<img src='docs/images/lizard2.gif' align="right" width=325>
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# Point2Mesh in PyTorch


### SIGGRAPH 2020 [[Paper]](https://arxiv.org/abs/2005.11084) [[Project Page]](https://ranahanocka.github.io/point2mesh/)<br>

Point2Mesh is a technique for reconstructing a surface mesh from an input point cloud.
This approach "learns" from a single object, by optimizing the weights of a CNN to deform some initial mesh to shrink-wrap the input point cloud.
The argument for going this route is: since the (local) convolutional kernels are optimized globally across the entire shape,
this encourages local-scale geometric self-similarity across the reconstructed shape surface.

<img src="docs/images/global_anky.gif" align="center" width="250px"> <br>

The code was written by [Rana Hanocka](https://www.cs.tau.ac.il/~hanocka/) and [Gal Metzer](https://www.linkedin.com/in/gal-metzer-512803a1/).

# Getting Started

### Installation
- Clone this repo:
```bash
git clone https://github.com/ranahanocka/point2mesh.git
cd point2mesh
```
#### Setup Conda Environment
- Relies on [PyTorch](https://pytorch.org/) version 1.4 (or 1.5) and [PyTorch3D](https://github.com/facebookresearch/pytorch3d) version 0.2.0. <br>
Install via conda environment `conda env create -f environment.yml` (creates an environment called point2mesh)

#### Install "Manifold" Software
This code relies on the [Robust Watertight Manifold Software](https://github.com/hjwdzh/Manifold). 
First ```cd``` into the location you wish to install the software. For example, we used ```cd ~/code```.
Then follow the installation instructions in the Watertight README.
If you installed Manifold in a different path than ```~/code/Manifold/build```, please update ```options.py``` accordingly (see [this line](https://github.com/ranahanocka/point2mesh/blob/767ac0ea0f5297b912eafd61a5cd2f60ec8c8490/options.py#L6))
  
# Running Examples
 
### Get Data
Download our example data
```bash
bash ./scripts/get_data.sh
```

### Running Reconstruction 
First, if using conda env first activate env e.g. ```source activate point2mesh```.
All the scripts can be found in ```./scripts/examples```.
Here are a few examples:

#### Giraffe
```bash
bash ./scripts/examples/giraffe.sh
```

#### Bull
```bash
bash ./scripts/examples/bull.sh
```

#### Tiki
```bash
bash ./scripts/examples/tiki.sh
```

#### Noisy Guitar
```bash
bash ./scripts/examples/noisy_guitar.sh
```
... and more.
#### All the examples
To run all the examples in this repo:
```bash
bash ./scripts/run_all_examples.sh
```
# Running different Examples
You should provide an initial mesh file. If the shape has genus 0, you can use the convex hull script provided in ```./scripts/process_data/convex_hull.py```

# Citation
If you find this code useful, please consider citing our paper
```
@article{Hanocka2020p2m,
  title = {Point2Mesh: A Self-Prior for Deformable Meshes},
  author = {Hanocka, Rana and Metzer, Gal and Giryes, Raja and Cohen-Or, Daniel},
  year = {2020},
  issue_date = {July 2020}, 
  publisher = {Association for Computing Machinery}, 
  volume = {39}, 
  number = {4}, 
  issn = {0730-0301},
  url = {https://doi.org/10.1145/3386569.3392415},
  doi = {10.1145/3386569.3392415},
  journal = {ACM Trans. Graph.}, 
}
```

# Questions / Issues
If you have questions or issues running this code, please open an issue.