Convert Quasi-Circles

Detects polygons that approximate circles and replaces them with true circle primitives.

When to Use

• After importing from formats that represent circles as polygons (e.g., GDSII boundaries)
• To reduce vertex count and improve output quality
• Before exporting to formats with native circle support (DXF, CIF)

Options

Option	Description	Default
Tolerance	Maximum deviation from a perfect circle	1%
Minimum vertices	Minimum polygon vertex count to consider	8
Selected layers only	Apply to selected layers instead of all	Off

How It Works

1. Identifies polygons whose vertices all lie within the tolerance of a best-fit circle
2. Replaces qualifying polygons with circle primitives
3. Non-qualifying polygons are left unchanged

Technical Notes

• The tolerance is relative to the circle radius
• Polygons with fewer vertices than the minimum are skipped (to avoid false matches on squares/hexagons)
• The resulting circles can be exported as native circles in DXF/CIF, or re-approximated as polygons for GDSII