AniSDF: Fused-Granularity Neural Surfaces with Anisotropic Encoding for High-Fidelity 3D Reconstruction,
Jingnan Gao, Zhuo Chen, Xiaokang Yang, Yichao Yan
Shanghai Jiao Tong University
ICLR 2025

Official implementation of "AniSDF: Fused-Granularity Neural Surfaces with Anisotropic Encoding for High-Fidelity 3D Reconstruction".

• To utilize multiresolution hash encoding or fully fused networks provided by tiny-cuda-nn, you should have at least an RTX 2080Ti, see https://github.com/NVlabs/tiny-cuda-nn#requirements for more details.
• To obtain the best results, an Tesla V100 is highly recommended, though most scenes can be recontructed using an RTX 3090.
• Multi-GPU training is currently not supported on Windows.

• Install PyTorch>=1.10 here based the package management tool you used and your cuda version (older PyTorch versions may work but have not been tested)
• Install tiny-cuda-nn PyTorch extension: pip install git+https://github.com/NVlabs/tiny-cuda-nn/#subdirectory=bindings/torch
• pip install -r requirements.txt

• Download the NeRF-Synthetic data here and put it under load/. The file structure should be like load/nerf_synthetic/lego.
• Download the Shiny-Blender data here and put it under load/. The file structure should be like load/refnerf/helmet.
• Download the Shelly data here and put it under load/. The file structure should be like load/shelly_dataset/khady.
• Download the MipNeRF360 data here and put it under load/. The file structure should be like load/360_v2/bicycle.

Run the launch script with --train, specifying the config file, the GPU(s) to be used (GPU 0 will be used by default), and the scene name:

python launch.py --config configs/anisdf-nerf.yaml --gpu 0 --train dataset.scene=lego tag=example

The code snapshots, checkpoints and experiment outputs are saved to exp/[name]/[tag]@[timestamp], and tensorboard logs can be found at runs/[name]/[tag]@[timestamp]. You can change any configuration in the YAML file by specifying arguments without --, for example:

python launch.py --config configs/anisdf-nerf.yaml --gpu 0 --train dataset.scene=lego tag=iter50k seed=0 trainer.max_steps=50000

To get COLMAP data from custom images, you should have COLMAP installed (see here for installation instructions). Then put your images in the images/ folder, and run scripts/imgs2poses.py specifying the path containing the images/ folder. For example:

python scripts/imgs2poses.py ./load/bmvs_dog # images are in ./load/bmvs_dog/images

Existing data following this file structure also works as long as images are store in images/ and there is a sparse/ folder for the COLMAP output, for example the data provided by MipNeRF 360. An optional masks/ folder could be provided for object mask supervision. To train on COLMAP data, please refer to the example config files config/*-colmap.yaml. Some notes:

• Adapt the root_dir and img_wh (or img_downscale) option in the config file to your data;
• The scene is normalized so that cameras have a minimum distance 1.0 to the center of the scene. Setting model.radius=1.0 works in most cases. If not, try setting a smaller radius that wraps tightly to your foreground object.
• There are three choices to determine the scene center: dataset.center_est_method=camera uses the center of all camera positions as the scene center; dataset.center_est_method=lookat assumes the cameras are looking at the same point and calculates an approximate look-at point as the scene center; dataset.center_est_method=point uses the center of all points (reconstructed by COLMAP) that are bounded by cameras as the scene center. Please choose an appropriate method according to your capture.

• Some thoughts on experiments would be updated here.

The training procedure are by default followed by testing, which computes metrics on test data, generates animations and exports the geometry as triangular meshes. If you want to do testing alone, just resume the pretrained model and replace --train with --test, for example:

python launch.py --config path/to/your/exp/config/parsed.yaml --resume path/to/your/exp/ckpt/ --gpu 0 --test

@inproceedings{gao2025anisdf,
  title={AniSDF: Fused-Granularity Neural Surfaces with Anisotropic Encoding for High-Fidelity 3D Reconstruction}, 
  author={Jingnan Gao and Zhuo Chen and Xiaokang Yang and Yichao Yan},
  journal={ICLR},
  year={2025},
}

Thanks to Yuanchen Guo for his excellent pipeline instant-nsr-pl. The codebase of AniSDF is built upon this wonderful project.