Rip-NeRF

Official PyTorch implementation of the paper:

Rip-NeRF: Anti-aliasing Radiance Fields with Ripmap-Encoded Platonic Solids

SIGGRAPH 2024

Junchen Liu*, Wenbo Hu*, Zhuo Yang*, Jianteng Chen, Guoliang Wang, Xiaoxue Chen, Yantong Cai, Huang-ang Gao, Hao Zhao

> To render a pixel, we first cast a cone for each pixel, and then divide the cone into multiple conical frustums, which are further characterized by anisotropic 3D Gaussians parameterized by their mean and covariance (𝝁, 𝚺). Next, to featurize a 3D Gaussian, we project it onto the unparalleled faces of the Platonic solid to form a 2D Gaussian (𝝁_proj, 𝚺_proj), while the Platonic solid's faces are represented by the Ripmap Encoding with learnable parameters. Subsequently, we perform tetra-linear interpolation on the Ripmap Encoding to query corresponding feature vectors for the 2D Gaussian, where the position and level used in the interpolation are determined by the mean and covariance of the 2D Gaussian, respectively. Finally, feature vectors from all Platonic solids' faces and the encoded view direction are aggregated together to estimate the color and density of the conical frustums by a tiny MLP.

> Qualitative and quantitative results of our Rip-NeRF and several representative baseline methods, e.g. Zip-NeRF, Tri-MipRF, etc. Rip-NeRF_25k is a variant of Rip-NeRF that reduces the training iterations from 120𝑘 to 25𝑘 for better efficiency. The first and second rows in the left panel are results from the multi-scale Blender dataset and our newly captured real-world dataset, respectively. Our Rip-NeRF can render high-fidelity and aliasing-free images from novel viewpoints while maintaining efficiency.

Installation

We use Python 3.9. Please install the following dependencies first

• PyTorch (1.13.1 + cu11.6)
• tiny-cuda-nn

And then install the following dependencies using pip

pip3 install absl-py \
    gin-config==0.5.0 \
    loguru==0.6.0 \
    matplotlib \
    nerfacc==0.3.5 \
    numpy==1.23.3 \
    open3d==0.16.0 \
    opencv-python==4.6.0.66 \
    Pillow==9.2.0 \
    rich==12.6.0 \
    tensorboardX \
    termcolor \
    torchmetrics==0.10.0 \
    torchmetrics[image] \
    torchtyping==0.1.4 \
    tqdm==4.64.1

Data

nerf_synthetic dataset

Please download and unzip nerf_synthetic.zip from the NeRF official Google Drive.

Generate multiscale dataset

Please generate it by

python scripts/convert_blender_data.py --blenderdir /path/to/nerf_synthetic --outdir /path/to/nerf_synthetic_multiscale

Training and evaluation

python main.py --ginc config_files/ms_blender.gin 

Citation

If you find the code useful for your work, please star this repo and consider citing:

@inproceedings{liu2024ripnerf,
    title={Rip-NeRF: Anti-aliasing Radiance Fields with Ripmap-Encoded Platonic Solids},
    author={Liu, Junchen and Hu, Wenbo and Yang, Zhuo and Chen, Jianteng and Wang, Guoliang and Chen, Xiaoxue and Cai, Yantong and Gao, Huan-ang and Zhao, Hao},
    year={2024},
    booktitle={SIGGRAPH'24 Conference Proceedings},
}

Related Work

• Mip-NeRF (ICCV 2021)
• Instant-ngp (SIGGRAPH 2022)
• Tri-MipRF (ICCV 2023)
• Zip-NeRF (ICCV 2023)