A fill (
Place » Fill) is a rectangular-shaped design object that can be placed on any layer, including copper (signal) layers. Fills are limited to a rectangular shape and will not avoid other objects, such as pads, vias, tracks, regions, other fills, or text. If a Fill is placed on a signal layer, it can be connected to a Net.
A region (
Place » Solid Region) is a design object that is used for defining polygonal shapes. A Solid Region (commonly called Region) can be placed on any layer including signal (copper) layers. Like a Fill, a Region does not avoid other objects, such as pads, vias, tracks, fills, other regions, or text. If a region is placed on a signal layer, it can be connected to a Net.
A region object has a number of special properties that allow it to be used for:
- Polygon cutouts - where it is essentially a negative (empty) object that the surrounding polygon pours around.
- Board shape cutouts - where it also acts as a negative (empty) object to define an irregular cutout or hole in the board.
- Custom pad shapes - where it defines the copper area of an unusual pad, giving the ability to define automatically matched-shape solder and paste mask contractions/expansions.
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