Trim 3D Gaussian Splatting for Accurate Geometry Representation

More demonstrations can be found on our project page and arXiv paper.

Updates

• [24-08-06] We support training Trim2DGS from scratch. The performances on DTU and MipNeRF360 are all improved compared to the results in the paper.
• [24-07-24] Trim2DGS is updated to support TnT dataset.
• [24-06-25] We release the demo video rendering scripts with Blender to show the mesh.
• [24-06-20] The code of Trim2DGS is released. We have made Trim3DGS and Trim2DGS compatible in a shared environment for easier use! If you have installed trim3dgs environment following the older instruction, please remove it and reinstall the new environment trimgs.
• [24-06-18] The code of Trim3DGS is released.

Installation

git clone git@github.com:YuxueYang1204/TrimGS.git --recursive
# Here we comment out the pip install Trim2DGS/submodules/simple-knn in environment.yml, since it is the same as the one in Trim3DGS
conda env create -f environment.yml
conda activate trimgs

Note: We modify the differentiable rasterization kernel to support contribution-based trimming, which can be found in diff-gaussian-rasterization (for Trim3DGS) and diff-surfel-rasterization (for Trim2DGS).

Dataset Preparation

DTU

For geometry reconstruction on DTU dataset, please download the preprocessed data (only dtu.tar.gz is needed). You also need to download the ground truth DTU point cloud SampleSet.zip and Points.zip from the DTU official website.

mkdir data && cd data
mkdir dtu_dataset
# prepare the dtu dataset
tar -xvf dtu.tar.gz -C dtu_dataset
# prepare the ground truth
unzip SampleSet.zip
# remove the incomplete points and unzip the complete points
rm -r SampleSet/MVS\ Data/Points
unzip Points.zip -d SampleSet/MVS\ Data
mv SampleSet/MVS\ Data dtu_dataset/Official_DTU_Dataset

MipNeRF360

For novel view synthesis on MipNeRF360, please download the 360_v2.zip and 360_extra_scenes.zip from MipNeRF360.

cd data
mkdir MipNeRF360
unzip 360_v2.zip -d MipNeRF360
unzip 360_extra_scenes.zip -d MipNeRF360

TnT

For geometry reconstruction on TnT dataset, please download the preprocessed TnT_data. You also need to download the ground truth Results on training set.

cd data
unzip TNT_GOF.zip
unzip trainingdata.zip -d TNT_GOF/ground_truth

Due to the requirement conflict of open3d, we need to create a new environment for TnT evaluation:

conda create -n tnt_eval python=3.8 -y
conda activate tnt_eval
pip install open3d==0.10
pip install trimesh

Now the data folder should look like this:

data
├── dtu_dataset
│   ├── DTU
│   │   ├── scan24
│   │   ├── ...
│   │   └── scan122
│   └── Official_DTU_Dataset
│       ├── Points
│       │   └── stl
│       └── ObsMask
├── MipNeRF360
│   ├── bicycle
│   └── ...
└── TNT_GOF
    ├── ground_truth
    │   ├── Barn
    │   └── ...
    └── TrainingSet
        ├── Barn
        └── ...

Then link the data folder to the Trim3DGS and Trim2DGS:

ln -s data Trim3DGS/data
ln -s data Trim2DGS/data

Training and Evaluation

Trim3DGS

cd Trim3DGS
# train DTU dataset
python scripts/run_dtu.py
# print the evaluation results
python print_results.py -o output/DTU_Trim3DGS --dataset dtu
# the extracted mesh of DTU dataset can be found in `output/DTU_Trim3DGS/scan${scene_id}/tsdf/ours_7000/mesh_post.ply`

# MiNeRF360
python scripts/run_Mipnerf360.py
# print the evaluation results
python print_results.py -o output/MipNeRF360_Trim3DGS --dataset mipnerf360

Trim2DGS

cd Trim2DGS
# DTU dataset
# train 2DGS 30K and finetune Trim2DGS 7K
python scripts/run_dtu.py
# or you can train Trim2DGS from scratch
python Trim2DGS/scripts/train_from_scratch/run_dtu.py
# print the evaluation results
python print_results.py -o output/DTU_Trim2DGS --dataset dtu
# the extracted mesh of DTU dataset can be found in `output/DTU_Trim2DGS/scan${scene_id}/train/ours_7000/fuse_post.ply`

# MiNeRF360
# train 2DGS 30K and finetune Trim2DGS 7K
python scripts/run_Mipnerf360.py
# or you can train Trim2DGS from scratch
python Trim2DGS/scripts/train_from_scratch/run_Mipnerf360.py
# print the evaluation results
python print_results.py -o output/MipNeRF360_Trim2DGS --dataset mipnerf360

# TnT
python scripts/run_TNT.py
# evaluate the results
conda activate tnt_eval
python scripts/eval_TNT.py
python print_results.py -o output/TNT_Trim2DGS --dataset tnt

---

We provide the meshes of DTU dataset from Trim3DGS and Trim2DGS for evaluation.

Thank hbb1 for his kind suggestion on Trim2DGS in #1, resulting in a better performance.

Table Results

Chamfer distance on DTU dataset (lower is better)

	24	37	40	55	63	65	69	83	97	105	106	110	114	118	122	Mean
2DGS (Paper)	0.48	0.91	0.39	0.39	1.01	0.83	0.81	1.36	1.27	0.76	0.70	1.40	0.40	0.76	0.52	0.80
2DGS (Reproduce)	0.46	0.80	0.33	0.37	0.95	0.86	0.80	1.25	1.24	0.67	0.67	1.24	0.39	0.64	0.47	0.74
Trim2DGS (Paper)	0.48	0.82	0.44	0.45	0.95	0.75	0.74	1.18	1.13	0.72	0.70	0.99	0.42	0.62	0.50	0.72
Trim2DGS (Reproduce)	0.45	0.72	0.33	0.40	0.97	0.72	0.73	1.21	1.14	0.61	0.67	1.01	0.41	0.60	0.44	0.69

We provide geometry evaluation results of Trim2DGS on TnT dataset test-set.

Table Results

F1 scores on TnT dataset (higher is better)

	Barn	Caterpillar	Ignatius	Truck	Meetingroom	Courthouse	Mean
2DGS	0.30	0.25	0.54	0.50	0.19	0.13	0.32
Trim2DGS	0.31	0.30	0.61	0.56	0.20	0.18	0.36

Todo

• Release the code of Trim3DGS.
• Release the code of Trim2DGS.
• Release scripts for making demo videos.
• Support TnT dataset.
• Integrate TrimGS into more methods such as GOF.

Acknowledgements

We sincerely thank the authors of the great works 3D Gaussian Splatting and 2D Gaussian Splatting. Our Trim3DGS and Trim2DGS are built upon these foundations.

The running scripts are adapted from GOF and the evaluation scripts for DTU and Tanks and Temples dataset are taken from DTUeval-python and TanksAndTemples respectively.

We thank all the authors for their great work and repos.

Citation

Please consider citing our work as follows if it is helpful.

@article{fan2024trim,
  author    = {Fan, Lue and Yang, Yuxue and Li, Minxing and Li, Hongsheng and Zhang, Zhaoxiang},
  title     = {Trim 3D Gaussian Splatting for Accurate Geometry Representation},
  journal   = {arXiv preprint arXiv:2406.07499},
  year      = {2024},
}