml
- conda activate next3d

Getting started

Download our pretrained models following the link and put it under pretrained_models. For training Next3D on the top of EG3D, please also download the pretrained checkpoint ffhqrebalanced512-64.pkl of EG3D.

Generating media

# Generate videos for the shown cases using pre-trained model

python gen_videos_next3d.py --outdir=out --trunc=0.7 --seeds=10720,12374,13393,17099 --grid=2x2 \
    --network=pretrained_models/next3d_ffhq_512.pkl --obj_path=data/demo/demo.obj \
    --lms_path=data/demo/demo_kpt2d.txt --lms_cond=True

# Generate images and shapes (as .mrc files) for the shown cases using pre-trained model

python gen_samples.py --outdir=out --trunc=0.7 --shapes=true --seeds=166 \
    --network=pretrained_models/next3d_ffhq_512.pkl --obj_path=data/demo/demo.obj \
    --lms_path=data/demo/demo_kpt2d.txt --lms_cond=True

We visualize our .mrc shape files with UCSF Chimerax. Please refer to EG3D for more detailed instructions.

Reenacting generative avatars

Installation

Ensure the Deep3DFaceRecon_pytorch submodule is properly initialized

git submodule update --init --recursive

Download the pretrained models for FLAME estimation following DECA and put them into dataset_preprocessing/ffhq/deca/data; download the pretrained models for gaze estimation through the link and put them into dataset_preprocessing/ffhq/faceverse/data.

Preparing datasets

The video reenactment input contains three parts: camera poses dataset.json, FLAME meshes ('.obj') and 2D landmark files ('.txt'). For quick start, you can download the processed talking video of President Obama here and place the downloaded folder as data/obama. You can also preprocess your custom datasets by running the following commands:

cd dataset_preprocessing/ffhq
python preprocess_in_the_wild.py --indir=INPUT_IMAGE_FOLDER

You will obtain FLAME meshes and 2D landmark files for frames and a 'dataset.json'. Please put all these driving files into a same folder for reenactment later.

Reenacting samples

python reenact_avatar_next3d.py --drive_root=data/obama \
  --network=pretrained_models/next3d_ffhq_512.pkl \
  --grid=2x1 --seeds=166 --outdir=out --fname=reenact.mp4 \
  --trunc=0.7 --lms_cond=1

Training

Download and process Flickr-Faces-HQ dataset using the following commands.

cd dataset_preprocessing/ffhq
python runme.py

You can perform FLAME and landmarks estimation referring to preprocess_in_the_wild.py. We will also integrate all the preprocessing steps into a script soon. The dataset should be organized as below:

    ├── /path/to/dataset
    │   ├── meshes512x512
    │   ├── lms512x512
    │   ├── images512x512
    │   │   ├── 00000
                ├──img00000000.png
    │   │   ├── ...
    │   │   ├── dataset.json

You can train new networks using train_next3d.py. For example:

# Train with FFHQ on the top of EG3D with raw neural rendering resolution=64, using 8 GPUs.
python train_next3d.py --outdir=~/training-runs --cfg=ffhq --data=data/ffhq/images512x512 \
  --rdata data/ffhq/meshes512x512 --gpus=8 --batch=32 --gamma=4 --topology_path=data/demo/head_template.obj \
  --gen_pose_cond=True --gen_exp_cond=True --disc_c_noise=1 --load_lms=True --model_version=next3d \
  --resume pretrained_models/ffhqrebalanced512-64.pkl

Note that rendering-conditioned discriminator is not supported currently because obtaining rendering is still time-consuming. We are trying to accelerate this process and the training code will keep updating.

One-shot portrait reenactment and stylization

Code will come soon.

Citation

@inproceedings{sun2023next3d,
  author = {Sun, Jingxiang and Wang, Xuan and Wang, Lizhen and Li, Xiaoyu and Zhang, Yong and Zhang, Hongwen and Liu, Yebin},
  title = {Next3D: Generative Neural Texture Rasterization for 3D-Aware Head Avatars},
  booktitle = {CVPR},
  year = {2023}
}