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Islands

An island is a "hole" or a "cutout" surrounded by metal or dielectric body. 3Di uses the concept of a parent polygon followed by one or more children that act as cutouts.

Example

GEOM
EXTR 2 0.0 0.1
2DPG 4
0.0 0.0
3.0 0.0
3.0 3.0
0.0 3.0
2DPG 4
1.0 1.0
2.0 1.0
2.0 2.0
1.0 2.0
 

3Di extrusion


 

Syntax for Islands

Any extrusion with islands or cutouts will have a polygon count of 2 or more. The first polygon is, by definition, the parent and is treated as "dark." All subsequent polygons are children and cut away from the parent.

Rules

  • The parent polygon may not self intersect or self-touch.

  • A child polygon may not self intersect or self touch

  • child polygons may not touch or overlap the parent

  • child polygons may not touch or overlap each other.

  • a circle can be used as a parent or as a child