Dataset of 2D polygons for Additive Manufacturing

The following repository is linked to the article entitled: "Generation of continuous hybrid zig-zag and contour paths for 3D printing". As described in the article, the repository contains a dataset of 15 convex polygons and 20 non-convex polygons in order to validate the methods described in the article. Please cite this paper in your publications if this dataset helps your research: Gomez, G., Cortés, C., Creus, C. et al. Generation of continuous hybrid zig-zag and contour paths for 3D printing. Int J Adv Manuf Technol 119, 7025–7040 (2022). [https://doi.org/10.1007/s00170-021-08418-z]

Repository structure

• Polygons: the folder contains 2 folders with the coordinates of 35 2D polygons (15 convex and 20 non-convex) in .json files.

  • ConvexPolygons: Folder containing the .json files with the coordinates of 15 convex polygons.
  • NonConvexPolygons: Folder containing the .json files with the coordinates of 20 non-convex polygons.
    The structure of each .json file is as follows:

   [{"boundary":
  [[X1, Y1],
   [X2, Y2],
   [X3, Y3],
      .
      .
      .
   [Xi, Yi],
      .
      .
      .
   [Xn, Yn],
  "children":
  [{"boundary":
     [[x1, y1],
      [x2, y2],
      [x3, y3],
         .
         .
         .
      [xi, yi],
         .
         .
         .
      [xn, yn]}]}]
  

• InfillPaths: the folder contains 2 folders with some possible infills for each polygon.

  • ConvexPolygons: Folder containing the .txt files with the infills of 15 convex polygons.
  • NonConvexPolygons: Folder containing the .txt files with the infills of 20 non-convex polygons.
    Each .txt file contains 48 infills for a polygon varying lines separation and orientation, except NCPolygon20.txt which only has one infill. The structure of the .txt files is as follows:

   Separation 1: S1, Separation 2: S2, Angle: A, Keep original separations: Yes/No
   X: X1 Y: Y1
   X: X2 Y: Y2
   X: X3 Y: Y3
        .
        .
        .
   X: Xi Y: Yi
        .
        .
        .
   X: Xn Y: Yn
   Separation 1: S1', Separation 2: S2', Angle: A', Keep original separations: Yes/No
   X: X1' Y: Y1'
   X: X2' Y: Y2'
   X: X3' Y: Y3'
         .
         .
         .
   X: Xi' Y: Yi'
         .
         .
         .
   X: Xn' Y: Yn'
         .
         .
         .
  

  If Keep original separations is Yes, the chosen separations remain fix, while if it is No, the separations were automatically adjusted to ensure that all the convex (sub)polygons were completely filled.

• PythonCode: the folder contains 5 .py files to plot the polygons and the generated infills.

  • loadPolygon.py: this file has the functions needed to load the polygon and split it into polygons of maximum depth 2.
  • loadTxt.py: this file has the functions needed to load the infills generated for a polygon.
  • plotPolygon.py: this file has the functions needed to plot the polygon.
  • plotInfill.py: this file has the functions needed to plot the infill generated for a polygon. The function plotInfill shows the final infill completely at once. The function plotInfillSegment2Segment shows the segments of the infill in the order the printer would print.
  • main.py: this file plots a polygon and all the infills generated for it. By default plotInfill function is executed, but one can easily execute plotInfillSegment2Segment by uncommenting the line in which is called.

  Python dependencies: numpy, pyplot (matplotlib)

• PolygonsAppearanceAndRelevance: .pdf file that contains a picture of each polygon, a picture of a possible infill for each polygon and a brief sentence explaining why the polygon is relevant for the work.

Polygon visualization

The code to visualize the polygons and their infills is to be executed in Python3. The input arguments should be:

1. .json file.
2. .txt file.
3. (optional) the index of the infill to be plotted. In case it is empty, the 48 possible infills will be shown.

Example of usage:

python3 main.py ../Polygons/ConvexPolygons/CPolygon1.json ../InfillPaths/ConvexPolygons/Cpolygon1.txt 10

License

The resources in this repository are licensed under the Creative Commons Attribution-ShareAlike 3.0 Spain License. To view a copy of this license, visit http://creativecommons.org/licenses/by-sa/3.0/es/ or send a letter to Creative Commons, PO Box 1866, Mountain View, CA 94042, USA.

Contact

If you have any question or suggestion, do not hesitate to contact us at the following addresses:

• Maialen Zelaia: [email protected]
• Camilo Cortés: [email protected]
• Aitor Moreno: [email protected]