Hole Detection

Requirements

Install the necessary packages:

pip install numpy
pip install open3d

Usage Instructions

1. Enter the path of your triangle mesh in config.yml.
2. Execute main_hole_detection.py.
3. The detected boundaries and holes will be saved as a JSON file in the current directory.
4. Utilize main_visualizer.py to display the detected boundaries and holes.

Sample Data

The provided sample is a modified version of the Open3D Stanford bunny mesh.

For a detailed description of the method, visit this link.

Explanation of the result_boundaries_and_holes.json

It contains [ Region1, Region2, ...]

For each region, we have

continent:[ ? x 3] (triangle indices)  
coastline:  
| - indices:  [vertices indices]  
| - locations:[? x 3] (x, y, z)  
| - normals:  [? x 3] (n_x, n_y, n_x) (Estimated normals)  
tide:  
| - 0  
|   | - indices:  [vertices indices]  
|   | - locations:[? x 3] (x, y, z)  
|   | - normals:  [? x 3] (n_x, n_y, n_x) (Estimated normals)  
|  
.  
.  
.  
| - ?  
   | - indices:  [vertices indices]  
   | - locations:[? x 3] (x, y, z)  
   | - normals:  [? x 3] (n_x, n_y, n_x) (Estimated normals)  
lake:  
| - 0  
|   | - indices:  [vertices indices]  
|   | - locations:[? x 3] (x, y, z)  
|   | - normals:  [? x 3] (n_x, n_y, n_x) (Estimated normals)  
|  
.  
.  
.  
| - ?  
    | - indices:  [vertices indices]  
    | - locations:[? x 3] (x, y, z)  
    | - normals:  [? x 3] (n_x, n_y, n_x) (Estimated normals)  

It shares the global coordinate as your triangle mesh.

Known Issue

A bug has been identified when extracting boundary edges from stl files using Open3D. To circumvent this, please convert stl files to ply format using Blender, and then proceed with our implementation for loading ply files.