GenNBV: Generalizable Next-Best-View Policy for Active 3D Reconstruction

CVPR 2024
Xiao Chen  Quanyi Li  Tai Wang  Tianfan Xue  Jiangmiao Pang 
Shanghai AI Laboratory The Chinese University of Hong Kong

📋 Contents

1. About
2. Getting Started
3. Model and Benchmark
4. Citation
5. License

🏠 About

While recent advances in neural radiance field enable realistic digitization for large-scale scenes, the image-capturing process is still time-consuming and labor-intensive. Previous works attempt to automate this process using the Next-Best-View (NBV) policy for active 3D reconstruction. However, the existing NBV policies heavily rely on hand-crafted criteria, limited action space, or per-scene optimized representations. These constraints limit their cross-dataset generalizability. To overcome them, we propose GenNBV, an end-to-end generalizable NBV policy. Our policy adopts a reinforcement learning (RL)-based framework and extends typical limited action space to 5D free space. It empowers our agent drone to scan from any viewpoint, and even interact with unseen geometries during training. To boost the cross-dataset generalizability, we also propose a novel multi-source state embedding, including geometric, semantic, and action representations. We establish a benchmark using the Isaac Gym simulator with the Houses3K and OmniObject3D datasets to evaluate this NBV policy. Experiments demonstrate that our policy achieves a 98.26% and 97.12% coverage ratio on unseen building-scale objects from these datasets, respectively, outperforming prior solutions.

📚 Getting Started

Installation

We test our codes under the following environment:

• Ubuntu 20.04
• NVIDIA Driver: 545.29.02
• CUDA 11.7
• Python 3.8.12
• Torch 1.13.1+cu117

1. Clone this repository.

git clone https://github.com/zjwzcx/GenNBV
cd GenNBV

2. Create an environment and install PyTorch.

conda create -n gennbv python=3.8 -y
conda activate gennbv
pip install torch==1.13.1+cu117 torchvision==0.14.1+cu117 torchaudio==0.13.1 --extra-index-url https://download.pytorch.org/whl/cu117

3. NVIDIA Isaac Gym Installation: https://developer.nvidia.com/isaac-gym/download

cd isaacgym/python
pip install -e .

4. Install PyTorch3D.

# Version 0.7.8 works
git clone https://github.com/facebookresearch/pytorch3d.git
cd pytorch3d
pip install -e .

5. Install GenNBV.

pip install -r requirements.txt
pip install -e .

Data Preparation

We provide all the preprocessed data used in our work, including mesh files and ground-truth surface points. We recommend users download the data from our provided Google Drive link [HERE].

The directory structure should be as follows.

gennbv
├── gennbv
│   ├── env
│   ├── train
│   ├── ...
├── data_gennbv
│   ├── houses3k
│   │   ├── gt
│   │   ├── obj
│   │   ├── urdf
│   ├── omniobject3d
│   ├── ...

🕹️ Training & Evaluation

Weights & Bias (wandb) is highly recommended for analyzing the training logs. If you want to use wandb in our codebase, please paste your wandb API key into wandb_utils/wandb_api_key_file.txt. If you don't want to use wandb, please add --stop_wandb into the following command.

Training & Evaluation

Please run the following command to reproduce the standard training and evaluation of GenNBV (need ~25GB VRAM):

python gennbv/train/train_eval_gennbv.py --sim_device=cuda:0 --num_envs=256 --headless

Training-only (need <20GB VRAM):

python gennbv/train/train_gennbv.py --sim_device=cuda:0 --num_envs=256 --headless

Customized Training Environments

If you want to customize a novel training environment, you need to create your environment and configuration files in gennbv/env and then define the task in gennbv/__init__.py.

Pretrained Checkpoint

We also provide the pretrained checkpoints of GenNBV [HERE].

📝 TODO List

• [x] Release the paper and training code.
• [x] Release preprocessed dataset.
• [x] Release the evaluation scripts.
• [x] Release the pretrained checkpoint.

📦 Model and Benchmark

Model Overview

Benchmark Overview

🔗 Citation

If you find our work helpful, please cite it:

@inproceedings{chen2024gennbv,
  title={GenNBV: Generalizable Next-Best-View Policy for Active 3D Reconstruction},
  author={Chen, Xiao and Li, Quanyi and Wang, Tai and Xue, Tianfan and Pang, Jiangmiao},
  booktitle={2024 IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR)},
  pages={16436--16445},
  year={2024},
  organization={IEEE}
}

If you use the preprocessed dataset such as Houses3K and OmniObject3D, please cite them:

@inproceedings{peralta2020next,
  title={Next-best view policy for 3d reconstruction},
  author={Peralta, Daryl and Casimiro, Joel and Nilles, Aldrin Michael and Aguilar, Justine Aletta and Atienza, Rowel and Cajote, Rhandley},
  booktitle={Computer Vision--ECCV 2020 Workshops: Glasgow, UK, August 23--28, 2020, Proceedings, Part IV 16},
  pages={558--573},
  year={2020},
  organization={Springer}
}

@inproceedings{wu2023omniobject3d,
  title={Omniobject3d: Large-vocabulary 3d object dataset for realistic perception, reconstruction and generation},
  author={Wu, Tong and Zhang, Jiarui and Fu, Xiao and Wang, Yuxin and Ren, Jiawei and Pan, Liang and Wu, Wayne and Yang, Lei and Wang, Jiaqi and Qian, Chen and others},
  booktitle={Proceedings of the IEEE/CVF Conference on Computer Vision and Pattern Recognition},
  pages={803--814},
  year={2023}
}

We're very grateful to the codebase of Legged Gym (https://github.com/leggedrobotics/legged_gym).

📄 License

This work is under the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.