LightGaussian: Unbounded 3D Gaussian Compression with 15x Reduction and 200+ FPS

User Guidance

Gaussian Prune Ratio, Vector Quantization Ratio vs. FPS, SSIM

Mild Compression Ratio, with Minimum Accuracy Degradation

Setup

Local Setup

The codebase is based on gaussian-splatting

The used datasets, MipNeRF360 and Tank & Temple, are hosted by the paper authors here.

For installation:

conda env create --file environment.yml
conda activate lightgaussian

note: we modified the "diff-gaussian-rasterization" in the submodule to get the Global Significant Score.

Compress to Compact Representation

Lightgaussian includes 3 ways to make the 3D Gaussians be compact

Option 1 Prune & Recovery

Users can directly prune a trained 3D-GS checkpoint using the following command (default setting):

bash scripts/run_prune_finetune.sh

Users can also train from scratch and jointly prune redundant Gaussians in training using the following command (different setting from the paper):

bash scripts/run_train_densify_prune.sh

note: 3D-GS is trained for 20,000 iterations and then prune it. The resulting ply file is approximately 35% of the size of the original 3D-GS while ensuring a comparable quality level.

Option 2 SH distillation

Users can distill 3D-GS checkpoint using the following command (default setting):

bash scripts/run_distill_finetune.sh

Option 3 VecTree Quantization

Users can quantize a pruned and distilled 3D-GS checkpoint using the following command (default setting):

bash scripts/run_vectree_quantize.sh

Render

Render with trajectory. By default ellipse, you can change it to spiral or others trajectory by changing to corresponding function.

python render_video.py --source_path PATH/TO/DATASET --model_path PATH/TO/MODEL --skip_train --skip_test --video

For render after the Vectree Quantization stage, you could render them through

python render_video.py --load_vq

Example

An example ckpt for room scene can be downloaded here, which mainly includes the following several parts:

• point_cloud.ply —— Pruned, distilled and quantized 3D-GS checkpoint.
• extreme_saving —— Relevant files obtained after vectree quantization.
• imp_score.npz —— Global significance used in vectree quantization.

TODO List

• Upload module 1: Prune & recovery
• Upload module 2: SH distillation
• Upload module 3: Vectree Quantization
• Upload docker image

Acknowledgements

We would like to express our gratitude to Yueyu Hu from NYU for the invaluable discussion on our project.

BibTeX

If you find our work useful for your project, please consider citing the following paper.

@misc{fan2023lightgaussian, 
title={LightGaussian: Unbounded 3D Gaussian Compression with 15x Reduction and 200+ FPS}, 
author={Zhiwen Fan and Kevin Wang and Kairun Wen and Zehao Zhu and Dejia Xu and Zhangyang Wang}, 
year={2023},
eprint={2311.17245},
archivePrefix={arXiv},
primaryClass={cs.CV} }