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Polygon Formats

When polygons have "holes", "islands" or "cutouts" there are a number of ways to represent this information since GDSII has no concept of holes inside of boundaries.

methods of implementing polygons with holes.

Most downstream GDSII applications don't understand Embedding Level or Leonov so only use those options when you know your target understands the meaning of the sub layers.

PG Compatible - if checked, makes the output polygons compatible with a pattern generator (which uses two pairs of shutter blades mounted on a rotating head - essentially can print rotated rectangles. This output avoids acute angles which the PG head cannot print.)

A pattern generator head can print rectangles at any orientation but cannot print acute angles.