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Filling Rules

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Even-Odd

Even-odd filling rule Regions with an odd winding number are filled. Three examples show contour directions, plus and minus contributions, and winding numbers along dashed guides.

Non-Zero

Non-zero filling rule Regions with a non-zero winding number are filled. Three examples show contour directions, plus and minus contributions, and winding numbers along dashed guides.

Positive

Positive filling rule Regions with a positive winding number are filled. Three examples show contour directions, plus and minus contributions, and winding numbers along dashed guides.

Negative

Negative filling rule Regions with a negative winding number are filled. Three examples show contour directions, plus and minus contributions, and winding numbers along dashed guides.

Filling Rules:

  • Even-Odd: Only odd numbered sub-regions are filled
  • Non-Zero: Only non-zero sub-regions are filled
  • Positive: Only positive sub-regions are filled
  • Negative: Only negative sub-regions are filled