3D-CODED [Project Page] [Paper] [Talk] + Learning Elementary Structure [Project Page] [Paper] [Code]

3D-CODED : 3D Correspondences by Deep Deformation
Thibault Groueix, Matthew Fisher, Vladimir G. Kim , Bryan C. Russell, Mathieu Aubry
In ECCV, 2018.

Learning elementary structures for 3D shape generation and matching
Theo Deprelle, Thibault Groueix, Matthew Fisher, Vladimir G. Kim , Bryan C. Russell, Mathieu Aubry
In Neurips, 2019. Official Code

A note on data.

Data download should be automatic. However, due to the new google drive traffic caps, you may have to download manually. If you run into an error during the data download, you can refer to ThibaultGROUEIX/AtlasNet#61.

You can manually download the data from these sources :

• Google drive datas_surreal_test.pth: https://drive.google.com/file/d/1VGax9j64AvCVORtiQ3ZSPecI0bfZrEVe/view?usp=sharing
• Google drive datas_surreal_train.pth: https://drive.google.com/file/d/1HVReM43YtJqhGfbmE58dc1-edI_oz9YG/view?usp=sharing

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Learned templates

Faust results

Method	L2 Train SURREAL	L2 Val SURREAL	Faust Intra results	Faust Inter results
3D-CODED	1.098	1.315	1.747	2.641
Points Translation 3D	9.980	1.263	1.626	2.714
Patch Deformation 3D	1.028	1.436	1.742	2.578
Points Translation + Patch Deformation 3D	0.969	1.173	1.676	2.779
Points Translation 2D	1.09	1.54	2.054	3.005
Patch Deformation 2D	6.354	6.767	4.46	5.420
Points Translation 10D	0.906	1.064	1.799	2.707
Patch Deformation 10D	0.952	1.183	1.683	2.83

Sample results

Input : 2 meshes
Task : put them in point-wise correspondence. (suggested by color)

Install 👷 [Pytorch, Conda]

This implementation uses Pytorch.

git clone https://github.com/ThibaultGROUEIX/3D-CODED.git ## Download the repo
cd 3D-CODED; git submodule update --init
conda env create -f 3D-CODED-ENV.yml ## Create python env
source activate pytorch-3D-CODED
pip install http://imagine.enpc.fr/~langloip/data/pymesh2-0.2.1-cp37-cp37m-linux_x86_64.whl
cd extension; python setup.py install; cd ..

Demo 🚆 and Inference Trained Models

python inference/correspondences.py --dir_name learning_elementary_structure_trained_models/1patch_deformation

This script takes as input 2 meshes from data and compute correspondences in results. Reconstruction are saved in dir_name.

Options (Usually default parameters are good)

# Key parameters
'--dir_name', type=str, default="",  help='dirname')
'--inputA', type=str, default =  "data/example_0.ply",  help='your path to mesh 0'
'--inputB', type=str, default =  "data/example_1.ply",  help='your path to mesh 1'

# Secondary parameters
'--HR', type=int, default=1, help='Use high Resolution template for better precision in the nearest neighbor step ?'
'--reg_num_steps', type=int, default=3000, help='number of epochs to train for during the regression step'
'--num_points', type=int, default = 6890,  help='number of points fed to poitnet'
'--num_angles', type=int, default = 100,  help='number of angle in the search of optimal reconstruction. Set to 1, if you mesh are already facing the cannonical 				direction as in data/example_1.ply'
'--env', type=str, default="CODED", help='visdom environment'
'--clean', type=int, default=0, help='if 1, remove points that dont belong to any edges'
'--scale', type=int, default=0, help='if 1, scale input mesh to have same volume as the template'
'--project_on_target', type=int, default=0, help='if 1, projects predicted correspondences point on target mesh'
'--randomize', type=int, default=0, help='if 1, projects predicted correspondences point on target mesh'
'--LR_input', type=int, default=1, help='Use Low Resolution Input '

Results

• Initial guesses for example0 and example1:

• Final reconstruction for example0 and example1:

On your own meshes

You need to make sure your meshes are preprocessed correctly :

• The meshes are loaded with Trimesh, which should support a bunch of formats, but I only tested .ply files. Good converters include Assimp and Pymesh.

• The trunk axis is the Y axis (visualize your mesh against the mesh in data to make sure they are normalized in the same way).

• the scale should be about 1.7 for a standing human (meaning the unit for the point cloud is the m). You can automatically scale them with the flag --scale 1

--> Failure modes instruction : ⚠️

• Sometimes the reconstruction is flipped, which break the correspondences. In the easiest case where you meshes are registered in the same orientation, you can just fix this angle in correspondence.py line 240, to avoid the flipping problem. Also note from this line that the angle search only looks in [-90°,+90°].

• Check the presence of lonely outliers that break the Pointnet encoder. You could try to remove them with the --clean flag.

FAUST

• If you want to use inference/correspondences.py to process a hole dataset, like FAUST test set, you can use ./inference/script.py, for the FAUST inter challenge. Good luck :-)

Training

python ./training/train.py

Trainer's Options

'--point_translation', type=int, default=0, help='point_translation'
'--dim_template', type=int, default=3, help='dim_template'
'--patch_deformation', type=int, default=0, help='patch_deformation'
'--dim_out_patch', type=int, default=3, help='dim_out_patch'
'--start_from', type=str, default="TEMPLATE", choices=["TEMPLATE, SOUP, TRAINDATA"] ,help='dim_out_patch'

Monitor your training on http://localhost:8888/

Note on data preprocessing

The generation process of the dataset is quite heavy so we provide our processed data. Should you want to reproduce the preprocessing, go to data/README.md. Brace yourselve :-)

Reproduce the paper 🚆

python script/launch.py --mode training #Launch 4 trainings with different parameters.
python script/launch.py --mode inference #Eval the 4 pre-trained models.

Citing this work

If you find this work useful in your research, please consider citing:

@inproceedings{deprelle2019learning,
  			title={Learning elementary structures for 3D shape generation and matching},
  			author={Deprelle, Theo and Groueix, Thibault and Fisher, Matthew and Kim, Vladimir G and Russell, Bryan C and Aubry, Mathieu},
  			booktitle={Neurips},
  			year={2019}
}

@inproceedings{groueix2018b,
          title = {3D-CODED : 3D Correspondences by Deep Deformation},
          author={Groueix, Thibault and Fisher, Matthew and Kim, Vladimir G. and Russell, Bryan and Aubry, Mathieu},
          booktitle = {ECCV},
          year = {2018}
        }

License

MIT

Cool Contributions

• Zhongshi Jiang applying trained model on a monster model 👹 (left: original , right: reconstruction)

Acknowledgement

• The code for the Chamfer Loss was adapted from Fei Xia'a repo : PointGan. Many thanks to him !
• The code for the Laplacian regularization comes from Angjoo Kanazawa and Shubham Tulsiani. This was so helpful, thanks !
• Part of the SMPL parameters used in the training data comes from Gül Varol's repo : https://github.com/gulvarol/surreal But most of all, thanks for all the advices :)
• The FAUST Team for their prompt reaction in resolving a benchmark issue the week of the deadline, especially to Federica Bogo and Jonathan Williams.
• The efficient code for to compute geodesic errors comes from https://github.com/zorah/KernelMatching. Thanks!
• The SMAL team, and SCAPE team for their help in generating the training data.
• DeepFunctional Maps authors for their fast reply the week of the rebuttal ! Many thanks.
• Hiroharu Kato for his very clean neural renderer code, that I used for the gifs :-)
• Pytorch developpers for making DL code so easy.
• This work was funded by Ecole Doctorale MSTIC. Thanks !
• And last but not least, my great co-authors : Theo Deprelle, Matthew Fisher, Vladimir G. Kim, Bryan C. Russell, and Mathieu Aubry